Re: [Discuss-gnuradio] if uhd_transmitter instantiated after receiver, TX works, otherwise RX works

[Josh Blum]

> Thanks for the tip. I think I figured it out.
> 
> The property to use an LO offset was true for TX and not RX. This would
> mean that tuning an individual chain and using it would be fine; but
> since there is a shared LO, the offset would not be compensated for by
> the DSP on the chain in the other direction, hence, it not working.
> 
> If you dont mind trying, here is a simple 1 liner patch:
> http://pastebin.com/KiR3e6j0
> 

Another quick way to test this without the patch would be to tell the
tune request to use an LO offset of 0. Example:

usrp_source/sink.set_center_frequency(uhd.tune_request(my_freq, 0))

-josh