Longwave station

This is the operating position for the 136KHz longwave transmitter. The VLF SWR meter sits on the transmitter case, and the 25V 20A power supply is behind.

Single side band generator for the longwave transmitter

Uses the phasing method for ssb generation. CMOS logic integrated circuits ( D type and J-K type flip-flops ) produce the rf phase shift; a passive R-C phase shift network takes care of the audio phase shift. Plessey SL640 mixers are used. The prototype is shown undergoing tests. It is now fitted inside the transmitter case at the rear left. When it's connected to the PC soundcard, data, encoded as audio tones, can be transmitted.

Longwave transmitter

This transmitter for the 136KHz, ( 2190m ), band is another of my creations. It is capable of producing 350 watts from four IRF640 power mosfets with a 50V DC power supply. With this transmitter, I was able to complete the first longwave two-way communication ever accomplished in the history of the universe between Poland and Belarus, and Poland and the Czech Republic. Many thanks to my contact partners, Andrei and Ruda, for being at the other end of these historic contacts.

50MHz transmitter power amplifier

This home-made amplifier for 50MHz uses the Russian ex-military GS31B triode tube, producing about 500 watts output. It really is a fantastic performer. I remember some noteable reception reports of my signal, namely, "599+++ on my ground plane", "599+30dB" and "remarkable signal", from Belgium, England and Norway respectively !