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 <vine35792...@gmail.com> wrote:

On Thu, 14 Nov 2019 19:35:13 +0000
Chris Vine <vine35792...@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