--- On Tue, 10/8/10, naveen nischal <address@hidden> wrote:
From: naveen nischal <address@hidden>
Subject: Re: [Discuss-gnuradio] Spike on USRP 1
To: "Matt Ettus" <address@hidden>
Cc: address@hidden
Date: Tuesday, 10 August, 2010, 12:10 PM
| Hi Matt,
RF gain used is 20 db.
Thanks, Naveen
--- On Tue, 10/8/10, Matt Ettus <address@hidden> wrote:
From: Matt Ettus <address@hidden>
Subject: Re: [Discuss-gnuradio] Spike on USRP 1
To: "naveen nischal" <address@hidden>
Cc: address@hidden
Date: Tuesday, 10 August, 2010, 10:38 AM
On 08/09/2010 02:40 PM, naveen nischal wrote:
> Hi All,
>
> We have been using the USRP1 with the WBX card on it to communicate with
> the AO-51 satellite. We are expecting to hear from the satellite using
> an Fm Receiver GRC at 435.300
MHz but don't receive anything as yet, we
> are pretty sure about our antenna setup and the GRC are right. The
> problem though is a spurious spike of about 17db which appears at
> whatever center frequency we tune to in the spectrum. we think that this
> might be the problem as that might be jamming the signal which was
> supposed be about the same db level. The point of notice for us is that
> this spike is always there even without the antenna connected. the fft
> is directly the output of the usrp source in the grc so, we are
> presuming that the problem might be in the usrp motherboard .
> Attached is the screenshots FM receiver spectrum. Did anyone have this
> problem? How can we fix it?.
What RF gain are you using? I don't see it on the display.
Matt
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