Hi Alan,
Thanks for response.
I am not into details but all I know is that it simulate HPSDR.
On PowerSDR it is just setup as HPSDR and I can switch on and off the second receiver.
So I think it is as you mention.
The easiest thing would be if you send me a version of Sparkm with just the adres of the second receiver as on the HPSDR multi boards box I test if it receives on the other port.
If it works you could ad a checkbox in the virtual receiver settings RX1 or RX2.
Regards Ron