[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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