Re: LimeSDR USB parameter help

Hi

I was interested in using LimeSDR mini under GNURadio 3.8 / Ubuntu 18.04.

At present, I didn't succeeded in making it work using the gr-limesdr
3.8 branch https://github.com/myriadrf/gr-limesdr/tree/gr-3.8 (compiling
this 3.8 branch worked). My .grc example do not generate the .py file
and fails with the error:

Generate Error: 'catch_exceptions'
>>> Failure

Regards


On 27/01/2020 11:31, Amr Bekhit wrote:
> Hi Barry,
>
> I haven't tried it myself, but my understanding is that gr-osmosdr
> accesses the LimeSDR via Soapy and so I would have thought that it
> doesn't matter what version of GR is running at that point, as long as
> the LimeSDR drivers and Soapy are installed. The incompatibility that
> the LimeSDR has with GR3.8 is regarding the gr-limesdr blocks, if I'm
> not mistaken.
> https://github.com/myriadrf/gr-limesdr/tree/gr-3.8
> On Mon, 27 Jan 2020 at 01:13, Barry Duggan <barry@dcsmail.net> wrote:
>> Hi Amr,
>>
>> Do you, or anyone else reading this know if gr-osmosdr supports the
>> LimeSDR USB in GR 3.8?
>>
>> Thanks!
>> ---
>> Barry Duggan KV4FV
>>
>>
>> On 2020-01-24 17:00, Amr Bekhit wrote:
>>>> * should it work for GR 3.8?
>>>> Right now the Frequency sink just shows random noise.
>>> I have worked with the LimeSDR on 3.7, but not on 3.8. According to
>>> github, work is still in progress to port LimeSuite to 3.8
>>> (https://github.com/myriadrf/gr-limesdr/issues/44)
>>>
>>>> On the "Properties: LimeSDR Source (RX)" screen:
>>>>
>>>> Channel A Properties:
>>>> NCO frequency
>>> The NCO is used a secondary digital mixer to allow you to tune down to
>>> below the 30Mhz limit on the LMS7000. Set it to 0 to allow the driver
>>> to automatically calculate it for you.
>>>
>>>> Calibration bandwidth
>>> This should be set to at least the sampling rate. It sets the
>>> bandwidth across which the LimeSDR calibrates out the LO frequency
>>> bleeding into the received signal, if I'm not mistaken.
>>>
>>>> LNA path
>>> This sets the RF input port that is connected to the LMS7000 chip. The
>>> LimeSDR has 3 RF inputs per input channel: Low, High and Wideband.
>>>
>>>> Analog filter bandwidth
>>> This is a programmable analogue filter on the RF input. Like the
>>> calibration bandwidth, you can set this to 0 to let the driver
>>> calculate it for you.
>>>
>>>> Digital filter bandwidth
>>> This is a digital filter present after the NCO digital mixer. Again,
>>> set to 0.
>>>
>>>> Gain (dB)
>>> RF input gain - goes from 0-60dB. Probably start with something like
>>> 30dB and work from there.
>>>
>>>> * is the output signal centered at the RF frequency, or is there an
>>>> offset?
>>> The output signal should be centred around the RF frequency.
>>>
>>>> on the board there are RX1_L, RX_H, RX_W, RX2_L, RX2_H, RX2_W
>>>> connectors
>>>> INFO: device_handler::set_antenna(): CH0 antenna set [RX]: LNAL.
>>>> * which connector corresponds to LNAL? Is it RX1_L?
>>> If this is the Channel A tab, then LNAL refers to RX1_L. If it's the
>>> Channel B tab then LNAL refers to RX2_L.