1
$\begingroup$

I am transmitting a continuous wave and using one USRP B210 with the kitchen_sink tool in order to save the received samples from two RX channels (v.3.15.0)

When I look into the received signal on both channels, it seems that the Gain factor is only being applied to one of the channels as shown below.

Blue line is from channel 0 and orange line is from channel 1

This is the command that I am sending when executing kitchen_sink:

./kitchen_sink --rx-freq=868000000 --rx-gain=76 --rate=1e6 --rx-channels=0,1 --rx-ant=TX/RX --rx-file=data/_%1%_usrp.dat --clock=external --time=external --rx-start-delay=3 --rx-freq-delay=0.5

My UHD version is 3.15.0

What could be causing the difference in the signal between the two channels?

Improve this question
$\endgroup$
2
  • 1
    $\begingroup$ 1. Kitchen sink is a debugging tool, not a productive program. Don't use it for such purposes.$$ $$ 2. This sounds like an issue for the usrp-users mailing list, or support@ettus.com, but not for ham.stackexchange.com, to be honest.$$ $$ 3. try using rx_samples_to_file or GNU Radio instead. $$ $$ $\endgroup$ – Marcus Müller Feb 4 '20 at 10:18
  • $\begingroup$ Thank you for your comments @MarcusMüller. $$ $$ 1. I understand that. However, I faced the same issue when I wrote my own code to receive the data. $$ $$ 2. Good idea, I might try there. $$ $$ 3. I was using rx_samples_to_file when I was receiving just from one channel. From what I could gather, there is no way to receive from both channels using this tool. I am not sure if the GNU Radio could help with I am trying to achieve, but I will confirm. $\endgroup$ – Bruno Pessanha Feb 4 '20 at 11:22
1
$\begingroup$

The difference was caused by the splitter I was using to send the signal to both channels.

Improve this answer
$\endgroup$
1
  • 1
    $\begingroup$ I'm glad that you found the problem Bruno! $\endgroup$ – rclocher3 Feb 10 '20 at 17:45

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.