Monday, July 21, 2014

Open Interface by ready 4U

   There is our new article, it is Open Interface. Middle box between your TRX and PC. The Interface is based on the Arduino open source K3NG CW keyer (link), USB to serial converters, USB audio codec and USB hub among all.

   There is a block diagram:

   The first seven pieces ready for you. More here.

   We used two of these interfaces during IARU HF contest 2014 as OL4HQ on 15m CW. We could not find any problem, no reset needed... BORE :)

Tuesday, July 1, 2014

News at OL7M QTH :)

   Unfortunately we do not have enough time :( Anyway we have some news there. New 5el OWA yagi for 20m band is now at 31m. It is situated above 80m wire system.

And we are not only amateur radio QTH :)

Six2two switch by

   This is a classic design of the double switch. PCB and relays can handle up to 3,5 kW and isolation is better than 80 dB. More information is at


Example of use:

Insert loss:


The worst SWR: