[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [Discuss-gnuradio] mirrored spectrum around tuning freq
|
From: |
Marcus Müller |
|
Subject: |
Re: [Discuss-gnuradio] mirrored spectrum around tuning freq |
|
Date: |
Mon, 10 Aug 2015 18:39:16 +0200 |
|
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.1.0 |
Could be intermodulation due to driving the RX amplifier into nonlinearity;
Luca, what gain are you using? Can you further reduce it? Can you reduce
the amplitude of your test signal?
Best regards,
Marcus
On 10.08.2015 18:31, Martin Braun wrote:
> 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
>>
>>
>>
>> _______________________________________________
>> Discuss-gnuradio mailing list
>> address@hidden
>> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
>>
>
> _______________________________________________
> Discuss-gnuradio mailing list
> address@hidden
> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio