# Receiving different gain values on two RX channels on Ettus USRP B210

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.

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?

• 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.  Feb 4 '20 at 10:18
• 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. Feb 4 '20 at 11:22