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DL4EAI Germany flag Germany

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Ham Member Lookups: 7235


Last Update: 16. June 2017 

A brief look into my shack

Contens of this Homepage of DL4EAI

Topic   o:  My HAM Bio 
Topic   1:  My Recent Actvities
Topic   2:  My Photographer Bio    My Macro Stands Studio Concept with sample images of my 2nd hobby
Topic   3:  My Amateur Radio Station

Topic   4:  Antenna configuration and switching system for the remote base station of DL4EAI
Topic   5:  General information to public remote services and tips how to get access to remote base stations 
Topic   6:  Online user guide giving tips how you can accessing my IC-7400 transceiver via Internet by RemoteHams.com
Topic   7:  Tips to Amateur Radio enthusiasts, who intend to set up a remote based station

Topic   8:  WSPR preface information
Topic   9:  WSPRnet.org information's

Topic 10:  Echolink Gateway   DL4EAI-L

Topic 0
                                                                           HAM-Radio is not just a hobby,   it's a way of life

In Brief:  License  (Callsign) Since
1966: SWL  approved by ...  DARC         
1972: VHF / UHF HAM  ...... DC3EQ 
1981: HF / CW HAM      ...    DL4EAI       CW 12 WPM                     

2004: EchoLink Gateway ....DM0ZAA-L  discontinued
2013: Remote Base Station DL4EAI 
        in service             

Thanks for reading this information and taking interest to find out a little about myself and my hobbies. My name is Rüdiger (Rudi). As a young boy, I developed an interest in electronics through an friend of mine at the age of 11, and obtained my first detector receiver. And later on, I got started in radio (SWL) as a root of my hobby, by listening to the AM broadcast bands back in the 1970s. 

My interest for Ham-Radio (HAM) started when I was 16 years old. By the age of 17 in 1966 I acquired my shortwave radio listening (SWL) license by DARC. I was proud using a BC-348 military receiver in the 70s which I had got from a licensed friend. At an age of 23 I received my C Class license for VHF/UHF and higher frequencies and a few years later I acquired my CW Extra A Class, full licence. 

I live downtown in the city of Düsseldorf (JO31je) 40 m meters above sea-level, which is located east of the border of Netherland and Belgium on Germany's largest river Rhine in North Rhine-Westphalia. My Amateur hobby and Toolmaker apprenticeship led me to the University of Wuppertal, Germany followed to an engineeing career in electronics.

A remark on Düsseldorf. As mentioned, I am living in the city of Düsseldorf
, which I call it "the largest village in Germany". The translation disclosing why: (Düssel = Düssel is the name of our small city river and dorf = village). It's a beautiful international university city to life, which is surrounded by a village character.

Lifestyle   „Don’t worry, be happy“
Now : I`m 68 yrs. young and retired ham, sitting in my rocking chair and being happy, watching WSPR, enjoying HAM-Radio. To get moved, I’m active as photographer making nature and macro photos at home and on-site as well.

Visitor Highlights in our Garden
When I am not sitting in my rocking chair, perhaps I am sitting in our very quiet backyard garden in Düsseldorf, watching not only lovely chirping and warning birdies as one can see.



Topic 1
My Recent HAM Activities
                                               To be radioactive is a way to keep the doctor away!
Mainly digi modes

My favorite frequencies are from 10m up to 70cm. I'm also QRV on shortwave using my own remote base station IC-7400, which I am sharing to friends through RemoteHams (topic 5/6/7). I also enjoy and are predominantly QRV in digi mode like: weak signal·communications.
Welcome to the land of whispers. If you are registered at WSPR than look at my WSPRnet profile page here to observe my actual WSPR activities.

Amateur Radio enthusiasts, participants and listeners who are interested in the LF and MF bands will be familiar with WSPR. Used as a propagation probe or beacon. WSPR allows very weak signals to be detected, frequently as weak as -27dB SNR or lower.

WSPR TXing Test on 20m
WSPR is one of my passion mode. By aid of WSPR mode, I made an antenna distance and performance test checking my antenna propagation and its efficiency. Below is a brief sample of my WSPR TX distance test results reached with my Long-wire (52m) on 20m band on Feb. 2016 with 2 Watt only!

My latest WSPR online spots are shown here. Used antenna, see topic 8/9 and TRX see topic 7 below. I use WSPR beacons as a test tool for comparing various antennas, propagation studdy, locations, band spot openings when I am not in the shack and antenna performances in general.

  Relults: TXing only
WSPR provides a unique way to compare antenna systems in real-time and this automatically


Low band DXing    WSPR RXing Test on 2200m
My WSPR QRB (Distance) Test Made On LF

Timestamp Call MHz SNR Drift Grid Pwr Reporter RGrid km az
 2017-01-18 12:36   YL2GL   0.137396   -18   0   KO35gu   1   DL4EAI   JO31je   1399   257 
 2017-01-12 21:32   MM0HVU   0.137562   -12   0   IO85dv   5   DL4EAI   JO31je   868   123 
 2017-01-18 12:36   OK2SAM   0.137520   -11   0   JN99du   1   DL4EAI   JO31je   826   285 
 2017-01-13 21:22   2E0ILY   0.137551   -26   0   IO82qv   0.1   DL4EAI   JO31je   671   103 
 2017-01-12 21:32   G1CPC   0.137500   -9   0   IO91op   2   DL4EAI   JO31je   528   93 
 2017-01-12 21:32   G3ZER   0.137490   -14   0   IO91sp   0.5   DL4EAI   JO31je   505   93 
 2017-01-13 20:56   G0MRF   0.137525   -23   0   IO91tk   0.5   DL4EAI   JO31je   499   90 
 2017-01-12 21:32   DF4JH   0.137487   -21   0   JN68ep   5   DL4EAI   JO31je   489   307 
 2017-01-12 21:32   OZ7NV   0.137542   -5   0   JO44vv   5   DL4EAI   JO31je   458   207 
 2017-01-12 21:32   DL1FX   0.137522   -13   0   JN49   0.2   DL4EAI   JO31je   244   322 
 2017-01-09 14:58   PA3BHT   0.137496   -29   1   JO33li   0.5   DL4EAI   JO31je   241   183 
 2017-01-13 21:48   PA0A   0.137536   -15   0   JO33de   2   DL4EAI   JO31je   225   171 
 2017-01-12 21:32   PA0BRO   0.137534   -18   0   JO33hb   5   DL4EAI   JO31je   209   177 
 2017-01-12 21:32   PA3MRO   0.137430   -20   0   JO22oi   5   DL4EAI   JO31je   169   139 
 2017-01-09 22:58   DC0DX   0.137469   +6   0   JO31lk   0.01   DL4EAI   JO31je   30   203 
 2017-01-11 21:22   DF2JP   0.137423   -3   0   JO31hh   1   DL4EAI   JO31je   18   140 
 2017-01-14 16:10   DL4EAI   0.137449   +20   0   JO31je   0.001  DL4EAI-WIP   JO31je   0   0

Excellent Trans-Atlantic Sporadic-E Opening on 6m
Low band DX receiption    3 US and 1 JA station received on 6m in JT65 mode!


Fascinating slow speed CW experiment:
Low band DX receiption    My LF 137 kHz Band DXing Across The North Atlantic To Newfoundland (NA/EU)
Let's think in Hertz, not Kiloherz!

How I Have Reached on LF my First Unexpected Trans-Atlantic DX in RX QRSS Mode.
Information: Rüdiger, DL4EAI in western Germany received and decoded an QRSS60 transmission on 137.777 kHz sent by VO1NA in Newfoundland. QRSS is an extreme slow speed CW beacon transmission mode (see screenshots below).

Receiving a QRSS signal form Joe, VO1NA on 137 kHz by aid of DF2JP.
Due to the long term and high level experience on low band DXing of Joe DF2JP and utilizing his assistance getting started my 1st QRSS60 DX reception last night. Without my notice, Joe DF2JP informed Joe VO1NA in Newfoundland, Canada in parallel about my receiving test going on. 

