It depends on the option ordered: the FTS125s we have are FTS125-COO (double OCXO) the -CTV option is the TCXO/VCXO option, there is the -COV option too.
On Wed, Jan 4, 2012 at 10:08 PM, <saidj...@aol.com> wrote: > Hi Ed, > > sorry to hear that, contact me off-list and I will try to solve your > problem. I tried sending you an email, but my mails must be getting > filtered by > your spam filter.. > > bye, > Said > > > In a message dated 1/4/2012 11:33:14 Pacific Standard Time, > ed_pal...@sasktel.net writes: > > On 1/4/2012 11:13 AM, Said Jackson wrote: > > Hi Ed, > > > > Since the oscillator is typically free-running in an NCO, and > periodically corrected by phase drops to stay "on frequency" the error > you are seeing > may be caused be the offset in your crystal, combined with the limited > digital resolution of the NCO trying to correct for this offset. > > > > If this is the case, your measured error would change with temperature. > > > > Does it do that? > > Yes, it does. Cooling the unit by using a heatsink causes a significant > increase in the output frequency. The change is large enough to be > obvious on an oscilloscope where one channel is the 10 MHz from the > Z3801A and the other channel is the 10 MHz from the CW12. > > > If yes, the NCO resolution is not fractionally corrected all the way. > Replacing the on board Tcxo with an ocxo hand-tuned to the correct > frequency > would help, but that sort of defeats the purpose of the product.. > > Yes, it appears that the CW12 is just not appropriate for what I was > thinking of doing. However, to be fair, the 1 PPS output is much better > than the older receivers. I'll have to think about where I go from here. > > Ed > > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.