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DL6TY Germany flag Germany

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Hello and thanks for visiting my site, hopefully after a QSO!

Note: Frequent 630m operation and testing (depending on WX)
in HELL, FT8, JT9, QRSS and DFCW, sometimes also CW and RTTY.
QSL by E-mail highly appreciated, tnx in advance.
HNY 2018 to all hams and SWLs.

DL6TY in brief:

- handle: GERD (GARY)
- QTH: 15km north of Husum (North Sea Coast)
- QTH-Locator: JO44lo (80 km wnw of Kiel)
- born: 1956 - lis 1997 - addicted to radio and electronics from the mid 1960s

- TRX 1: ICOM IC-7200
  TRX 2: Kenwood TS50-S  (mainly 60m)
  TRX 3: Kenwood TS-515
  (decoration only, sometimes used for special events)
- almost all other parts of the station are home made on own designs
- ANT: 35m copper wire + h/b L coupler for all bands from 630m to 6m
- digimodes software: FLDIGI  and WSJT-X running on Debian 9 Linux
- interface homebrew /w optocoupler and audio transformer

- QRV in all modes, preferably PSK31, SSB and CW
- EPC Member #22769            FHC Member #4648

- 630m rig IC7200 + homebrew transverter (400W out, own design),
  arial same as for other bands
- obeying the DX Code Of Conduct http://www.dx-code.org/
- married since 1988, 2 adult kids
- tnx to my wife Karin and the kids for their patience with a kind of maniac ;-)

QSL policy: generally, I prefer qsll via EQSL.CC(AG) or LotW.
Please don't send cards via buro, I'm no DARC member anymore.
Incoming paper cards will be answered 100 p.c. without any cost
for You, i.e. no IRC or equivalent required, (postage is only 90 Euro
Cent in DL), SAE appreciated for preventing mistakes.
LotW uploads at least weekly if possible, usually after each QSO.
QSL for WSPR reports only if traceable on WSPRNET.ORG

                                                                                                 This is the front of my paper QSL









my special thanks to all operators who helped me get the awards by sending their e-qsl


2016-01-09 update: Added protection diodes between tx/rx relay and output stage. With the
IC-7200 control output for tx/rx switching there were RF spikes which blew the BFR96S.
2016-01-10 update: Today the output stage blew up again. This time the 68 Ohm resistor
between the PL socket and the protective diodes had changed its value all of a sudden to
well above 20 kOhms by the RF current spikes. Seems the protection has to be protected ;-)
I wonder why a renowned manufacturer like ICOM happens to forget an internal TX delay
(in order to protect external devices) , in my old TS50S, although very sparse equipped, this
fundamental feature had been implemented well. As a temporary workaround, I replaced
the single resistor by 4 times 270 Ohms in parallel. Let's see how long it will last...

Some remarks on the QRM canceller:

1. A proper auxiliary antenna and its appropriate position is essential for good results. The schematic is showing a
simple electrical version. In some cases, it is better to pick up the magnetic field of the noise source. A suitable
solution for 160m and 80m is a tuneable ferrite rod antenna (tuned by a variable feeding voltage of the phantom
power supply) shown in the second picture. This antenna can be turned towards to main noise source or vice-versa
it can be used as the main reception antenna by turning it the way that the reception minimum (i.e. the rod axis) is
pointing towards the noise source.

2. The noise canceller can only eliminate one noise source at a time. Though it is possible to cascade more than
one canceller, setting the amplitudes and phases would end up in a puzzle. If you are suffering from a complex
noise mix, consider building a small active reception antenna and place it somewhere where minimum noise levels
are present.

3. The noise canceller is not able to eliminate QRN because of the complexity of lightning action in thunderstorms.

H-Field Probe (Active Ferrite Antenna) for 160m and 80m

Note: D1...D8 required for voltage shifting to get wider tuning range are 1N4148 or equivalent
R1, C1 are used for damping the tuned input circuit L1, CD1 in order to prevent self-oscillation
on 80m.
With appropriate L1 and additional parallel resonating C it makes also a good performer on 630m and 2200m.

Other Toys...

Field strength indicator

Here is a little toy which may become a weekend project for some of you:
During maintenance work on my antenna, i realized that i was missing a field strength indicator. So i designed this little,
very primitive one using parts from my ham stock.
While testing the tool, i got somewhat shocked by the strong electrical fields in the vicinity of the so-called 'energy saving
lamps' and (as expected) of the widespread noise from our plasma tv. By the way, around noon, clear reception of the danish
long wave transmitter in kalundborg on 243 KHz (abt 170 km away) was possible without any preselection. With the optional
LC tuning circuit at the FSI input the little toy may be used as an AM radio to impress your kids, wife etc. ;-)
Currently I am using this tool for optimization of my antenne on 630 meters.


