Bill, A generator like the HP 8640B would be tunable like you want, since it's a continuous mechanically tuned cavity. However, to get into reading millihertz, you would need an accraute counter to measure the output of the generator. The problem is, most counters are 8 digits in resolution, and at say 10 MHz, you would only be able to read down to 1 Hz (10.000001). Also, in this case, you would want the signal to be as clean as possible IMO. There wouldn't be any need to buy something real expensive, unless that's what you're looking for, to use on other projects later on.
Best, Will *********** REPLY SEPARATOR *********** On 7/12/2011 at 9:04 PM Bill Dailey wrote: >Ok, I have a dds receiver locked to a gpsdo, the radio can only be tuned in 1 hz increments but should be dead on. I can feed the passband into speclab via VAC and measure a carrier OTA. No problem there...can get decent resolution but there is some uncertainty with regard to the dds (frequent dependent). What I would like do is inject a known frequency to either zero-beat the carrier (assuming I can get something with millihertz resolution) or provide a non-superimposed carrier that I can reference via difference in speclab. The whole point is to eliminate or measure the dds offset at a particular frequency. > > >_______________________________________________ >time-nuts mailing list -- [email protected] >To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >and follow the instructions there. > >__________ Information from ESET Smart Security, version of virus signature database 5851 (20110206) __________ > >The message was checked by ESET Smart Security. > >http://www.eset.com _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
