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Re: Gnuradio for Raspberry PI 4 and SDRPLay works well, but need documen
From: |
Glen I Langston |
Subject: |
Re: Gnuradio for Raspberry PI 4 and SDRPLay works well, but need documentation |
Date: |
Fri, 15 Nov 2019 13:21:50 -0500 |
Hi Marcus,
Two good things about the SDRplay, now that the gnuradio interface seems
to be working, are:
1) Very high gain. I need about 30 dB of IF attenuation to get the levels
right.
2) Very good data transfer rates. Right now I appear to be getting 100% of
the 7 MHz samples
delivered to a raspberry Pi 4 and/or Odroid n2.
I’ve not yet fully checked the SDRPlay for short term transients.
Note that the Pluto SDR has no (or at least few) short term transients in the
RF.
I did find the AIRSPY did have some transients that seem to be due to the
device.
These occur a few thousand times a day, but for shorter than 100 micro seconds.
Total time on is less than a second a day.
I’ll try to do another calibration test. My initial test seemed to show
significant gain changes
across the 7MHz band, as if I have the wrong filter selected. At one end the
Tsys was too
low and at the other end the Tsys was too high, with a reasonable value of
about 100 K
in the middle of the 1420 MHz band.
Still trying to figure this out.
Best regards
Glen
> On Nov 15, 2019, at 11:56 AM, Marcus D. Leech <address@hidden> wrote:
>
> 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
>>>
>>
>
>
- Re: Going from GUI to non-GUI operation., (continued)
- Re: Going from GUI to non-GUI operation., Amr Bekhit, 2019/11/14
- Re: Going from GUI to non-GUI operation., Glen I Langston, 2019/11/14
- Re: Going from GUI to non-GUI operation., CEL, 2019/11/14
- Re: Going from GUI to non-GUI operation., Nick Foster, 2019/11/14
- Re: Going from GUI to non-GUI operation., Marcus D. Leech, 2019/11/14
- Re: Going from GUI to non-GUI operation., Nate Temple, 2019/11/14
- Re: Gnuradio for Raspberry PI 4 and SDRPLay works well, but need documentation, Chris Vine, 2019/11/14
- Re: Gnuradio for Raspberry PI 4 and SDRPLay works well, but need documentation, Chris Vine, 2019/11/14
- Re: Gnuradio for Raspberry PI 4 and SDRPLay works well, but need documentation, Glen I Langston, 2019/11/15
- Re: Gnuradio for Raspberry PI 4 and SDRPLay works well, but need documentation, Marcus D. Leech, 2019/11/15
- Re: Gnuradio for Raspberry PI 4 and SDRPLay works well, but need documentation,
Glen I Langston <=
- RE: Gnuradio for Raspberry PI 4 and SDRPLay works well, but need documentation, Getz, Robin, 2019/11/19
- Re: Gnuradio for Raspberry PI 4 and SDRPLay works well, but need documentation, Glen Langston, 2019/11/19
- RE: Gnuradio for Raspberry PI 4 and SDRPLay works well, but need documentation, Getz, Robin, 2019/11/20