Digimode Interface

This simple interface allows for connecting the transceiver to a pc with electrical insulation
provided by an audio transformer and an optocoupler.

This design is using resistors at the symmetrical af ports for blocking straying rf (usually rf chokes are used here).
The audio transformers prevent hum loops. TRX level is set with P1. R6 may be reduced
to 1k if the transceiver mic input is insensitive (as is the case with my IC-7200).
The PTT section can be omitted if you are only planning to drive your SSB transceiver
with some audio enhancing device (like Behringer DSP audio processor).
If the optocoupler is too weak to pull down PTT voltage, the extension in the upper right is applicable.
This was the case with my ICOM IC-7200.


Microphone Preamplifier

A simple two transistor circuit for electret mikes, providing about 26dB amplification and giving
a frequency response similar to the heil hc5 capsule (10dB emphasis at 3KHz). a slight bass
accentuation (6db at 200Hz) for male voices is also included.


Minimal RF rejection is provided by the resistors at Pin 1 and 2, additional RF chokes (2x 470 µH) may be
necessary in some cases.


Remote matching unit for short antennas, e.g. for 630m operation

If you are lucky having an antenna with a Z below 8 Ohms, just upscale the capacitors keeping the binary staffing.
With my own 630m antenna, the variometer is consisting of two moveable coils of about 500µH and a 7 bit binary
staffed remote controlled inductance array (0...25 µH) which is part of my homebrew SW coupler.
Remote control is achieved by a microprocessor system sending frequency encoded hex commands as audio
signals over a single line. Maybe a strange solution, but it is working well and saved me installing a new control
cable where my current one has only 11 poles.

Strange signals on 630m:

Next pic is showing a chirped hell signal (captured at dk7fc's grabber on fb conds 2015-apr-21).
Thanks for providing the helpful utility dear Stefan!

Another example of HELL on MF

My anonymous greetings to Dave, G3YXM in Birmingham, received
in Heidelberg, Germany on DK7FC's grabber (2015-10-22, 2052UTC)
The waterfall picture had to be rotated 90 degrees clockwise and
flipped vertically to show up like here.

My same transmission, a few minutes later, at Daves' site.
The image appeared just the same on the original grabber
as shown here. Many thanks for Your effort, Dave, fb job!

Halloween 2015, producing funny effects on SP5XSB's
grabber near Warszaw.

Next schematic is a simple up-converter from about 10 KHz to 500 KHz.
It is using the (in)famous NE612/SA602 low power mixer from NXP.

In the arrangement shown it has a gain of about -12dB to prevent
being overloaded too soon.













MF operation is becoming more and more popular, and there might be a few hams wanting to
 get QRV there. Here is fundamental circuit for a proven TX concept which can be built using
 easily available components. It is a Class E PA with outstanding efficiency (at least 90 p.c.)
 Keying can be done by either feeding the RF input through a CMOS AND or NAND gate or
 better by switching the power supply with a P-channel Mosfet like IRF9140 or similar. The tank
 coil serves two purposes at a time, one is delivering resonance at operating frequency, the
 other feature is transforming the low output impedance upward to 50 Ohms.
 In my own transverter this circuit with adopted part values is delivering 400 watts from a
 single IRFP4227 with 24V/17A switch mode power supply (NUNUS S-400-24).
 Harmonics suppression is about 40dB, so no additional PI filter is required. Interested hams
 are welcome to mail me for tayloring the dimensions for their specific needs.
 I am running this PA for over a year without any problems, it even withstood excessive VSWR
 caused by antenna mistuning during heavy weather conditions.

Free counters!   

8549434 Last modified: 2017-12-31 22:35:08, 14231 bytes

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Public Logbook data is temporarily not available for this user
United States Counties Award#414
Granted: 2016-07-19 04:25:02   (DL6TY)

  • 100 Counties Mixed
  • 250 Counties Mixed
DX World Award#3975
Granted: 2016-06-01 21:40:03   (DL6TY)

  • 17 Meters Mixed
  • 20 Meters Mixed
World Continents Award#1396
Granted: 2015-01-23 20:28:08   (DL6TY)

  • 10 Meters Digital
  • 15 Meters Digital
  • 17 Meters Digital
  • 20 Meters Digital
  • 5 Band Mixed
  • 10 Meters Mixed
    12 Meters Mixed
    15 Meters Mixed
    17 Meters Mixed
    20 Meters Mixed
    30 Meters Mixed
    40 Meters Mixed
    60 Meters Mixed
    80 Meters Mixed
Grid Squared Award#1276
Granted: 2015-01-23 20:28:02   (DL6TY)

  • 5 Band Mixed
  • 10 Meters Mixed
    15 Meters Mixed
    160 Meters Mixed
    17 Meters Mixed
    20 Meters Mixed
    30 Meters Mixed
    40 Meters Mixed
    80 Meters Mixed
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