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From: | George Nychis |
Subject: | [Discuss-gnuradio] in-band RX issues, higher freq? |
Date: | Tue, 18 Dec 2007 13:26:53 -0500 |
User-agent: | Thunderbird 2.0.0.6 (X11/20071022) |
Hi all,While it seems as though I've solved the I&Q problem in the FPGA, the in-band code now seems to be receiving a different frequency than the standard code. Here is captured data using the std and inband code of a 10MHz sine wave, with the in-band capture being the top graph:
http://www.andrew.cmu.edu/user/gnychis/inband_std.png To capture the standard output, I used: ./test_usrp_standard_rx -F 10000000 -o dataTheir amplitudes seem to be exactly the same, but the in-band code seems to be capturing a higher frequency. Can there be any other issue other than a daughterboard tuning problem? I'm setting the frequency properly using set_rx_freq() with a mux of 0xf0f0f0f0. The same transmitter is used to capture both sets of data.
Thanks! George
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