[GPS_Standard] My new controller

[Bert, VE2ZAZ]

Hello Edwin,

The assumption here is that your GPS provides a clean and good 1PPS signal.

Looking at the info you provide, I think you forgot to set your VCXO tuning
slope to negative in the Montrol s/w. Double-check this.

As well, it looks like an oscillator that is not centered. If you are
railing at -4.9V and you are 3 Hz high, you will not be able to tune this
oscillator because the EFC (Vtune) pin can only tune +/-1Hz on the 10544.
You must re-adjust the trim-pot.

In Montrol s/w, Disable FLL Operation. Wait until the DAC Value field
becomes accessible. Re-center the DAC Value by typing in 512. Make sure you
press the Enter key after typing in a numerical value. Then adjust your
oscillator potentiometer to bring it back close to nominal frequency. Use
WWV (10MHz) to zero-beat as well. Finally, Enable FLL Operation again and
let it work.

Let me know...

Bert, VE2ZAZ

----- Original Message -----
From: "Edwin B. Walker" <ebwalker614 at earthlink.net>
To: <GPS_Standard at mailman.qth.net>
Sent: Sunday, December 17, 2006 7:37 PM
Subject: [GPS_Standard] My new controller


Bert, as you said there are vast differences in what members of this group
know about the subject.

The output of the HP 10544A is +5 dBm. I had to use R1 (50 ohm) to see any
energy at pin 1 of U-1.

The HP oscillator is 3 hertz high now and the EFC line is -4.9xx VDC.  This
osc.
was pretty much set without the EFC but my counter does not count fractions
of hertz.


After over an hour the "monitor" is now,

FLL = unlocked
Alarm Latch =  Botrail
DAC = 0
Freq. change = none
Change type = none
Sample Freq = 26658
Sample counter = 2
Freq diff  = 32
Holdover = 200

D-2 = extinguished now but is was on for several minutes
D-1 = solid red and blinking


What should I do now?

Ed   WA4DFS


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