WX difficulties in NA.
Although there was announced snow storm in Canada and his antennas were strongly covered by ice and snow. Fortunately, VO1NA has given it a short try and launched his outstanding LF transmitter and antenna farm system for a surprising test. In order to prevent harmful damage to the PA-Unit by the snow and ice covering the total antenna system, he decided to stop the test transmission after sending 2x his call in QRSS (slow speed CW).

Successful cooperation. 
Many thanks to Joe in Germany and Joe in Canada who especially helped me reaching my 1st long distance QRSS experiment executed at VF in only one night under extreme hard winter weather contitions taken place in Newfoundland!

Confirmed Trans-Atlantic ODX QRSS Reception by Text and Waterfall Viewer:
On Joe's VO1NA  online operation schedule and signal reports page he confims as follows: My QRSS100 test transmission from Newfoundland on 137.777 kHz received by DL4EAI tnx to DF2JP".  And on 5 Jan 2017 he confirmed (QSL) by e-mail: "Hi Joe, pse qsp  my congrats to Ruediger, DL4EAI whos reception I am pleased to confirm. 73 & TNX, Joe, VO1NA".

Joe, VO1NA was transmitting on 137.777 kHz with 500W into his huge and impressive antenna farm!
Below is my visual QRSS (CW) reception report by waterfall screenshot. 

QRSS LF / MF Grabbers of DF2JP are here online. 
Tip: This 2nd visual QRSS (CW) reception example is recorded by Joe, DF2JP using a Large Aperture Loop Antenna ALA100LN
which is showing a better results as my 52m Long-wire in this 2200m band comparison.

A dot duration = 90 sec. 


Device which I used:
Hardware: IC-7400 was
connected to a soundcard of a WIN PC. The Rx frequency was stand-by on 136.000 kHz in USB mode. Antenna connected was a 52m End-Feeded wire, which is not matched on LF/MF to the RX input.
Argo is a program to visually show QRSS, DFCW and other slow digital signals, into an easily configurable waterfall, taking its input from the PC sound card. 
Settings for Agro: under Agro/Calibration enter under frequency 136.000 and set the vertical movable Hz slider (right hand side) in the middle of the Agro-waterfall to 137.777. Then QRSS can be demodulated with the RX frequency set to 136 MHz with 1,8 MHz IF filter to keep strong LF adjacent channel signals rejected.   

Tip and General Information: O
n LF usually I keep
 WSPR-2, WSPR-15 and QRSS software running simultaneously on the tuned frequency 136 kHz in parallel, on the same PC and TRX. Further information's: QRSS Grabber compendium. Loop for 136 kHz.

The message of above infomation's are clear    Make more miles with digi modes
I want to say: if you want to work DX on LF, it is possible with a simple Long-wire located downtown in a large city having a lot of urban noise.  Details of my antenna in use, can be looked up on drawing of topic 4!

73's, see you in the pile up!
Rüdiger, DL4EAI

I am akctive in WSPR on following bands.
My IC-7400 transceiver running fully automatically with predominantly RX or TX band hopping mode exclusively on a Long-wire + VHF ANT for 6m & 2m.
RXing: 2200M, 630M, 160M, 80M, 60M, 40M, 30M, 20M, 17M, 15M, 12M, 10M, 6M, 2M; (active on 14 bands)
TXing: (2 Watt) 630M, 160M, 80M, 60M, 40M, 30M, 20M, 17M, 15M, 12M, 10M, 6M, 2M; (active on 13 bands)

Latest news about the mostly nighttime band 630m.
Consistently to my WSPR receiving (RXing) activity on MW, I started my 1st WSPR TXing transmission test on 474,2 kHz on 14 May 2017! To operate on MF with TXing is
another headache. It is no longer the men-made-noise level in the city, but the antenna length and height over gound as well as the efficiency of the matching network (loading coil - variometer) and of course, the earth conditions which is getting then most important of all. Details how I matched my HF antenna to MF can be seen in the schematic diagramm on topic4.
I hve issue my 2nd experiment on MF 474,2 kHz transmitting in WSPR mode with the Ulitmte U3 on July the 16. 2017 with 300 mW one night long.   

Tip: Typical digital modes used today are: WSPR, WSPR-15 (LF only), CW, QRSS, DFCW, FSKCW, JT9, Hellshreiber (standard and slow MFSK), JT9, JT65, PI4, Opera and ISCAT. In order to get a decent TX signal and a lot of fun; here is a nice article which explains in six practical steps: How-to-build-a-630m-antenna: http://www.f6ciu.com/630m/630vk2/630vk.html. Have also a look here.

Hope to catch you on WSPR sometime!
Rüdiger, DL4EAI


Topic 2
My Macro Stands Studio Concept                                   You see more and know more with super macros
Here are samples of my self-made multi-functional macro desktop stands, applying mostly standard devices, practically combined in a unique and pro way.

Horizontal Multi-Functional Focus Stacking Macro Stand
Tip: Take a closer look.

The art of macro photography is infinite with the right tools –> going beyond the limits.

Performing by special technology extend depth of field composed images with an optical magnification of up to 20x, getting ultra-high resolutions images by aid of "Helicon Focus Software" applying focus stucking technology!

Macro Stands: As you can see below, I made several macro stands for different applications to create high magnified and focus stacked images, which afterwards are rendered by aid of a special software to create also unique 3D images like the last coin section sample below showing or creating 3D Videos of the stacked images as well.

Focus Stacking Software: The focus stacking software is a tool allowing to achieve images with theoretically unlimited depth of field. It means that if you have a number of partially focused photos, or a stack, the program will render it into a fully focused image by combining the sharpest areas from each photo of the stack.

Macro Stand + Image Sample: The macro stand below showing the quantity of extension tubes required to perform a 10:1 optical magnification images with the EF-60 Canon macro lens. The image that I made of a hornets head (Hornissen-Kopf) shown on the bottom left hand side was made with 4:1 optical magnification (4x optically enlarged, plus your screen enlargement).

Vertical Multi-Functional Macro Stand
The camera display showing a enlarged details of a Five Euro Note.

MY FOTOGRAPHIC SUPREME DISCIPLINE   –   Super Macro of a Copper Coin Section

What’s about the image below?
You can see below a simple coin or specimen device holder which can be integrate into my multi-functional horizontal stucking stand (1st macro image above).

Furthermore, as one can clearly see, in the center of the complex created image a star. This star image was made by aid of macro lenses and stucking technology mentioned above. It is one out of six stars which are located on every 2-cent euro coin. The stars size are only 1mm in a diameter in its original size!

What is superb in the image?    
You can see high resolution details of a manufacturing embossing process, showing the very huge enlarged star. By a macro stucking rail process, I have combined 200 pieces of high magnified single images, which are processed with aid of photo stucking software like "Helicon Focus".

Have you seen the magic details?  
If you take a closer look to the center of that high magnified and high resolution image below,
you may see:
    -  A machine made embossed star in a real 3D effect.
A raised 3D effect at the image corners as well.
In addition, one can also see, especially for analytical purposes and that's the target for such images, 
the abrasiveness (roughness) structured surface caused by embossing work!

What can we learn from it?
Advanced analysis and quality control feedback information's of the ongoing manufacturing process: 
Quality results and consequences.
The more the coin surface roughness and less corner sharpness becomes an issue during machine made process, the more worn is the mold forming tool to be renewed or consequently be

Screen enlargement
Tip: If e.g. the star reaching 90 mm in size on your screen surface, 
that makes a 90x
enlargements of the 1mm star in its original size on the coin.

Grasshopper Macro in its Beauty Surreal Environment
Nature Pure    Enjoy Your Meal

Wide-angle super close-up overall macro photo is extremely difficult to take, unless the light is overcast
and a special high-magnification relay lens setup applied covering macro up to infinity (DOF) range.

The easiest way is to use a compact camera that has a "1cm" marcro mode with suffient magnification. ​Another way is
to use 
a wide-angle lens on a very short extension tube, for instance use a Nikkor AI-s 20/3,5 on the old K1 5,5mm ring.

In the middle of nowhere? No, it's only a 15 minute walk from here in the middle of the botanical garden of the University of Düsseldorf.

Amazing Details    Housefly Macro Photography  
Extend depth of field composed stacking close-up macro image,
spectacular details of a facet eye and mouth tools of a housefly.
Even dust contaminations is visible in details!

