[time-nuts] UPDATE: DATUM 9390-52054 Grief again...

Burt I. Weiner biwa at att.net
Sun Apr 14 11:20:38 EDT 2013


 From what you're describing, this is what I have, and this could 
explain why I had trouble getting the unit to lock.  Now that I've 
replaced the 10 MHz oscillator, the receiver finds and starts 
tracking satellites within about 3 minutes from an overnight off.

Burt, K6OQK

At 06:24 AM 4/14/2013 someone wrote:
> >         I have an ancient 9390 that has an ancient Trimble GPS board in
> > it that takes a 16.368 reference synthesized from the 10 MHz standard in
> > a PLL loop with a VXCO. This is used in the L band downconversion...
> > and for timing generally and given that is PLL derived from the 10 MHz
> > quite likely if the 10 MHz is significantly wrong the receiver won't
> > find satellites.   I remember I had to fix this PLL in my box before the
> > receiver in that box would lock up... initially the PLL wasn't locked,
> > but the 16.368 VCXO output WAS present  - so for that receiver it has to
> > be pretty close to right on to work.

Burt I. Weiner Associates
Broadcast Technical Services
Glendale, California  U.S.A.
biwa at att.net
www.biwa.cc
K6OQK  



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