[time-nuts] Z3801A OCXO manual trimming
Bob kb8tq
kb8tq at n1k.org
Sun Mar 4 23:19:21 EST 2018
Hi
> On Mar 4, 2018, at 10:30 PM, Joe Hobart <nova at npgcable.com> wrote:
>
>
> 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
Yes, if you dig deep enough
> without destroying the assembly?
Depends on how good you are at ripping into things
> Are there pictures of the oscillator assembly?
I believe there are in the archives
>
> Is there an adjustment for temperature?
Yes, by changing the select resistor
> Is this accessible?
Yes, once you have the inside oven board out of the enclosure. Accessible is a
relative term. I would not dig that deep. Others on the list seem to be happy going
that far into the assembly.
Bob
>
> 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.
> _______________________________________________
> time-nuts mailing list -- time-nuts at febo.com
> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.
More information about the time-nuts
mailing list