Image Resolution:
Tip: All images on this page had to be resized down to a size of 800x800. Consequently, the image
resolution quality of my here published images cannot be by fare as high as my original images are.

Düsseldorf my Hometown
Caution,  i'm  watching  you ...
targeting on you, with a harmless shot!


DL4EAI, Ruediger R. Westphal
Macro and Nature Photographer



Popic 3
My Amateur Radio Station 
VLF / LF / MF / HF VHF and UHF


Some QSO every Day, keep the Dr away!

IC-7400 HF / VHF all Mode Transceiver
RX: 0,03 MHz - 60 MHz and 144 MHz - 146 MHz (all amateur bands from 2200m to 2m)
TX: 80, 40, 30, 20, 18, 15, 12, 10 , 6 and 2 Meter ham band.
- Wiring setup of this remote base station see below topic 7 schematic drawings​.

CR-338 high stability TCXO unit installed.

Feature   I: To remote and operate this IC-7400 radio via Internet, it is connected to
See topic 5 of my online user manual for the remote station of DL4EAI. 

Feature  II: Guests and HAMs can tune my IC-7400 also to 144.019 MHz and listen to a Crossband 
                   online audio
Livestream of active 70cm repeaters 438-440 MHz. 
See drawing of topic 4/7 below).

IC-AH4 Random-wire Automatic Tuner  (160m-6m - RX/TX )
- Wide tuning range: 160m  -  6m and wide impedance range: 10 to 5,000 ohms.
- Minimum interference QRM because super-fast tuning and only 0.3 W radiated PWR during tuning!
- Once tuned, no tuning during the sending process, preventing to damage the tuner components
  against high PWR tuning, resulting in a long service life for transceiver filter and PA unit and tuner as well!
TIPs and details of the remote ATU.

SDRplay RSP1 VLF to 2000 MHz Wideband all Mode SDR Receiver requires a PC
The SDRplay is a powerful recent generation of economical (well priced) wideband full-featured Software Defined Receiver (SDR) which has an exceptionally wide frequency range​ and covers all frequencies from 8 kHz up to 2 GHz (without gap). It has 12 bit A/D conversion. The front end is protected by a series of automatically selected passive RF filters and 2x2 antiparallel overload front end protection PIN diodes. Great selectivity​ and super high sensitivity (!) with a low noise floor including variable IF bandwidth. Up to 10 MHz of spectrum can be monitored. I am using the SDRuno Software v 1,11.

Multiple ‘Virtual Receivers’ which allow for simultaneous reception and demodulation of different types of signals within the same receiver bandwidth.

Tip - Real time comparative testing using WSPR.  I use the SDRplay as referance device to compare antennas. Two receivers receiving simultaneously, one exciting a 'reference' antenna and another a test antenna by comparing the differential spotted results of sending stations.

Tip - Signal Indentification guide for digital modes is here. SDRplay and my antenna wiring details at my shack can be seen on the schematic drawing (topic 4 and 7) below). SDRplay schematic diagram is here.


Atlas 215X HF SSB/CW mode transceiver
My vintage mobile transceiver from the 70's, is completely equipped with transistors!
I use it for decoration only, sometimes used for special events and monitoring purposes.

My End-Fed Wire as Inverted-L Random Wire Antenna    HF ANT 1
For 160-6 mtrs I am applying a IC-AH4 tuner with a 52m Long-wire connected, which is oriented in east-west direction.
My wire is a simple random-length wire suspended from trees in a similar inverted-L configuration
. The vertical section has a strong infuence of the radiation, while the horizontal section provides capacitive top loading features. The performance of an inverted-L antenna system on HF relies heavily on the ground system.

Tip1: I assume, the same is true for 630 meter operation - likely the grounding system will be even more important at lower frequencies like VF/MF due to the relative "shorteness of the antenna. Losses in the ground system become a great percentage of the antenna resistance as the length is shortened, decreasing the overall efficiency. 
Tip2: As I do not want to enhance our ground system (garden) with added radials and rods. My ANT 1 is t
herefore working against a huge counterpoise, which exist of a copper pipe heating network of a large 11 flat Building. In addition for low band operation, I can use by a switch also the water pipe system. The coaxial cable of my roof ANT 2 (45m) acts  accidental as a radial to some degree as well.
Tip3: As my antenna is used for low bands as well and as it is located in the city, I have to live with a high noise foor. Due to "electronic pollution" I use the antenna at low bands preferably with digi mode and in difficult cases more and more in WSPR TXing mode.
Tip4: NEW, to use my Long-wire for MF TXing.  I want to avoid, that my 630m RF transmit power output (TPO) gets burned up in ground loss and dissipative ohmic conductor losses. I have upgraded the matching system for 630m band (see photo "test arrangement" under topic 4). Instead of  IC-AH4, I am using for 630 m band a loading coil (325 uH) inserted in series with a variometer (40 uH - 175 uH tuning unit) conected also in series to the Long-wire, which is more or less an inverted-L antenna 16m/36m . To match this on MW resonant ANT 1 to 50 Ohm I use for impedance matching an toroid core FT-140-43 using coil with taps (impedance steps). In addition, I have improved the counterpoise grounding system, by connecting the water pipe buried under ground in the garden by wire to the copper pipe heating network, which I have well experianced as good running couterpoise for HF already 
The drawing under topic 4 and 7 showing the wiring configurations.

Vertical HF/VHF/UHF ANT 2
-  For 20-6 mtrs alternatively I am using the 6m section of a vertical Diamond V-2000 antenna (matched by coax tuner).
   On 10m it is nearly a 1/4 vertical
polarized pin, with an efficiency like a good working mobile antenna. 
   As it is mounted on top of a high roof, it has a very low
urban noise floor compared to Ant1.
   Topic 4 and 7 below showing the wiring configuration. This antenna is also used for VHF/UHF.

MiniWhip E-Field-Probe ANT 3 (RX)
This antenna is mainly the design of the PA0RDT-Mini-Whip ©, (8 KHz to 30 MHz). See WSPR information at this link and at WSPR under Topic 8/9 at the final end of this page. For WSPR on 2.200 Meter and 630 Meter (8 kHz to 474 kHz) I use preferably the high performance of the MiniWhip antenna, hunged up in a small tree, 3m above ground.

For VLF/LF/MF/HF my home-brew MiniWhip reference antenna (IP3> +30dBm) receiving mainly Electrical fields. It can excellently be used for QRM illuminator and diversity purposes. In addition, it works excellent on my SDRplay receiver using SDRuno and WSPR-X software together. On 40 Mtr. e.g. the spots with the MiniWhip compared to my Long-wire are on the same level.

Tip: Note that the height of the antenna above ground makes a difference to the output signal level, but once you get outside the local noise field it does not make much further difference to the S/N  ratio.

It is a prefered solution to put the antenna up in a tree (>3m) and as far away from houses (>10m) as possible, run the coax down the tree to the chock and earth spike at the base of the tree and then run the rest of the coax back  to the shack either along the ground, or better still buried a few inches below the soil.

  I can transmit with the IC-7400 with 100W SSB or in WSPR (2W) on the Ant 1, which is located in 3 m distance to the MiniWhip (see topic 4 drawing below). Whereby, decoding my WSPR TX signal parallel in real time on the SDRplay running WSPR RX mode using the MiniWhip active antenna having no overload problems

Topic 4  
Antenna configuration and switching system
Antenna configurations are very limited in a city

The picture below show a drawing of my antenna arrangement
in our local residential community garden


My Long-wire Backyard Antenna is Invisible and Suspended in Azimuth Direction 100 Degree
Tip: In summer time e.g. at a distance of 2 m from the wire, one cannot see the wire of the antenna at all. 
What does it mean: If 11 flat owner do not see the antenna, during garden inspection, they do not care about it!
Never give up, there is always a way...



The 52m Long-wire is Suspended in 15 m Altitude in Our Garden
Below you see, for me two rare cases:
a) an overall view of our
completely snow coverd garden in winter 2017.
b) a visible Long-wire, which is normally unvisuble.

Tip: How to improve a vertical antenna by inductive toploading for low bands are explained here.                              

