Hello !

Thank you for visting my QRZ.com Page. Since 11/22/2004 I am licenced as a radio amateur. My station is located in the northern part of Germany, approx. 100 km western from Hamburg. The QTH is Oldenburg i. O., JO43ce, CQ Zone 14 and ITU Zone 28.

I am working On- and Offshore as a Drilling Fluids Specialist and Tool Engineer in the Oil Field Service. My favorite hobbies are my Familie, myDog, Ham Radio, 4x4 Cars from Land Rover, Outdoor Activities (Canouing, Biking, Walking, etc.) and Astronomie.

The following picture shows a 270 degree view of my actually radio station. The rig-up was in the year 2009.

Here you can see my antennas I am using from 70 cm up to the 160 m Band.

On the screen shots below you can see my 41 m Half Square Antenna I build for the 40, 80 and 160 m band, in this case with a few radiation pattern for the 160 m band.

I am a member of the DARC (Deutscher Amateur Radio Club e. V., DOK i11), also I am a member of the ARRL (American Radio Relay League). QSL Cards please send me via Bureau, eQSL or directly. For myself I prefer eQSL. If you are interested in further information then please have a look to my yahoo link http://de.groups.yahoo.com/group/LowBandDXing. Contacts also possible via Skype Messanger, call DO5DGH.

A view of my eSSB Equipment / Rig

A PC Screen Shot of my Flex-3K, the Cover Picture of the LowBandDXing Yahoo Group and my QSL Card.

Most times, if I am not working offshore, you can hear me on Top Band between 1.840 to 1.850 MHz, +/- QRM. You also will hear me on Top Band during daytime, because I am very interested in propagation during daylight time. Please have a look for my sounding voice.

From time to time my CW-Beacon is running on 1.840 MHz. This beacon is only QRV for test and experimental purpose under my personal call. This beacon broadcast mostly during daytime, to explore the Short and Medium-Range Communikation. Short Range Path, so-called NVIS "Near Vertical Incidence Skywave" over distance approx. 500 miles.

CW-BEACON: Yaesu FT-897D, POWER: 5 Watt PEP, FREQUENCY: LSB 1.840 (CW 1.839,40 + Shift 700 Hz), PLAY / BREAK: 30 s (15 WPM) / 30 s, CW TEXT: DO5DGH JO43ce 5W Thanks for QSL, ANTENNA: 41m Half Square (2x 10 m vertical, top load 21 m horizontal)

ROS-BEACON: Flex-3K, POWER: 1-100 Watt PEP, FREQUENCY: USB 1.838 MHz, ANTENNA: 41m Half Square (2x 10 m vertical, top load 21 m horizontal). For further information please have a look on http://hamspots.net/ros.

DO5DGH BEACON, ROS-Mode, 5 W on Top Band, 01.07.2010, 18:00 UTC, RX WebSDR in JO32KF (University of Twente). Right side the ROS-Software with Beacon-Function.

Catching weak signals out of the noise floor by using a Software Defined Radio (WR G303e/PD/ADS) and a Spectrum Analyser Software (Spectrum Lab). In this case the weak beacon signal from DI2AW during daytime on 505.180 kHz. The WinRadio together with the powerful Spectrum Lab Software did a great job. By the way, the analyser resolution: band width 200 Hz, sampling rate 192 kHz and a FFT (Fast Fourier Transform) insput size 262144 (length). That means hard work for the PC´s Sound/VGA Card, but the result you can see below on the right screen shot.

It is really fantastic, if you have a look on the left WinRadio screen shot you can´t seen (hear)any signal on the 20 kHz display with a set IF-Bandwidth of 0,4 kHz. You only can see (hear) the noise floor from -96 dBm. But in combination with the powerful Spectrum Lab Software you can catch the weak signal from the DI2MW Beacon out of the noise floor. Well PC stuff for a high resolution provided.

Parts of my 41 m Half Square Antenna: 1:1 Balun (W1JR) with a T225-2 Core up to 1.5 kW, Remote Controlled Tuner (DL3LAC) and the 1st vertical section of the 41 m Half Square.

