[time-nuts] Z3801A OCXO manual trimming

Joe Hobart nova at npgcable.com
Sun Mar 4 22:30:11 EST 2018


Mark,

When I press "D" Lady Heather replies:

Manual disciplining not supported by this receiver....press ESC


Questions about the Z3801A:

Does the oscillator have an adjustment?  If so, is this somewhat accessible
without destroying the assembly?  Are there pictures of the oscillator assembly?

Is there an adjustment for temperature?  Is this accessible?

Thanks,
Joe, W7LUX


Lady Heather has a command that lets you set the DAC voltage.  It's in the "D"
menu.   Depending upon the firmware, you may need to disable disciplining first
(also in the "D" menu).  If the DAC  command works to change the OCXO freq,  the
osc EFC and DAC are probably OK.  If it does not, I'd suspect the DAC or the
osc EFC input... or perhaps your firmware does no support the DAC setting command.



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