Ok.
Also check that a correct input is selected on both chips
(--lms-get-rx-lna option).
Then, could you check whether this is consistent among both UmTRX you have?
On Fri, Aug 2, 2013 at 12:55 PM, jiangwy <wyjiang(a)ljshuoda.com> wrote:
I use the following command
./umtrx_lms.py --lms {1,2} --lms-get-rx-vga2-gain
the outputs are all the same ( 15 ).
________________________________
jiangwy
From: Alexander Chemeris
Date: 2013-08-02 16:20
To: wyjiang
CC: UmTRX
Subject: Re: The Difference of Signal Strength From Two Channels on The Same
Board is Big
Hi Jiang,
Are you sure you're setting Rx gain properly for both channels?
I recommend you to use umtrx_lms.py script from this repository to
check Rx LNA and Rx VGA settings for both LMS chips:
https://github.com/fairwaves/umtrx_scripts
On Fri, Aug 2, 2013 at 12:09 PM, jiangwy <wyjiang(a)ljshuoda.com> wrote:
Hi Alexander Chemeris,
According to rx_multi_samples , I write a program to receive samples from
two channels on the same board.
The program receive samples from 2 channels and calculate the signal
strength respectively. The signal is from a BTS arround.
I find the difference of signal strength is very big, about 20dB, and
channel 1 is bigger than channel 0.
I exchange the antenna and feeder of the them, but the result is same.
I think there is some problem, but I cann't find it.
Would you please give me some sugguestion?
Best Regards.
________________________________
Jiang Wenyi
--
Regards,
Alexander Chemeris.
CEO, Fairwaves LLC / ООО УмРадио
http://fairwaves.ru