Antenna Switching Configuration Architecture
has Been Exteded to Transmit on 630m Band Too

More components with drawing details are shown in figure under Topic 7

– Posted in: 630 Meter Daily Reports, 630 Meters.
Joe, DF2JP has anounced here, that
a new DL station is now on the air at 630m band.  Joe provided these comments:

“Last Sunday (14 Mai 2017) we have trimmed the long-wire at Ruediger, DL4EAI on MF. The antenna capacity is 275pF, a small loading coil (325μH) + MF variometer (40-175 uH) made the job:” Above shown Schematic of DL4EAI’s antenna system retrofitted for 630-meters".

“A first test brought decodes of my RX (Joe, DF2JB) with -10dB, TX is a U3S with 200mW.
1118  -11   0.1    0.475717    0   DL4EAI        JO31     10     37

                      1126  -10   0.2    0.475717    0   DL4EAI        JO31     10     37
In autumn the vertical part of DL4EAI inverted-L comes higher to improve the radiation on MF and a small PA is already in the planning.


TIP: A Simple Matching Arrangement Setup For 474,2 kHz
With this setting and a miniVNA device, the transmission capability was successfully evaluated.

Existing Long-wire has 275 pF + MF loading coil 325 uH + MF Variometer 40-175 uH, attached at the antenna base, becomes a resonant TXing antenna for 630 m band, if the variometer is tuned to approx. 86 uH as below calulation is resulting.

630m with Variometer and Loading coil matched Invertet-L 12m/30m
Tip: Online variometer design calulator and more is here.


TIP: Online Antenna Simmulation Programm
As MF operation is becoming more and more popular, I applied this simmulation online programm on my Long-wire antenna, in order to get my existing end-fed wire antenna (inverted-L) matched on MF as well.


This is a SLOW-HELL Mode Transmission on MF, Issued by DF2JP Addressed to me.


Topic 5 
Public Remote Service  

Information’s  how to access and remote (my) transceiver's trough internet from your location (home, hotel e.g.)

Public Remote 

 Remote Controlled Internet Based Amateur Radio Stations 
In the case that an internet is available, you can access to control and operate my or other ham radio stations remotely from anywhere or optimize propargation by monitoring your own station on the other end. Just a WINDOWS pc / tablet or ANDROID smartphone / tablet and a low cost headset will do!

Tip: On client Internet user side you require only a PC, Tablet or Smartphone and RCForb software to a access my transceiver IC-7400 and perhaps other online remote stations as well.

In other words, overcome local stations restrictions or limited station capability. If all that is interesting for you, than follow the information and tips with further amount of interesting features below.

Please be informed, you have to be a registered user of the "RemoteHams" community. Therefore, visit here 
to create your free account.

You can enjoy operating remote amateur transceivers & more by joining the remotehams community. Don't miss rare DX you may never have a chance to hear. Test your own signal propagation, are you being heard in a DX location.

Furthermore, it can be a good occasion to use a remote, especially if you do not have a:
    - suitable antenna permission
    - locally high noise level, interference
    - or you are on a business or vacation trip

    - discover generosity remote operations
Advantage: A transport of transceiver, antenna and installation is not required at all!

What you need is the RCForb (Client) software for Windows SYS or an Android handy / Tablet App). It is an application you install on your computer for using all the online remotes.

You can use it for RX only or for TX and more! The client software also has a new built-in VOIP feature allowing users to easily RX and/or TX on remotes using a single application.


Get First Impression and Listen Online to Transceiver's or Receiver's
A online list of available remotable radio stations are published here. 

Software Downloads
In order to remote control transceivers within the "RemoteHams" community, the  RCForb (Client) software version for Android, WIN based device are required to be download at this link.
Tip: Getting started with RemoteHams software, see here.

International Legal Information's
It is highly recommended to look at this legal information’s posted in below listed link! Can I allow a licensed ham from another country to transmit? Information's see here.

Licensed Amateurs Radio Operators may can have Transmit (TX) Privilege
If you have a valid radio amateur's license issued by your government, a TX privilege may be given, provided you have uploaded a copy of your license here, which is an obligation!

you have to request TX privileges on each remote you want to use. Just click the "TX" button on the remote, and a message window comes up, asking if you want to request TX privileges, and answer "yes".

Each remote owner will have his own rules for granting TX privileges. When you are approved, there will be an (X) next to your user name (user name sample: (X) dl4test.

Rules to use Remote Stations
Operating Guidelines. General Remote Usage Guidelines. Ask To Tune Policy. Wait To Tune Policy. Preventing Hi-Jackers (Reserved Slots). Legal Information (General Public). Disclaimer. Information for USA Amateurs [FCC Laws] information's can be found here as well.

Documentations / Users' Manuals
of the client and server remote software you may find here. 

Documentations / Users' Manuals to the Remote Station IC-7400 of DL4EAI.
If you are a registered at RemoteHams and granted to be a user
at the remote of DL4EAI you will receive a completed and extended English and German User Manual version with many tips by email from me personally.

Tip: Listen to my Skype Account

Alternatively to above and below described technology, you as SWL can simply listen to my open Skype account: dl4eai-1 to the live audio downstream coming from my online remote transceiver IC-7400 DL4EAI.

Hope to meet you on the frequency or on my remote.

SWL reports are always welcome! Especially for transmissions below 1 MHz!

News: Since Sep.2016 
A similar remotable transceiver system like RemoteHams, a Multiuser-WEB-SDR (TRX) is issued by the DARC. Client software QtRadio download: www.r2t2.de. SDR online reception works already. One can also select various receiver location sites. Not yet remote sending possible. Multiple transceivers in action, up to 8 DSPServers in real-time.


Topic 6 
Online User Guide and Tips Using my Remote, DL4EAI
Accessing and Remoting my Transceiver by aid of RemoteHams.com                         ...stay tuned

Guided Tour...

CQ CQ CQ   DE   DL/HB9TEST  DL/HB9TEST  K        (example via remote)


Photo of my IC-7400 Transceiver used for the remote of DL4EAI 
Detail of the rear side showing the wiring of IC-7400 to remote it, is illustrated under topic 7.

Screenshot of the RCForb Client Program (WIN) Showing My Transceiver as Virtual Device on Your Screen
If you are connected to my remote at remotehams.com on a Windows pc, than you will see below remote functions of the IC-7400 available. The screenshot showing main receiver (RX) and transmitter (TX) related remotable functions which can be accessed by Internet and controlled.   

Guests and amateur radio operators logged in with an account at RemoteHams can enjoy to tune and listen online here to my remote for free, without need a permission by me!


Mobile Device Screenshots of the RCForb Client Program (Android)
If you are connected to my remote at remotehams.com with a mobile device, than you will see the remote functions of the IC-7400 available on you smartphone or tablet in individual windows.

The aim of this just to the point limited user guide document is, to give feature overviews with handling tips, how to make use of my Amateur Radio station consisting of various components in a highly efficient and secure manner, regardless of your location in compliance with the law, operating and controlling the remote on HF & VHF frequency bands, are described below:

A Request for Using my Remote!
It should be of interest reading this
user guide from time to time getting more familiarized with operating features and having more fun with the remote handling. In return, I keep this user guide for the remote of DL4EAI permanently up-dated!

Hints and Tips.
I read such highly technical things always in the morning, when the brain is empty (hi) and fully open for new thinks, rather than after a daily job been done.
The learning efficiency is than with me the highest (less hard work to be done)!

