Re: [Discuss-gnuradio] peak near center freq for noise signal, how to fix it

[Alex Zhang]

I remember that some DC is manually added into the frequency point which can be divided by 5Mhz or 10Mhz? Besides the DC at the your central freq, be aware of that if the lo offset setting makes your bandwidth cover these frequency point, you still can see the peaks.

Hope I am not wrong, at least It seems that I observed that thing before.

On Fri, Apr 26, 2013 at 1:44 PM, Marcus D. Leech <address@hidden> wrote:

On 04/26/2013 02:27 PM, vegihat vegihat wrote:

if i have understand i need to use the --lo-offset of uhd_rx_cfile

i have gave various values to  --lo-offset and only one value has moved the DC offset (--lo-offset=1G) and the plotfft gives many small spikes (maybe this is caused to aliasing, but i am not sure)

which is the rule (value of --lo-offset) to set the DC offset out of my band?

What I do is set my LO offset to about half my bandwidth, so in your case:

--lo-offset 1.0e6

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



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Alex,

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