Re: LimeSDR USB parameter help

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.