My Public Remote Equipment Setup of DL4EAI Consisting of Following Main Components:

   *  HF base station    ICOM transceiver IC-7400  (160m - 2m)   
*  Internal transceiver coax tuner  –  (20m - 6m) for my vertical antenna-2 (see topic 4 & 7)
   *  External long-wire tuner  –  IC-AH4  (160m - 6m) for my horizontal antenna 1    -" -
   *  Sufficient counterpoise for the Long-wire antenna-1 (central heating system of 11 flats)
   *  Powerful power supply** 13,8 V / 35 Ampere with a transformer avoiding RF interference (!)
   *  Special 8 pin RX and TX audio cable between TRX and sound card
   *  ICOM CAT interface C-IV to USB for remoting transceiver
   *  An end-fed 52m long-wire 
suspended in 15 m altitude above the ground in the backyard   
   *  Vertical (10m)/6m/2m/70cm Diamond V-2000 antenna-2 mounted high on the roof
   *  Unsymmetrical Coaxial RF-choke balun 1-30 MHz, 50 Ohm 
​   *  Diamond MX2000 Triplexer (details see topic 4 & 7) connected to the Diamond V-2000

   *  SWR/wattmeter to watch VSWR and output power (LF-UHF)
   *  Calibrated PWR Meter (dBm, uW, mW, Watt, Temp, Volt) made and designed by DB2DR 
   *  Desk top mike: ICOM IC-SM 6  (IC-7400)
   *  Intel dual core PC with windows 10, HRD, Digital Master 780 and WSTJ-X
   *  A fully metal covered "exone notebook server PC", without any fan!
 *  HP ZR24w Monitor  
   *  A very good and stable internet is absolutely required
   *  Android tablet PC for portable operating and for testing the remote radio system

** the seconarry circuit of the power supplay is protected by an self made over voltage protection
    with a thyristor and primary its protected by a relay which let blow up the transformer fuses!  

Please keep in mind, I have invested a lot of money in above listed devices and equipment's.
Therefore, treat my private remote station with care!

More details on all devices used for the remote, see topic 7. 

Guest, SWLers and DX Listeners are Welcome 
Guests logged in with an account at RemoteHams have free access to the receiver functions of the transceiver, without transmitting function of course, like a listen only membership.

I hope it will helps to recruit more newcomer to the hobby. ABC’s of getting a Ham radio license one can find here.

Tip: An informative great video about Amateur Radio is here,  "Amateur Radio a hobby for the 21st century" [ Great Video ].

Amateur Radio Operators 
Licensed / legitimated amateur radio operators as a new remote user can get familiarized by starting to test the remote functions without having TX permission requested. It is also useful to check signal propagation without being registered. I hope it will help to recruit more hams coming up also with an own remote as well! 
Tips for hams intented setting up a remote based station should have a look at topic 7.

   Login Popup Message

Connect Formality
If no one else is logged in to this radio you may tune / change the frequency or perhaps transmit "TX" without asking in advance.  

Identification operating through a remote is required! 
You have to announce, that you are transmitting through a remote station located in Germany!
It is independent from your physical present location. 

If you are a foreign operator (TX Users) on my remote, you must identify yourself independently from voice and or digital QSOs as follows: 

For example:   cq cq cq de dl / your callsign 
qrz de dl / your callsign

As my remote is located in Germany, do not forget to add:
DL/ in front of your callsign on my remote!

Receiving Ranges “RX”
Usable bands: VLF / LF / MF / HF and VHF. All amateur bands from 2200m to 2m

The  receiver  (RX) covering in total 14 ham bands and
the transmitter (TX) covering in total 11 ham bands.

The receiver frequency ranges: 
0,03 -  60 MHz - Info:  The Citizen Band (27 MHz) and sometimes also outside HAM band sections have been blocked on this remote
144 - 146 MHz - Tip:  Try the SCAN knob. To resume scan push 2x scan button.

Tip 1:
If you are interested in other frequency ranges, you may find
here and here some interesting remote receiver links.

TIP 2: 
All Mode Web-SDR Twente Receiver

University of Twente, Enschede in the Netherlands. On the page of that listed link below you can listen to and control a short-wave receiver located at the amateur radio club ETGD at the University of Twente. In contrast to other web-controlled receivers, this receiver can be tuned by multiple users simultaneously, thanks to the use of Software-Defined Radio, see link here and here.

TIP 3:

WSPR Mode Integrated in the Wide-Band WebSDR located in Twente
Continuously monitor the WSPR frequencies in all amateur bands below 29 MHz http://websdr.ewi.utwente.nl:8901/wspr/

TIP 4: Online SDR in the UK, see link here. This HF WebSdr is located at the Nantwich Secret Nuclear Bunker, formerly R.A.F. Hack Green, now a working museum.

Mode Available on My Remote
LSB, USB, CW, FM and AM mode can be selected and executed.

 Mode selecting window

Please check during a band change, if also a "Mode" change from e.g. LSB to USB 
(10 MHz to 14 MHz) manually is necessary.

Repeater Shift and Split Mode.
It happened several times, that users wanted to operate in SSB mode and did not noticed that a shift is still running. Therefore, FM repeater shift or split mode is only on request for a session available.

IF-Filter Bandwidth
You can select the "Filter" bandwidth “Wide”, “Medium” and  “Narrow” separately for each mode.

 Medium is recommended
(e.g. 2.4 KHz for SSB)

Generally start to use the medium filter. If you receive a strong signal and there is no QRM, that you toggle to filter wide. If there is QRM from the adjacent frequency, than use the narrow filter. 
                           Wide              Medium            Narrow
SSB:                 3.6 kHz             2.4 kHz           1,8 kHz
CW:                  1.6 KHz             0.9 kHz           400 Hz
FM/AM:           15.0 kHz           10.0 kHz           7.0 kHz

Tip: If you want to receive CW and digital signals in SSB mode, be sure that the auto notch filter "ANF" is switched off. In "CW" mode the notch filter is switched off automatically. CW TX mode is due to

Tip for CW Freaks: Following IF kHz section combinations can be used for cw reception:
3.600 LSB,  2.400 LSB,  1.800 LSB,  1.600 CW,  0.900 CW,  0.400 CW.

CW TX Simple Made
Tip: You can operate CW via Keyboard on my remote.
A simple way enabling CW TX mode is to use LSB mode on (any) remote station.
Just use MixWin3 / HRD etc. in CW mode and generate CW TX audio side-tone signals with the pc keyboard, that's all.

The CW enthusiast of course preferring a normal paddle against a keyboard.
Note: CW TX direct mode with a paddle is due to difficulties (extra comp port) not yet possible?

Digital Mode via Remotehams and Its Power Settings
Use always "USB" mode to apply following digi modes SSTV / PSK31 / RTTY and

Note: To protect the transmitter at digital modes, the transmit power must be reduced to less than 30% of the maximum adjustable output power of 100 %!

Therefore, check on the drop down, named "TX Mtr" that the TX power is below 30 % = 30 Watt.

Since recently I am controling the TX pwr locally. Remotely not possible anymore.

 Example Copy: SSTV ISS

As mentioned above, avoid audio clipping and TX overloading.
Please remember to reduce your internet to be transmitted audio in order to reduce the power output of the radio down to say 30 watts or less, as most Digi modes are 100% duty cycle modes.

Tips from DM5SR. Stephan located nr Koblenz Germany has published details how to apply digi mode tested with several popular software programs via RemoteHams.
GM - Digi mode software download collection listed here.

As foreign operators​ (TX User), do not forget to add: DL/ in front of your callsign on my remote.
Digi mode copy sample from WSJT-X user guide (JT65) made by K1JT:

                                  K1ABC G0XYZ IO91
                                  K1ABC G0XYZ R–22
                                  K1ABC G0XYZ 73


Meteor Scatter Mode (MS)
When calling CQ with FSK441A (WSJT) on 144.370 MHz most amateurs have adopted the method of sending 'CQ 385' which indicates they are calling split by transmitting on 144.370 MHz BUT listening on 144.385 MHz for replies, this avoids congestion. When the original station hears your reply on 144.385 MHz they then QSY to 144.385 MHz and both stations complete the QSO on 144.385. They do not work split after the CQ is answered. On 6m MS frequency is 50.370 MHz.

Tip: RX Preselection “Tune”
The used tuners are operating during receiving as frond end RX filter. This requires, that after a band change, it is always recommended to press "Tune" button, in order to get the antenna tuner also moved to the new dialed band, keeping the Rx sensitivity constant high!

 Tune Button

Tip: The S-meter and speaker audio will react if a signal strength increase will take place (typically 2-4 steps) on HF bands after "Tune" button been pushed (Works only for TX permitted (X) and (A)Users).

According to IARU Region 1 Permitted Transmit Frequencies.
Applied TX frequency activities are permitted only corresponding to your personal valid Amateur Radio license and license class of course and the German Ham band segments and regulations as well.

