Hi!

This looks like a super useful addition to a remote HF site I run, which has (along with multiple KiwiSDRs - see kiwisdr.areg.org.au:8073 ) a pile of Airspy HF+ Spyservers - one for each amateur radio band.

There is an open-source spyserver client here: https://github.com/miweber67/spyserver_client which can stream IQ to stdout. It would be awesome if I could use this client to run WSPR decoders on the Airspys - this would avoid tying up channels of the KiwiSDRs.

I was able to proof-of-concept decoding WSPR via it using the following script (running it manually just before the start time of the WSPR transmissions) and a fork of WSPRd which accepts data from stdin.

FREQ=14095600

# SpyServer Details
HOST=localhost
PORT=5020

# SpyServer Connection, requesting 12 kHz of IQ bandwidth, and using lots of buffering.
ss_iq -a 1200 -r $HOST -q $PORT -f $FREQ -s 12000 -b 16 - | \
# Convert the incoming signed 16-bit IQ to floating point
csdr convert_s16_f |\
# SSB demodulation using a tight bandpass filter (0-3600 Hz), and then taking the real part.
# (I could probably make this a bit narrower) Also add on some AGC and limiting.
csdr bandpass_fir_fft_cc 0 0.3 0.05 | csdr realpart_cf | csdr agc_ff | csdr limit_ff | \
# Convert back into signed 16-bit format and pass into sox, then to wsprd
csdr convert_f_s16 |
sox -t raw -r 12000 -e s -b 16 -c 1 - -c 1 -r 12000 -t wav - trim 0 114 |
./k9an-wsprd -wf "14.0956" /dev/stdin

There's some information on how I compile and use the spyserver client utility for decoding HF APRS here: https://gist.github.com/darksidelemm/6b60767714295962771bca7b728b343c#file-spyserver_hf_aprs-sh-L26

Is this something that could be considered for a future release?

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Since in this case i'm talking specifically about airspy spyserver support, there's heaps of spyservers online that you can test against - no need to actually own an Airspy.

Another reason behind going with the spyserver route for each band has been that I can fairly easily attach other 'listeners' onto each spyserver, without much penalty in CPU cost. I can happy have maybe 20 users attached to each spyserver at the moment.

Right now i'm running HF APRS receivers up there, and more recently a club member has written a SSTV Skimmer which connects to the spyserver (https://github.com/xssfox/sstv-skimmer output visible on https://botsin.space/@aregsstv ) - if we were doing this on the KiwiSDR we'd nee a lot more kiwisdrs at the site!

Getting an all-band WSPR receiver going at the site is certainly the aim here! We already have airspys set up for 160/80/40/30/20/15m, and are planning on adding 17/12/10m soon. Later on we are also intending on adding omnidirectional horizontally polarised antennas for 6m, 2m and 70cm as well.

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