TY-900 Amplifier with a GU-74B (DL9MKA)

Efficieny of the TY-900 Amplifier with a GU-74B. The left analyser screen shot shows 10 W control power and the right screen shot shows 10 W control power + the TY-900 Amplifier.

On the Spectrum Analyser the TX SSB Signal from the FT-2K with the GU-74B PA (approx. 1 KW PEP) into a Dummy Load. TX Band Width 200 Hz to 2800 Hz (red markers). To prevent unnecessary splattern, a SSB Signal has to look like as the pics below. Please always becareful with extensive drive of the ALC!

Software Defined Radio - WinRadio G303e/PD/ADS. On the right side with the DRM Decoder Software.

On the left the Advanced Signal Conditoner and on the right the I/Q Demodulator Structure of the WR G303e/PD/ADS.

I am using following equipment:

RX/TX: Flex-3K (RX/TX-SDR), FT-2K, FT-897D, WR G303e/PD/ADS (RX-SDR), Papp-Radio (cheap RX-SDR)

MICROPHONE: Behringer B-1, Heil PR-781, Yaesu MD-200 (incl. HC-5), Astatic D-104, Heil Headset Pro (HC-5)

ANTENNA: 41 m Half Square (40, 80, 160 m), 2 Element Beam (10, 15, 20 m), Vertical (10, 15 m), 18 Element (70 cm), 2x7 Element (2 m), 2x Vertical (70 cm, 2 m)

GROUNDING: Station Rod Ground 9 m deep, HF Ground (steel mesh, 5 mm) 120 m² and 50 cm under surface + 4x Corner Rod Ground 2 m deep

TUNER: L/C Tuner remote controlled (DL3LAC), CG-2000 ATU

AMPLIFIER: TY-900 homebrew Amp. (DL9MKA) with GU-74B, gain approx. 12-14 dB (for low-power-gear)

DSP+SPEAKER: Behringer Audio Processing Stuff for eSSB and AM, Speech ExtractorPro, JBL Control ONE BassReflex with Subwoofer

HEADPHONES: Bose Quiet Comfort 15 Noise Cancelling Headphones - A Must Have :-)

POWER SUPPLY: Switching Power Supply -60 A Unit

FILTER NF/HF: Filter for all Power Lines / Cables going to the Antennas, Equipmentunits, Microphones, PCs, Power Supplys, Rigs and the 220 V Network

ACCESSORIES: Yaesu G-450C Rotor + Controller Unit, SSB 4x Antenna Remote Coax Selector, SSB 2 m Preamp, Schurr CW Key

MOBIL: FT-8900, Quad Band Antenna (70 cm, 2 m, 6 m, 10 m)

PORTABLE: TH D-72, VX-7, VX-2 (div. Antennas 70 cm, 2 m)

DIGITAL: Flex-3K, HRD, Digital Master 780, Interface Virtual Audio Cable + Virtual Com-Port Driver, PC AMD Phenom X4/64, 4 GB, Windows 7 64 Bit

I´m in my favorite city ofHamburg and my good friend Jack :-)

Peak envelope power is the average power supplied to the antenna transmission line by a transmitter during one radio frequency cycle at the crest of the modulation envelope, under normal operating conditions.

PEP was often used in non-broadcast amplitude modulation (AM) applications because it most accurately described the potential of mobile transmitters to interfere with each other. Its use is now somewhat deprecated, with the average transmitter power output (or sometimes effecitive radiated power) now typically being preferred.

W8JI - Rules of thumb for IM3 bandwidth:

The maximum frequency spacing of new intermodulation products is the difference between the lowest and highest pitched tones modulating the transmitter.The total bandwidth occupied by a SSB signal, when we include IM3 products, is approximatelythree timesthe audio bandwidth of the system.

W8JI - IM Distortion

Distortion products are a major cause of excessive bandwidth.Many forms of distortion products causing splatter cannot be heard when listening closely on frequency, and cannot be detected with a oscilloscope displaying the envelope!The splatter (excessive bandwidth) we observe most commonly comes fromodd-order products.

The Voice on 160 m

Catch me if you can!

73 Georg - DO5DGH

Just real with the Logo ;-

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