Permitted Ham Frequency Ranges of my Transceiver for
Transmitting "TX" from German Territory:

VLF / LF / MF / HF and VHF

 33 km                    8,270    RX        MGM (machine generated mode - digital) and CW - EbNaut decoder applied

2200m      135,7 – 137,8   RX        MGM (machine generated mode - digital) and CW
 630m       472,0 – 479,0   RX        MGM (machine generated mode - digital) and CW

  160m     1,810 - 2,000    RX/TX   Must reduce power below 25 %
    80m     3,500 - 3,800    RX/TX
    60m     5,260 - 5,450    RX         DL 5,3515 – 5,3665 (USB CW Digi) 15 W EIRP class A
    40m     7,000 - 7,200    RX/TX
    30m   10,100-10,150    RX/TX
    20m   14,000-14,350    RX-TX
    17m   18,068-18,168    RX/TX
    15m   21,000-21,450    RX/TX
    12m   24,890-24,990    RX/TX
    10m   28,000-29,700    RX/TX

      6m   50,080-51,000    RX/TX   Must reduce power below 25 % on this magic band
      2m 144,000-146,00    RX/TX

      2m 144,019 simplex RX       
Livestream: Listen to my IC-E91 or FT-8100 scanning 70 repeaters 438,0 - 439,0 MHz
                                                                      Tip: Simply push "SACN" button to reach this Crossband ch automatically 
(1 mWatt on a dummy load)

Note: Check local HAM Radio regulations regarding remote control transmitting.
          For 60m in DL 4 ch recommended: 5354, 5357, 5360 and 5363 kHz USB.
           In DL we can reach 5,358.5 KHz, it is one of the existing 5 MHz channels in the US.

Contest Operation
This remote is not a Contest Station. It has not continues operation performance!
Therefore do not use the IC-7400 for permanent contest operations.
I don’t mind, if some distance test rapports will be issued!
As foreign operators, do not forget to add: DL/ in front of your callsign on my remote!

Antenna Matching “Tune” for TXing
Tip: After a new frequency been dialed / tuned please push always "Tune" button before transmitting. Make sure antenna has a low SWR (access by "Tx Mtr" command - see image below).

Meter Indication Selection (TX Mtr)
Simply  toggle between "ALC", "SWR", "PWR" and "Comp" (compressor) meter to countercheck all parameters.

   Selectable meter indications

"TX" with CTRL+T possible or use the marked “TX” (PTT) button.

"Test" Button     Voice Chatting Mode  –  Intercom
Tip: This mode is like a conference mode without RF transmitting. When this button is active, the radio will not be keyed up, but the VoIP will be rerouted so (X) Users may make a conversation without keying the transmitter (PTT).

"xxx" Buttons

“Lock” Button – Android Sys
Tip: If you want to start to transmit with the android system, I recommend to use the frequency “lock” button function first!

Before you are goin to disconnect, please cancel the lock function, to avoid that other users cannot control the remote as it is locked.

“Mon” Button.
This function enables, that you can monitor (listen) to all transmitted audio conversations of logged in (X) User who are transmitting. The function cannot been toggled off! 

Tuners in Use on my Remote
ANT 1 is running with the external Long-wire automatic antenna tuner ICOM IC-AH4 and
ANT 2 is running with the internal automatic coax antenna tuner of the transceiver.

Remotable HF Antenna Switch.
The IC-7400 transceiver has an internal antenna switch to toggle between:
Antenna One”  ANT 1 horizontal 52m  long-wire (80m-6m) and
Antenna Two”  ANT 2 vertical 2,5m VHF antenna (RX: 20-2m) and (RX/TX: 10-2m).  

HF "Antenna 1"
It is a 52 m long-wire End-fed antenna which is connected always with an automatic long-wire tuner model IC-AH4 (160m - 6m). It is my best preforming antenna for all HF bands (RX and TX mode)! 

Internal Pre-Amps:
No need to use on bands 160m-30m any pre-amp it has no advantage. On the other hand, the RX will not be overload, as it has a high RX diynamic range.

HF/VHF "Antenna 2"
A vertical mounted V-2000 Diamond antenna is connected to the internal coax tuner which can be used alternatively for the bands 20m-6m. The main advantage can be, a strongly reduced urban noise floor during RX mode. However, the internal "pre-amp 2" is always required!

Advantages to Apply "ANT 2" for the Upper HF Bands:
- On 10m e.g. it is nearly a 1/4-wavelength as vertical pin.
- During band opening, DXing can be possible.
- Due to the internal coax tuner unused on the high on a roof mounted antenna 2, the antenna
  efficiency with that small vertical roof antenna is likewise a good vertical mobile pin, having
  strongly reduced noise level, compared to my long-wire mounted through the trees
in a backyard!

You can compare the antenna 1 and 2  simply by remote control.
For example, listen to a station on 21 MHz and toggle "Antenna 1" and "Antenna 2" on the remote, whereby the tuner every time been pushed before listening with the selected antenna. Whereby the pre-amp must be selected.

My Experience: I apply the 6m section of this VHF antenna 2 regularly in RX SSB mode on 20 m and upper HF bands, having an ultra-low urban man made noise floor with a signal-to-noise (S/N) increase of +10 dB (tested by WSPR) against my 52m long-wire antenna on the 20m band!

Please Note: the TX
reachable distance performance on 20m to15m of antenna 2 is not that good as ANT1.
But during receiving (RX) the reachable distance
on 20m to10m can be better, because ANT2 is mounted high on a roof having therefore a significantly less noise floor and a omnidirectional function!

VHF Antenna.
For 6m the “ANT 1” (horiz.) or “ANT 2” (vert.) can be used.
For 2m the “ANT 2” is automatically selected. Use always with antenna 2 the pre-amp2.

Screenshot of the client software for Windows 

The Waterfall with blue background below is the Twente SDR online receiver running parallel with my client software to get an assistant indicated were are ham stations active to tune the remote to:

Tip: RCForb Client Software and a web SDR Waterfall http://websdr.org/ in parallel giving an overview on the band activities by frequency.
What you see are SSB stations on 20m ham band in one view, utilizing a moderate Waterfall zoom function! Online SDR in the UK

Frequency Dialing Flexibilities:

Tips for Manual Keyboard VFO Scanning / Tuning.

CTRL RIGHT/LEFT =           0.1K Steps.
CTRL UP/DOWN =               1.0K Steps.


VHF Memory Scanning “Scan”.
The IC-7400 memory bank (100 FM memories) will be automatically scanned, when the "Scan" button is pushed. To resume push “Scan” button again 2x.

 FM Memory Scan

Automatically VHF activity and DXing Searching “Scan”.
If the memory scanner stops at an SSB frequency on 12m, 10m, 6m or 2m in “FM” mode,
then quickly switch to USB mode, it might be good DX conditions on the upper HF or VHF bands!

Convenient Frequency Tuning by Mouse Wheel Spinning.
Elegant solution: Set the mouse pointer over the VFO knob "tuning knob" and select next to it your “Steps” and leave the cursor over the “VFO” knob using the mouse wheel to step the frequency either up or down.

Mouse wheel pointer position  –  SCROLL THE MOUSE WHEEL

The frequency tuning by mouse wheel is convenient like the handling on a real VFO knob.

Advantage of the preset 500 Hz steps: Since recent years almost all SSB stations can be reached by 500 Hz steps!

DX Cluster   DXing by Mouse Click Only.
How to move / change in one step transceiver frequency and band instantly and jump to a DX spotted frequency?

Simply open at top right hand side under Windows > "DX Spots" and enter your callsign and select next to it a "dx cluster server" followed by double-click to one of a listed “DX spotted station”.

Whereby, the transceiver jumps instantly to that band and frequency! Select manually the correct mode (USB/LSB/CW) by hand.

DXing by Mouse Click Only

DXing with a Remote is Usually Limited
It should be noted, remote stations having reduced transmitting power and using multi-band antennas, among other complexities. A remote do not have the DX-business as an objective. Because, unlimited long distance DX qso will be reached through its Internet feature!

Android Handy / Tablet.
With Android system call up the DX Cluster and press “Connect” and click 2x to a spotted station, there you go. Alternatively a Windows tablet with the standard client software is suitable as well.

