Re: [Discuss-gnuradio] Move USRP LO with USRP sink block?

[Marcus Müller]

Hi Jon,

that documentation can be found in the UHD manual [1] and specifically in the tune_request_t doxygen [2].

Greetings,
Marcus M.

[1] http://files.ettus.com/manual/page_general.html#general_tuning_rxchain
[2] http://files.ettus.com/manual/structuhd_1_1tune__request__t.html#af9d2c5fb89c10024b1acae43e88ebe7f

On 02/10/2015 07:55 PM, Jon West wrote:

When I transmit a signal at a certain frequency there is a large spike at what I have set the center frequency of the USRP. My signal does not have this large spike, because it is the LO of the USRP. We take care of this in things we write ourselves, but I can't find the documentation to do it for the GRC block. Here is the code I would normally use to tune the LO to something else, but still have my signal appear at the center frequency I would like

 usrp::multi_usrp::sptr u2;

 

      u2 =  usrp::multi_usrp::make(dev_addr_vec[usrpId]);

...

 

      uhd::tune_result_t tune_res;

      // tune with lo offset

      offset_freq_Hz = usrpConfig->rx_lo_offset_MHz * 1e6;

      uhd::tune_request_t tune_req(usrpConfig->rx_freq_Hz, offset_freq_Hz);

      tune_res = u2->set_rx_freq(tune_req);

On Mon, Feb 9, 2015 at 1:13 PM, Marcus D. Leech <address@hidden> wrote:

On 02/09/2015 11:53 AM, Jon West wrote:

Is there a setting to move the USRP LO in the SINK block? Not in code, in the block, I'm am integrating another developers system and need to use the GRC block

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I'm afraid you're going to have to expand on what you mean by the above. 

-- 
Marcus Leech
Principal Investigator
Shirleys Bay Radio Astronomy Consortium
http://www.sbrac.org

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