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My name is Chris and from 1942. With a bachelor technical background (Ing) and 30 years of very interesting jobs in industrial medical and defence field.  I got early retirement in 2001 and decided to apply for my HAM licence which I aquired in 2007. I'm still rather inexperienced as a HAM "novice" but learning every time. Also I moved from Holland to Germany (hence my new callsign) From the start I tried to master CW but at this age I found out it is not that simple. I never came beyond 5 words per minute. So I'm concentrating now a bit on digital modes like PSK, SDR, APRS and lately D-Star as well as DMR. Experimenting and building various HF antenna's has my attention as well. I do have a rather well equiped mechanical (amateur) workshop with small milling machine, TIG- welding machine etc.

My station at this moment is a Flex 6300, Cubic Communications (TWE)  SSPA (1.2 KW) linear, LL-Tuner, MFJ-998 autotuner, Kenwood TH-D72E in my car, Kenwood TM-D710 as (I-gate APRS) base station, Hytera DMR  DM-785G,  and interfaces for PC connection in order to operate digital modes. Secundary Trx is Icom-7100 with LDG-100 Tuner. I'm also operating an AIS station for shipping positions.

Antenna  is  full wave 80m Sky-loop for HF, Fritzel FB23 beam for 10, 20 and 15m.

2m/ 70cm verticals

Recently I used for monitoring my TX signal a Red Pitaya receiver (with HPSDR) or SDRplay (with SDR-uno)

Loop antenna grounding
Also notice the automatic antenna switch (with vacuum relay) which grounds my  loop antenna when not in use and is controlled by PTT of my new linear.

Audio/ PTT interface board

The images on the top represents a home-made  simple relay board which acts as a universal  interface when operating a linear via the PTT circuit. The relays either enable the PA and/ or interrupt the audio, speakers or 12V power to perifical equipment when operating the PTT. All this to prevent RF interference and crosstalk. There is also a terminal connection for a second transceiver isolated from the main transceiver.

Antenna relay box
The latest project is the remote antenna switch which consists out of a relay box and the controler box with display.
On the relay box all the various antennas (max. 6) are connected to one side and the other side 5 different transceivers.
All the combinations of antenna and radio are choosen on the control box with little pushbuttons and safeguarded by a PIC controler.
This PIC controls the relays drivers, anti bouncing, only 1 antenna at a time,

There is a safe mode which blocks a choosen status and prevents accidental deactivating a relay by RF interference or whatever during transmitting and controled by PTT,
There is a special mode for diversity receiving in order to choose 2 antennas and 2 radios,
After 1 hour of in activity  (programmable) a watch dog timer connects all antennas to ground.
On the relay box there are LED indicators to show the relay status.

2KW linear

Above are some pictures of my newly build 2KW- SSPA project according electrical design of W6PQL.

The mechanical parts are my own fantasy.

8292651 Last modified: 2017-08-25 07:59:55, 5934 bytes

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