How You Can Connect Directly to my Remotable Station of DL4EAI?
You can access my remote DL4EAI and other remote station here
 or load the client software down and remote my station though it.

A direct link to my remote is here.


Listen With This Remote Station Online to 70cm FM Repeater Located Near Düsseldorf.
My permanent scanning ICOM IC-E91 passes received audio signals from 70cm FM repeaters to the IC-7400 on a special 2m FM cross-band frequency (1mW via dummy load).

When the cross-band frequency 144.019 MHz is tuned with the IC-7400 "VFO" and "FM" "Wide" is selected, then you hear active 70cm repeater signals online in real time on the internet side.

Automatically VHF activity and DX Searching.
If the memory scanner stops at an SSB frequency on 10m, 6m or 2m in “FM” mode, then quickly switch to USB mode, it might be good DX conditions on the VHF bands or a Satelit signal crossing!

Please Use My Memory Bank A.
A)  Remote Memory Bank: This particular cross-band frequency in addition to other stored ch by me, can be conveniently accessed from the remote memory bank in the Windows or Android client software!

Create Your Own Memory Bank B On My Remote. (Tip)
B)  Local Memory Bank: An other feature is, if the "local bank" and "Add" is selected, you can save yourself favorite frequencies with additional features into your own client software! For example: Club and DX-frequencies on various bands.


My Growing Up Remote Memory Bank A is Shown Below


A Request of Mine.
Please do not occupy this transceiver
over hours permanently
in one session! Because:

     - I myself as RIG owner,
     - privileged (X) Users, 
     - guests and
     - propagation testers 
want to share this remote as well!

Remote Service for HAM Radio Applications.
The free of charge service of this private financed radio equipment should not tempt to replace own station investments!
It must also not be used for commercial applications.

At my QSO End.
I usually reduce the TX power of my remote.

What remains more:

Well, that’s about it, thank you for reading this and please send any questions,
comments or "heckles" etc. to the e-mail address linked below.

World-wide one can reach me on my remote base station IC-7400 
and locally on my simplex frequency 437.025 MHz in Duesseldorf.

Also a chat massage on my remote will
reach me, when I am not lose to the TRX at the shack!

Vy 73 de Ruediger, DL4EAI

On My Remote !


Topic 7
Tips For Hams Intending Setting up a Remote Based Station
Other Information

Screenshot of the RCForb Client Program (WIN)
List of all worldwide remote stations which are online are

The purpose of this brief guide is to assist the ham operator who is curious about remote operations, but uncertain whether it will be interesting enough to set up an own remote station and perhaps sharing it to friends as well. 

This information is referring to the remote station of DL4EAI, showing the components requirement appears setting up a remote in a very simple and comfortable way.

My Public Remote Equipment Setup of DL4EAI Consisting of:
   *  ICOM transceiver IC-7400  –  servicing Amateur Radio bands: 160m - 2m
   *  External long-wire automatic tuner  –  IC-AH4  (160m - 6m) for my horizontal antenna

   *  Random wire ANT 1 - in the backyard over 15m altitude is a 52m long-wire hidden in a large tree 
   *  Internal transceiver automatic coax tuner  –  (20m - 6m) for my vertical antenna
   *  Transformer power supply 13,8 V / 35 Ampere, avoids overheating and RF interference
   *  USB Soundcard Interface including a ICOM CAT interface C-IV to USB for remoting transceiver

   *  Vertical 6m/2m/70cm Diamond V-2000 ANT 2 mounted high on the roof
   *  Unsymmetrical Coaxial RF-choke balun 1-30 MHz, 50 Ohm for 200 W maximum
   *  A 2nd external sound card for the IC-7400 remote radio station and RCForb Server software
   *  Diamond MX2000 Triplexer 1-6-60 / 110-170 / 300-950 MHz connected to the Diamond V-2000 ANT 2

   *  LF-UHF calibrated PWR Meter (dBm, uW, mW, Watt, Temp, Volt) made and designed by DB2DR 
   *  Desk top mike: ICOM IC-SM 6  for the remote station IC-7400
   *  Sufficient counterpoise for ANT 1 (central heating system of 11 flats)
   *  A WINDOWS fully metal covered Exone Notebook server PC without any fan. A good stable internet

   *  HP ZR24w Monitor
   *  Android tablet PC for portable operating and testing completely the remote radio system RCForb App
   *  Apple iPhone & iPad with Puffin browser (!) for instant monitoring the remote (except audio)
*  To maintenance my WINOWS server pc and managing the RCForb client software from distance directly,
      "TeamViewer" or RD Client software is running on the WINOWS server PC and tablet as well. 

Noise Reduction Device Lingua V6
When I am sitting in front of the remote, I normally use the LINGU device during monitoring the remote.

Description: Recognizing human speech by its characteristic envelope curve, to isolate and extract speech from the noisy signal received, and to feed the extracted speech content to the audio output. This process gives you speech without noise!

IC-7400 HF / VHF all Mode Transceiver
RX: 0,03 MHz - 60 MHz  
RX: 144 MHz - 146 MHz and 438 - 440 MHz (see feature II below).
TX: 160, 80, 40, 30, 20, 18, 15, 12, 10 , 6 and 2 Meter bands.
- W
iring details can be seen in the schematic block drawing below​.

Feature   I: To remote and operate this IC-7400 radio via Internet by myself, it is connected to RemoteHams here.

Feature  II: Guests can tune my remotable IC-7400 also to 144.019 MHz and listen to a Crossband online audio
​                   stream of active 70cm repeaters coming from my permanent scanning FT-8100 / IC-E91 
(see drawing below)
Feature III: Licensed hams may request full station control (perhaps including transmit capability for 80m to 2m) 

Feature IV: Skype livestream from the speaker audio of the online remote station IC-7400 of DL4EAI.
​                    Open & free Skype auto account: search for
dl4eai-1 and listen to the online live remote audio stream.

Rig and Interface
Below you can see my rig which to be connected to any USB Interface. In the photo sample below it is a high performance USB interface used, which has integrated a CAT interface and a soundcard and the possibility for keying CW keying (DTR) on the remote. 

Plug and Play Cable
A fantastic way to configure the radio cabling between the transceiver, interface and computer is super easy. It can be supplied for individual transceiver types as an optional package on request from the interface supplier as well. 
To get an image, how it looks like and how simple it is to set up the wiring, can be seen on the bock diagram below. As one can see below, it is a simple way wiring a remote,
 although the setup will be a bit more complicated than other sound card interfaces.

A Illustrating Drawing of the Total Antenna Configuration and Switching of My Remote Base Station is Shown.
As an example, the diagram is illustrating the different monitoring features and antenna comfortability of the remote station of DL4EAI located in Duesseldorf. 

Under the pillow is an IC-Q7E, hi

Additional Topic    Antenna Accessories and Configuration of The Remote.
The block diagram below showing, how I have integrated the
VHF / UHF vertical Antenna applied to a triplexer and the 52m Long-wire applied to the IC-AH4 tuner into my remote station

Access with Special Application Features For The Remote 
Feature A: Monitoring and Remote Controlling the Own Remote Base Station with
aid of DM780 from HRD
without using the RCForb Client Software and without being connected to remotehams as well!

Feature B: A further main reason for this mode can also be: if a (X) User is performing digi mode through your remote, you as remote owner can monitor through DM780
parallel in the background, without disturbing and sharing the running QSO. 

For distance remote control (not sitting in front of the own remote station) and 
for monitoring purposes of the outgoing voice and or dig. mode traffic, I am using sometimes:
    + Desktop Remote         
       (between desktop pc and mobile phone)
    + RCForb Remote          
(between RCForb server software on the desktop pc and internet to remotehams.com)
    + HRD (DM780) Remote​
(between DM780 to TRX to be able to change from my mobile phone freq. mode etc.,
       without beeing connected as client to remotehams).

together in one session on my iPad.
The audio is monitored by Skype or locally by IC-E90
(see above drawing: antenna selction architecture).

Note: HRD is required for this special remote function. Because the RCForb server software does not show any TRX controls nor any dialed frequency of the remote station. And TeamView or RD Server e.g. cannot be used for above desrcibed features. 

