Hi Fabio,
A few years ago I got one of the programmable FE5680 units. It included
the same small, square board that I can see in your pictures. Only 3
wires: red, black, and orange. My unit didn't have any EFC control.
On a hunch, I checked the orange wire and found that it was the EFC
lead. By disconnecting it and injecting a DC voltage into the main
board, I could adjust the frequency of the oscillator over a range of
about +- 1.5 e-9 (i.e. 1.5 ns on the 1 PPS output) for a 0 - 5 volt input.
Ed
On 12/31/2012 9:45 AM, Fabio Eboli wrote:
Positive update, in the broken unit
the pin 10 goes to power module input,
while the pin 8 goes to power module
ground, and there is grounded.
I powered the good unit and
it locked in few minutes, wothout driving
the EFC, the frequency seem very near
the FE5680 I set against the GPS.
The output 10MHz phase is influenced badly
by input voltage up to 18V, and is
stable after that, so the unit seem
to be a 19-32V one.
Now that the failed unit is still opened,
I will try to check the inner working
voltageon this, if anibody has any question
or curiosity about the units, I still have it
opened up...
Fabio.
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