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From: | Josh Blum |
Subject: | Re: [Discuss-gnuradio] if uhd_transmitter instantiated after receiver, TX works, otherwise RX works |
Date: | Mon, 18 Jun 2012 10:51:58 -0700 |
User-agent: | Mozilla/5.0 (X11; Linux x86_64; rv:12.0) Gecko/20120430 Thunderbird/12.0.1 |
> 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
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