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Re: [Discuss-gnuradio] Peak in FFT.


From: Karthik
Subject: Re: [Discuss-gnuradio] Peak in FFT.
Date: Fri, 6 Nov 2009 18:51:10 -0800

On Thu, Nov 5, 2009 at 10:25 PM, Matt Ettus <address@hidden> wrote:
> Kóczián Gergely wrote:
>>
>> Hi all!
>>
>> I use my usrp without antenna. I just want to meassure the noise but,
>> at 0Hz has always a peak.
>>
>> I saw that, this was a probleme in the past also, but i didn't found
>> the solution.
>>
>> Attached picture:
>>
>> http://img4.imageshack.us/img4/2493/messung11.png
>>
>> What did I wrong?
>
> What daughterboard are you using?
>
> Matt
>

>From the attached screen shot it looks like you are using a LFRX
daughterboard. Do you have 50ohm output impedance from your source?
You can try terminating your channel with a 50ohm terminator and see
if the peak goes away.

Karthik




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