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Re: [Discuss-gnuradio] mirrored spectrum around tuning freq
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From: |
Martin Braun |
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Subject: |
Re: [Discuss-gnuradio] mirrored spectrum around tuning freq |
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Date: |
Mon, 10 Aug 2015 09:31:40 -0700 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.8.0 |
My first thought was "IQ imbalance", but it's pretty strong. Which USRP
and daughterboard do you have?
M
On 10.08.2015 09:24, Luca Pascale wrote:
> Hi all,
>
> why when I use:
> uhd::tune_request_t tr(tuningFreq);
> USRP_DEVICE->set_rx_freq(tr);
>
> I get a spectrum that is "mirrored" around the tuninFreq ?
> See: http://picpaste.com/sp-zJquS0qK.png
> with tuningFreq = 149.8 MHz, input signal at F = 150 MHz (from signal
> generator)
>
> If I use a LO offset different from zero the mirror effect disappear.
>
> Why ?
>
> Thanks,
> Luca
>
>
>
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