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

[Glen I Langston]

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

> 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
>