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

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 <vine35792468@gmail.com> wrote:
>>
>> On Thu, 14 Nov 2019 19:35:13 +0000
>> Chris Vine <vine35792468@gmail.com> 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
>>
>