Yes, Lynux is surely great but we dummies use Windows. So let's see can we do there ;-)
Paul, my Rx is similar to yours. The SDR must be disciplined, then there is a software to deal with the I/Q and produce
demodulated USB audio at the dial frequency which then is feeded to Spectrum Lab via VAC. I see no need to compensate
sample rates in VAC, as sound sender and sound receiver are using the same clock (derived from PC clock) because all
is made in software. May be I'm wrong but as soon as there is no hardware sound card involved there is no need to concern
about it in VAC cables
SL is easy to use as you can load configuration files tailored to your needs. No need to become a SL expert in one week
And to get a disciplined source for your SDR, one way as commented by Stefan is a Ublox GPS. I can add another, which is QRPLabs VFO
Basically a U3S with different firmware. But the interface is integrated with a knob dial and display. Specially interesting
is that you can share your existing GPS for the U3S, so you don't need to buy a new one. Then you can generate the required
frequency for your SDR and modify it easily if needed
I want to make a local test generating EbNaut from a 10Mhz reference source, divided to somewhere around 137KHz
and decode it with my SDR setup
Question: To modulate the carrier in EbNaut I will use ebnaut_tx for Windows http://abelian.org/ebnaut/software_ms.shtml
Stefan told about using a simple XOR to shift the phase with the DTR/RTS output. Does it work for LF or as comments by
Paul Nicholson would be better to use a balanced modulator ?
73 de Luis
EA5DOM
