Hello,
This is for the people like me who intend to use their SDRs with their transceiver as one integrated unit. For a long time (from 2008) I have been using a homemade solution for antenna switching and audio path switching. Small but useful improvements were made during these years which were result of obtained experience. Since I am convinced that this is a very useful device I decided to make proper PCBs out of it and to offer it to the ham radio community as a ready product. Go to for more details.
There are also 2 videos:
For the users of Softrock, the device has separate ground paths for PC audio and transceiver ground in order to avoid ground loops. This is quite important for direct conversion receivers. I use it with softrock type SDR synchronized with IC756pro trx and HDSDR. This SDR has a better dynamic range and usually the trx is used most of the time only as a transmitter. In my case , the HDSDR , Creative sound card and ASIO4ALL driver has a time delay below 200 ms which is acceptable even for contest work. This integration transforms your station into a state of the art setup: two independent or synchronized receivers and simultaneous waterfall display. You can use for receiving the TX antenna or a separate RX antenna even if your TRX does not have separate RX antenna input.
Chavdar lz1aq@... www.lz1aq.signacor.com
