Re: [Discuss-gnuradio] Peak in FFT.

[Kóczián Gergely]

Yes I use LFRX.

Thanks the suggestion, i will try.

2009/11/7 Karthik <address@hidden>:
> 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
>