Hi Matt; Is it possible to include in your application a monitor which would receive a transmission which you could use as a reference in order to correct your transmitter's local oscillator? It seems to me that this would be a better solution to your problem than modifying the hardware in order to inject an external clock.
On Fri, 7 Jan 2011, Matt Robert wrote: > Hi Guys, > > I ran Kalibrate against my pair of USRP1's using GSM900 towers (around > 940MHz) and found my first unit to me 5kHz off and the second was 13kHz off. > > Is this within limits for the built in oscillator? I have been using > them to transmit P25 frames around 435Mhz and found that my commercial > P25 radios will not decode anything coming from the second USRP. The > first USRP works OK. I have swapped around all daughterboards between > both USRPs and the only common factor is the second USRP motherboard so > I am sure its due to the clock in that unit. > > Perhaps clocktamer or a secondhand GPSDO is needed for my Tx applications. > > Cheers, > Matt > Cheers -- Peter F Bradshaw: http://www.exadios.com (public keys avaliable there). Personal site: http://personal.exadios.com "I love truth, and the way the government still uses it occasionally to keep us guessing." - Sam Kekovich. _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
