Hi A lot depends on what sort of result you are looking for.
If a simple calibration of the standard in your counter to +/- 1 ppb is your goal, then a reasonable oscilloscope and some patience will get the job done with what you already have. If continuos lock to GPS at a 10X or 100X tighter level is the goal, it's tough to beat a Thunderbolt at around $100. Most modern gear is looking for a 10 MHz standard input. It's easier to start with 10 and divide for the item that wants 0.1, 1, or 5 MHz than to multiply up from something lower. I would limit my shopping list to OCXO's that already put out 10 MHz and have a voltage control input. There are usually a bunch of them being auctioned in the $50 range. If your accuracy requirement's aren't to tight, you can indeed use a TCXO. If you wait long enough, you probably can score a 10 MHz rubidium for $70 - they make fine GPSDO's .... Regardless of the oscillator used, you will still need some sort of electronics in-between the Res-T and the oscillator. The complexity is up to you. A lot of what you are doing is the same weather you are running a TCXO or a Rb. It all depends on you needs and your budget. Bob On May 1, 2010, at 3:28 PM, [email protected] wrote: > > I'd like to build a GPS disciplined frequency standard. > > I am slowly gathering up pieces. > > I have a Trimble Resolution T GPS card that appears to work, > and an antenna for it. > > I'm thinking now of the oscillator part. > > I have two Racal 1992 counters with the stable oscillator option (probably > 04E since these are former military units). I also have an old Schomandl > ND-100M Frequenzdecade signal source with an (I assume) ovenized oscillator > w/unknown properties. > > I'm wondering if I could use an oscillator from one of these > gizmos instead of shelling out real money on ebay? Speaking of > which, it seems like half the people in China are selling oscillators. > I assume some of them are good for this application and some not > so good? The usual suspects from HP and Agilent are there, and > they seem to command a pretty good (high) price. Which is why > I'm eyeing the Schomandl. > > Chris > w0ep > > > > > _______________________________________________ > 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. > _______________________________________________ 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.
