Hi Alan:
It helped for sure. I thought that SparkSDR uses Soapy "core" as the driver for any hardware and this issue with AirSpy Discovery / HF+ was addressed in some way (changing parameters in Soapy before compilinhg or something like that).
I opened a ticket under Pothos\SoapySDR on GitHub but reading the ticket answers seems that the project has stopped a couple of years ago.
Anyway, I was trying to figure how to solve this Soapy issue because I'm using (I'm an end user, not programmer) Alex VE3NEA's SkyRoof app, a satellite tracking program that include several add-ons such as doppler compensation, rotor controller, CAT interface and ... built in SDR + waterfall ... to operate full duplex; the SDR part is the Soapy modules. Works ok with RTL-SDR but vy low gain on AirSpy.
Thanks for the support.
73 Marcus PY2PLL + PY3CRX