SDRplay Community Forum

That looks like HDMI interference to me. Each state lasts for a variable period of typically an hour or two. Does this happen to correlate with your screen saver? ;-) Thanks for the thought, but I'm pretty certain that's not it: the noise switches on and off in the middle of the night, it looks ide...

In fact the problem is visible directly in the IQ data passed to the stream callback... iq.png Also suspicious is that the average spacing between noise bursts is 126 samples, which is exactly one quarter of the numSamples=504 samples passed to the stream callback. This data was taken with no antenn...

I've got some code, written against the SDRplay API, which searches for intermittent signals caused by reflections from the ionisation trails left by meteors. It does this by running an FFT over IQ samples and then searching the result for a spike caused by such a reflection. This seems to work nice...

Thank you!

Hi... I'm trying to work out what the semantics are of the grChanged , rfChanged and fsChanged parameters to the mir_sdr_StreamCallback_t stream callback. I have a couple of questions which don't seem to be answered by the documentation... If, say, rfChanged is non-zero, does that indicate that the ...

Oh... I've just read more carefully and realised the gRidx parameter is in-out. So when I make the second call gRidx = 50 SetGrAltMode(&gRidx,TRUE,...) what actually happens is that gRidx is returned as 74, and the resulting RSP setup is BB GR=74, Mixer GR=0, LNA GR=0 -> System GR=74 I.e. the same S...

In that case I still don't understand what you're saying! Perhaps I'm being thick, but my reading of the API documentation and gain reduction tables says that if, for a band 1/2/3 frequency, I call SetGrAltMode(50,FALSE,...) , I get BB GR=50, Mixer GR=0, LNA GR=24 -> System GR=74 If I then turn the ...

That's what we do - I can't speak for other SDR application authors.

Where 'we' means SDRuno, I assume?

Thanks again!

Thank you! A couple of follow on questions, though... I can't see the behaviour you describe in the SetGrAltMode gain reduction tables. Take a requested gain reduction of 50 dB in the 'up to band 4/5' table as an example: the table says I get a gain reduction of 74 dB with the LNA off, and 50 dB wit...

I'm been trying to understand how gain control works when using SDR Console V3 with an SDRplay RSP1. I *think* the following is what's going on, but I'd welcome confirmation! The RSP gain can be controlled in either 'normal' (mir_sdr_SetGr), or 'alternate' (mir_sdr_SetGrAltMode) mode[1]. The latter ...