[time-nuts] FE-.5680A trimming resolution

Attila Kinali attila at kinali.ch
Tue Jan 31 12:37:41 EST 2012


On Tue, 31 Jan 2012 11:46:45 -0500 (EST)
EWKehren at aol.com wrote:

> In a message dated 1/31/2012 10:53:22 A.M. Eastern Standard Time,  
> attila at kinali.ch writes:
> 
> > I  just wonder, whether one could take a GPS module, like the LEA-6T
> > and  replace the TCXO they have with a VCXO that is phase locked
> > to the 10MHz  reference. Or would that cause too much of the hanging
> > bridge  problem?
>
> What do you think you would gain from that. Does the LEA-6T have a  TCXO?
> Bert

Yes, the LEA-*T's have a TCXO. 
I'd expect less jitter in the 1PPS if the oscillator is more stable.
A TCXO has usually something in the range of 10-100ppb/°C temperature
coefficients, while from a OCXO you can expect <10ppb over its whole
temperature range (usually somewhere from 0 to 50°C), ie getting
a temperature coefficient that is in the range of 10 to 100 times better.

			Attila Kinali

-- 
Why does it take years to find the answers to
the questions one should have asked long ago?




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