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Re: [Discuss-gnuradio] GPS with DBSRX, Almost There

From: Peter Monta
Subject: Re: [Discuss-gnuradio] GPS with DBSRX, Almost There
Date: Tue, 06 Mar 2007 23:39:33 -0800
User-agent: Thunderbird (X11/20070212)

Martin Dvh wrote:

Maybe you could inject a stable frequency near the wanted RX frequency.
Say a few Mhz away from the 1.57542e9 you want to receive.
Then you could use this in the output to remove the jitter and LO drift.

for example:
inject 1600000000 Mhz  (=25 harmonic of 64MHz) at the input (after the saw 
This will result in 24.58 Mhz +jitter +LOdrift at the input of the USRP (after 
dbs_rx downmix)

I wonder if any 25th harmonic is already in the signal, by virtue
of leakage within the USRP itself?  That would be great.

Peter Monta

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