[time-nuts] Z3801A OCXO manual trimming
paulswedb at gmail.com
Mon Mar 5 15:56:59 EST 2018
Crazy thought.Could you just force a DC offset into the EFC assuming the
internal varicap is not out of range.
It would be simply adding a resistor to pull up or down to see if you can
get a bit of pull and allow the dac to move back in range a bit. Its a band
I know its sort of crazy. But ripping the oven apart really is no fun at
On Mon, Mar 5, 2018 at 11:21 AM, Joe Hobart <nova at npgcable.com> wrote:
> Thank you, Hal, for these links and to others for your comments.
> Setting the oven temperature on a turning point appears tedious. Perhaps
> is enough range in the frequency adjustment to put the oscillator back on
> frequency - or close enough for the EFC to be effective. If not, I may
> have to
> adjust the temperature, but time is limited.
> Some measurements with the EFC disconnected and a calibrated frequency
> 9999.815 KHz at Z3801A turn on
> 9999.9984 KHz highest frequency seen (temperature overshoot)
> 9999.9947 KHz approximate final frequency
> The EFC does have wide range; it can almost pull the 5.3 Hz offset onto
> Thanks again,
> Joe, W7LUX
> > Does the oscillator have an adjustment? If so, is this somewhat
> > without destroying the assembly? Are there pictures of the oscillator
> > assembly?
> time-nuts mailing list -- time-nuts at febo.com
> To unsubscribe, go to https://www.febo.com/cgi-bin/
> and follow the instructions there.
More information about the time-nuts