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.
b...@att.net
www.biwa.cc
K6OQK
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