From a technical and legal view point one can say:
The owner of a transmitting equipment should always be interested to keep technical and legal problems as small as possible by preventing it.

On the other hand: the more (X) User are active on a remote, the more problems and misuse can occur. From a responsibility view point, monitoring may always be advisable. Below is a screenshot issued with my iPad showing the desk top win pc running

- RCForb server Software.
- Digital Master 780 (HRD)

With the two programs I can remote control from the background the IC-7400 without been direct connected to RCForb client software and I can monitor what frequency and controls are used by the
guests and (X) users on the remote station. In addition, I can remote control the TRX through HRD 780.

 iPad screen showing my WIN PC screen


Screenshots Examples
of my Remote Parameters Used in the RCForb Server Software

RCForb Server Setup Documentation here to download.


Combining Remotehams and WSPR net 
RCForb Server has the ability to set a "Memory" as a "home" frequency. This will make the server return the radio to a favorite spot (memory) after disconnect when no one is connected. At this point the remote owner should be able to leave the WSPR software running "decoding" whatever the radio hears.

WSPR signals are 2-minute long beacons transmitted by many amateurs around the world.

If you need WSPR software to control the radio, you can setup Elecraft K3 emulation in RCForb Server software. I have done this in the past to report PSK propagation.

Information to the WSPR digi mode 
you will find at the end of this documentation (WSPR topic 8/9).

 One Night TX WSPR on 40m

Legal matters
Owner of a remote base station should not worry about automatic stations mode,
because remoting is still a controlled operation, it takes an operator!

If you have any question, please feel free to contact me.

Vy 73 de Ruediger, DL4EAI


Topic 8 
WSPR Preface 

Weak signal ham radio communication  -  K1JT


WSPR signals are 2-minute long beacons transmitted by many amateurs around the world.

The WSJT project includes five programs designed for amateur radio communication using state of the art digital techniques. Typical applications include meteor scatter, EME ("moonbounce"), and QRP communication at HF. Passed on information's from Joe Taylor K1JT

(pronounced "whisper") stands for "Weak Signal Propagation Reporter."  This soundcard program implements transmitting and receiving for a digital soundcard mode usable with extremely week signals. Details at the end of this documentation, alternatively look here. Enter my call sign 2x (for RX / TX reports) under database to see my activity results in details by selectable filter settings.

Interesting DEU link:

First, a review of some relevant terms and motivations.  It's convenient to think of the various WSJT protocols ("modes") in two groups:

Slow modes
JT4, JT9, JT65, and WSPR.  These modes are designed for communication with extremely weak signals -- often too weak to be heard. Target propagation modes include EME and long-distance troposcatter on HF-and-up bands, and QRP Dxing on the LF, MF, and HF bands. Relevant signal amplitudes are approximately constant over a minute and more, aside from so-called "liberation fading" for EME. Transmit/receive sequences are 1 minute for JT4, JT9, and JT65, and 2 minutes for WSPR.

Fast modes
JTMS, FSK441, ISCAT, and JT6M -- and now also *FSK315* (implemented in WSJT) and *JT9E* through *JT9H* (implemented in WSJT-X. These modes are made for communication with rapidly varying signals: for example, meteor scatter, ionospheric scatter, airplane scatter, and scatter off the International Space Station. The decoders are designed take advantage of short enhancements of signal strength. T/R sequences are 30 seconds (or sometimes even shorter).

Summary Program Descriptions:
WSJT: Modes JTMS, FSK441, ISCAT, JT6M, JT65, JT4, Echo, CW. Optimized for meteor scanner, ionospheric scatter, and EME at VHF/UHF/Microwaves.

WSJT-X: Modes JT65, JT9. Primarily for use at HF.
MAP65: For EME an VHF and higher frequencies. Implements a panoramic, polarization-matching receiver for JT65.

WSPR: Probe potential propagation paths using low-power transmissions.

WSPR-X: Experimental version of WSPR, including the slow mode WSPR-15.

Source code is maintained here SourceForge. For installable end-user packages please go to the WSJT web site at the link below.

WSJT Web Site

System Requirements for WSPR:

  • SSB receiver or transceiver and antenna
  • Computer running the Windows, Linux, FreeBSD, or OS X operating system.
  • 1.5 GHz or faster CPU and at least 100 MB of available RAM
  • Monitor with at least 800 x 600 resolution
  • Sound card supported by your operating system and capable of 48 kHz sample rate
  • If you will transmit as well as receive, an interface using a serial port to key
  • your PTT line or a serial cable for CAT control. Linux and FreeBSD versions
  • can also use a parallel port for PTT. Alternatively, you can use VOX control.
  • Audio connection(s) between receiver/transceiver and sound card
  • A means for synchronizing your computer clock to UTC 

    Above list sounds like a lot, but if you’ve ever worked with any digital mode before such as PSK31
    or similar, you probably have all the equipment you need for WSPR operation – it works the same way!


Topic 9 

Here are informations of my 2nd HAM activity which I have posted to the WSPR homepage:

My ICOM IC -7400 transceiver is remote controlled during band hopping with automatic frequency and band settings on 14 bands, preseted by WSPR through CAT, band sequence and time functions, before
starting RX and TX operations (TX < 3 Watt).

I enjoy the fully RIG controlled and further superb WSPR functions to my IC-7400.
Especially the unique automated band hopping sequences, which are free selectable for all the
2190, 630, 160, 80, 60, 40, 30, 20, 17, 15, 12, 10, 6 and 2 Meter bands for RX operations. 
And for TX the bolded bands operations as well.

In the case, that the transceiver is remotely in stand-by (idle) mode at RemoteHams I often apply manually controlled WSPR RX mode in parallel, to keep the receiver part effectively on working for DXing propagation check, hi.


160-10 Mtrs up to 6 Mtr applying an IC-AH4 automatic tuner to a Random-wire antenna
from dx-wire comp.(endfeeded 42m Long wire antenna) hidden in a tree used for WSPR RX/TX.
For a good ground counterpoise, I use the pipe heating network of a large building.


30-10 Mtrs alternatively to the above mentioned Long wire a 2.5 m long vertical pin
(6m/2m/70cm Diamond V2000) base antenna for WSPR RX in use.

Advantage: With the internal coax tuner I can use ANT 2 for RX and with distance limits
for TX mode on upper HF bands as well.

I apply this VHF antenna irregularly in RX SSB mode on 20 m and
upper HF bands, having an ultra-low urban RX noise floor!

As ANT-2 is on 10 Mtr physically nearly a ¼ vertical pin, I use it during band opening in TX mode
with surprisingly results (>2000km), similar to a high on a roof mounted HF mobile antenna with a
good counterpoise.


On 6, 2 and 0.70 Mtrs my Diamond V-2000 (above mentioned ANT 2) is used for WSPR and others
modes (like FM and SSB) as its regular design.

On 10 Mtr it is nearly a 1/4 vertical pin. Therefore, with a coax tuner during open band easy DX possible.

Vy73 de Ruediger, DL4EAI


Usefull links:

PSKReporter: https://pskreporter.info/pskmap.html
HamSpots: http://hamspots.net
HamQTH: https://www.hamqth.com/
QRZCQ: http://qrzcq.com/
HAMLOG: http://www.hamlog.eu/
EQSL: http://www.eqsl.cc
QTH locator: http://qthlocator.free.fr/index.php
HRDLOG: http://www.hrdlog.net/
VOCAP: http://www.voacap.com/area/index.html
IOTA: https://www.rsgbiota.org/info/index.php
DXMAPS: http://www.dxmaps.com/spots/mapg.php?Lan=E&
Signal Power & dB: http://dwestbrook.net/projects/ham/dBCalc/?my_power=50&my_report=-01

Topic 9  
Echolink Gateway

Under construction


​DL4EAI       EchoLink Note Number 232364 active form iPad and iPhone
​DL4EAI-L  EchoLink Note Number 242226 Simplex Gateway on 70cm

I hope you find the site interesting and please feel free to drop me a note through the contact page.


Hope to meet you on the air soon.

Very best regards from Rüdiger





8163936 Last modified: 2017-06-17 05:16:24, 224426 bytes

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