Support for SDRPlay Duo

[jnbrnk]

Support for SDRPlay Duo. Unit with two receivers. Want to use one channel/receiver for adsb, the other for ais-catcher. adsb use Soapy wrapper for SDRPlay, AIS-catcher cannot select tuner/channel 2.

[jvde-github]

AIS-catcher does support SoapySDR but you explicitly need to compile it in.

Also added some assumed Duo support but cannot test as I don't have such a device. If you could test would be great.

Should now list the Duo:

AIS-catcher -l

Tuner selection with the device free (ADS-B stopped)

AIS-catcher -d:0 -gs TUNER B -v 10

This should decode normally on tuner 2 / antenna B. Try TUNER A as well and compare message rates to confirm the right antenna input is being used.

The real goal — alongside ADS-B

Start your ADS-B decoder first, and it must claim the RSPduo in master mode — this is the critical part. With the SoapySDR wrapper the default is single-tuner mode, which locks the entire device and no second application can attach at all, whatever we do on our side. For SoapySDRPlay3 that means device args like driver=sdrplay,rspduo_mode=MA (master); check what your ADS-B software passes through. Then:

AIS-catcher -d:0 -gs TUNER B -v 10

Expected in the log:

SDRPLAY: RSPduo slave of a 6 MHz master, sample rate 2000K.
sample rate 2000K upsampled to 2304K.

[jvde-github]

Thanks for confirming it works.