[Lowfer] Lowfer SIW sending EbNaut on 185.185... kHz

[Garry]

Tom, Spectrum Lab V2.93 should specify the action "wave.record" under 
Scheduled Actions. That will save the FFT information in .wav files 
beginning at the specified times. If you look at Options -> Wave file 
settings you should choose the Source as Decimated FFT input, Mode as 
Create a sequence of files, and Name something like 
EbNaut_<YYYYMMDD_hhmmss>.wav. The files will be written into the 
directory where the Spectrum Lab executable resides and can be chosen as 
inputs for ebnaut-rx.exe.

A good source of information on how to set up Spectrum Lab is at 
https://www.qsl.net/dl4yhf/speclab/EbNaut_Rcvr.htm. Make sure your 
receive setup is GPS-stable. I've found that sdr-iq reception can work 
with a GPS-referenced external clock and virtual audio cable even though 
the soundcard sampling rate just uses the typical PC crystal oscillator. 
But it's best to use a GPS-stable receiver/demodulator or downconverter 
that outputs audio at under the Nyquist rate (<24 kHz for 48 kbps 
sampling, etc.). That way the signal can be input to one side of PC 
line-in while 1pps GPS timing pulses to correct for sampling rate 
variation go to the other side of PC line-in.

If you're still having trouble send me an email and I'll try to help.
-- 
73, Garry, K3SIW, EN52ta, Elgin, IL