Re: Gnuradio for Raspberry PI 4 and SDRPLay works well, but need documentation

[Marcus D. Leech]

On 11/15/2019 09:17 AM, Glen I Langston wrote:
> Thank for your help Chris,
>
> I have now gotten the SDRPlay connected to my telescope
> and the results are looking reasonable.
>
> My initial problems were with the sense of the gain values, which
> are actually attenuation values for the SDRPlay.
>
> It seems like the defaults are reasonable, and that probably
> the correct band pass filter is being chosen for the
> observing frequency of 1420.4 MHz.
>
> I still do not fully know what the LNA slider value does.
>
> FYI the initial interfering lines seem to have gone away after
> I got sufficiently strong signals into the SDRPlay.
>
> Best regards
>
> Glen
Glen:

I'm keen to learn of your progress on this.  I bought a couple of the 
much-cheaper "clones", and I have them working, but haven't tried any
  astronomy with them yet.

Cheers
Marcus

> > On Nov 14, 2019, at 2:57 PM, Chris Vine <address@hidden> wrote:
> >
> > On Thu, 14 Nov 2019 19:35:13 +0000
> > Chris Vine <address@hidden> wrote:
> > > The original poster can get some information from installing soapy and
> > > doing 'SoapySDRUtil --probe'.
> > I should probably have appended what the probe tells me about my RSP1A,
> > which may or may not apply to his:
> >
> > ----------------------------------------------------
> > -- Device identification
> > ----------------------------------------------------
> >   driver=SDRplay
> >   hardware=RSP1A
> >   mir_sdr_api_version=2.130000
> >   mir_sdr_hw_version=255
> >   serial=xxxxxxxxxxx
> >
> > ----------------------------------------------------
> > -- Peripheral summary
> > ----------------------------------------------------
> >   Channels: 1 Rx, 0 Tx
> >   Timestamps: NO
> >   Other Settings:
> >      * RF Gain Select - RF Gain Select
> >        [key=rfgain_sel, default=4, type=string, options=(0, 1, 2, 3, 4, 5, 6, 
> > 7, 8, 9)]
> >      * IF Mode - IF frequency in kHz
> >        [key=if_mode, default=Zero-IF, type=string, options=(Zero-IF, 450kHz, 
> > 1620kHz, 2048kHz)]
> >      * IQ Correction - IQ Correction Control
> >        [key=iqcorr_ctrl, default=true, type=bool]
> >      * AGC Setpoint - AGC Setpoint (dBfs)
> >        [key=agc_setpoint, default=-30, type=int, range=[-60, 0]]
> >      * BiasT Enable - BiasT Control
> >        [key=biasT_ctrl, default=true, type=bool]
> >      * RfNotch Enable - RF Notch Filter Control
> >        [key=rfnotch_ctrl, default=true, type=bool]
> >      * DabNotch Enable - DAB Notch Filter Control
> >        [key=dabnotch_ctrl, default=true, type=bool]
> >
> > ----------------------------------------------------
> > -- RX Channel 0
> > ----------------------------------------------------
> >   Full-duplex: NO
> >   Supports AGC: YES
> >   Stream formats: CS16, CF32
> >   Native format: CS16 [full-scale=32767]
> >   Antennas: RX
> >   Corrections: DC removal
> >   Full gain range: [0, 48] dB
> >     IFGR gain range: [20, 59] dB
> >     RFGR gain range: [0, 9] dB
> >   Full freq range: [0.01, 2000] MHz
> >     RF freq range: [0.01, 2000] MHz
> >     CORR freq range:  MHz
> >   Sample rates: 0.25, 0.5, 1, 2, 2.048, 6, 7, 8, 9, 10 MSps
> >   Filter bandwidths: 0.2, 0.3, 0.6, 1.536, 5, 6, 7, 8 MHz