--- On Tue, 10/8/10, naveen nischal <[email protected]> wrote:
From: naveen nischal <[email protected]> Subject: Re: [Discuss-gnuradio] Spike on USRP 1 To: "Matt Ettus" <[email protected]> Cc: [email protected] 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 <[email protected]> wrote: From: Matt Ettus <[email protected]> Subject: Re: [Discuss-gnuradio] Spike on USRP 1 To: "naveen nischal" <[email protected]> Cc: [email protected] 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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