DL9JGO

ROOTS

Already as a child I was highly interested in electrotechnology with a special tendency towards radio technology. I modified my first transistor radio receiver T100 of VEB Sternradio Berlin in such way that one day I made a desperate and finally lucky attemp to invent and rebuilt the whole thing completely new, means I put in a new circuit with a self constructed circuit board (in that time still made of hard paper). I reused only the surface with all its buttons, switches and scale indicator. Everything should look the same as before. This “new” T100 worked on all wave bands (L-M-S). I was 15 ye ars old and actually only wanted to spice up a bit my long and expansive saved up "T100" for using it for ham radio.

As a teenager I naturally got in contact with the amateur radio section of our city Zwickau, though first mainly as a more passive SWL member without a sending license. With beginning my studies I got to the point where I had to decide whether I would stay faithful to the ham radio or if I would give my priority to music.

I finally choose music, but with a serious intention maybe one day to take the nessecary test in order to get a official sending license.

 

35 years later…

A long time has passed before it finally happened: In 2006 I acquired my “beginner license” to start with. Since 2010 you can find and hear me as OM (=Old Man) with the call signal DL9JGO on all ham radio bands.

My highly valued colleague OM Andreas (DL4JAL) seperates all radio amateurs into two groups: Some mainly like to "tinker", others are more often “on air”. In the beginning I was one of the former, but in the meantime this has changed a bit.

 

My Station

  • 2x23m dipol, 7m over ground (420m over sea level), direction E- W, feeder 6m
  • Balanced 1KW coupler (self-made) like DL1SNG, control unit in shack
  • 6 band hexbeam (foldingantennas.com)
  • C-pole antenna for 10m
  • SDR-transceiver 200W (self-made) like PIC-a-STAR (G3XJP)
  • Elecraft Panadapter P3
  • Yaesu FT-991
  • 1K2 LDMOS-PA (self-made)
  • QRP-transceiver (self-made)
  • Diamond X-50
  • Maas T YT-8600
  • Maas AHT-2-UV
  • Lingua Extractor
  • nitPIC Noise Reduction System
  • SDRPlay RSP2pro




Home Brew Projects

 

PIC-a-STAR Combo

  • SDR-TRX like G3XJP and VK3PE
  • Design DK5NOA
  • 200W PEP
  • with integrated DSP, no external software is needed (thus no notebook)
  • IF1: 10.7 MHz
  • IF2: 15 kHz
  • 15 kHz direct sampling
  • PA integrated like G6ALU (20W) with mods DK5NOA and DL9JGO
  • PA integrated like DK5NOA (200W)
  • Switching possibility to QRP (only little PA)
  • Touchscreen-TFT-Color-Display
  • Band pass filters with toroids
  • Additional AM receiving (DK5NOA)
  • Low pass filters like G4TZR and mods DK5NOA and DL9JGO
  • Keyer (lambic A, lambic B)
  • Automatic fan control
  • CAT-control (TS-2000)
  • AFSK-control
  • Dynamic range -134dBm (@10dB S/N) ..... +10dBm

 

screenshots --->
PIC-a-STAR Combo DL9JGO





1K2 LDMOS-PA

  • Frequency range 1,8 - 70 MHz
  • Power typ. 1kW PEP
  • IMD3 typ. 36dBc
  • CAT-Control possible
  • -60dB-Side chain output 
  • Automatic fan control (5 monitoring points) 
  • Processor-based control and monitoring
  • protection features:   current - temperature - input power - reflected power - mismatch
  •  

    screenshot --->
LDMOS-PA



QRP-Transceiver

  • 10-Band-TRX
  • at most 20 Watt PEP, infinitely variable
  • for supply system on board 13,8V
  • 9 MHz-Exciter like DK3SP with high level mixer SBL1MH and crystal filter 2,4KHz band width
  • DDS-VFO like DL4JAL
  • Band filter unit with switched pre-amplifier / attenuator
  • Logic unit
  • Attenuator with pin-Diodes to manual control of transmitter power
  • PA like G6ALU and mods DK5NOA and DL9JGO
  • Low pass filters
  • Directional coupler like DL4JAL
  • AGC on/off/automatic/manually
  • Keyer

 

screenshots --->
QRP-Transceiver DL9JGO




Software

CAT control for antenna coupler

For the balanced 1KW antenna coupler BX-1000 developed by Norbert DL1SNG I wrote a console program (download here), where the QRG tracking of the coupler is done automatically by the CAT signal of the respective TRX. The program runs under Windows 7/8/10/11.

Another small program for this coupler (download here) allows to create and manage backups of the channel parameters stored on the coupler. The program runs under Windows 7/8/10/11.

Radio amateurs, who own the 200W antenna coupler BX-1200 (also by Norbert DL1SNG), inspired me to develop corresponding program variants also for this coupler:  --> console program,  --> backup program.
Both programs can also be run under Windows 7/8/10/11. My thanks go to Norbert DL1SNG, who lent me his coupler hardware for this purpose.

A detailed description of the above programs has been published in issue 1/21 of the magazine "Funkamateur".

CAT control for LPF

For my LDMOS-PA I developed an Arduino© circuit which allows frequency controlled switching of the low pass filters. You can download the little documentation here.

LocatorMap

There are plenty of websites for displaying any locator. However, I wrote a program that works without starting a web browser: LocatorMap. The program can be run on any Windows PC.

AntennaMap

The leading portals for uploading ADIF log files also provide a graphical representation of the QSOs made on a world map.

However, it is usually not at all or only with difficulty possible to differentiate according to individual amateur bands. With my program 'AntennaMap' it is possible to read out the achieved connections band and also mode specific from an ADIF log file and to display them graphically. So it is possible to draw conclusions about the radiation characteristics of the antenna for the individual bands.

AntennaMap

This program also does not require a web browser to be started and can be run under Windows 7/8/10/11.

SquareCoax

This program is used to calculate the relevant parameters of a coaxial transmission line. The download of the program "SquareCoax" is available here. It can be run under Windows 7/8/10/11.

SquareCoax





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