SDR# has just been updated to version 1525 (changelog) and it now includes a new program called ‘SpyServer’. SpyServer is a Windows based streaming server for Airspy devices, and is somewhat similar to what rtl_tcp is for RTL-SDR devices. To run the server, all that you need to do is plug in the Airspy on the server PC and open the server software. Then on the remote PC select the ‘SpyServer’ radio source in SDR# and enter the server IP and default port.
We tested SpyServer with our Airspy R2 and found that it worked perfectly, however due to the very high data rates the maximum bandwidth cannot be used over a slow network. On a standard WiFi connection we were able to use a bandwidth of up to 250 kHz, and on a remote test server over the internet only 37.5 kHz. The author of SDR#, Youssef Touil however has mentioned that a gigabit network can support the maximum 10 MSPS bandwidth option with no problems. We assume that SpyServer will eventually be updated to include low bandwidth options which only stream compressed demodulated audio and waterfall data.
The SpyServer is also implemented with a special multi client DDC architecture. This allows for many clients to connect to a single server, and they can each have a different frequency and bandwidth (within the current active bandwidth around the center frequency).
We think that the SpyServer should also work well with the upcoming Airspy HF+, an HF optimized SDR.
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