Re: [Discuss-gnuradio] Transmitting changes a received value

[Marcus D. Leech]

On 06/14/2016 02:37 PM, Santos Campos wrote:

Hello, all!

This may be more of a board specific problem, so apologies if this is the wrong place to ask.

I'm sending a tone from one b200 usrp to a receiving one. I was trying to recover the frequency of the original tone and was able to do so while only receiving. 

However, when I tried to add a transmitting functionality, it seems that my received samples are "corrupted" and the frequency I was trying to recover bounces all over the place. I was pretty sure that they supported full duplex, so I'm not sure what it might be.

Any thoughts and suggestions are much appreciated!

-Santos

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You'll need to give more details of your setup.  Are you transmitting on the same frequency as you're receiving?  How are you antennas setup?

Within the B200 itself, there's roughly 40dB of isolation between TX and RX, so the RX side will be able to "see" your transmissions, and even if you're on a different frequency for RX, if the TX and RX pathways are close, so that there's little path-loss, the analog RX chain will almost certainly be driven into non-linear operating.