[time-nuts] Re: FTS1050 out of range

[JC]

On the off chance that there is a problem with the switch assembly
it might be worth trying to adjust with external control. The manual
specifies a range of 1 to 10 VDC. I've never tried it on my 1150, but
I'd assume that it takes a pretty well regulated DC supply. And, of
course, a lot of patience. Mine has never settled down, which is why
I got it for a song. The GSA FAA sale description stated so, but I
thought maybe it might be something simple. That was 40 years ago.
They were right!

John K0GCJ



On Thu, Feb 23, 2023 at 6:14 PM Tom Knox via time-nuts <
time-nuts at lists.febo.com> wrote:

> Hi
> In the 1050A I looked at recently the 1000B trim pot was not installed.
> Most likely the board is simply unpopulated and the adjustment is done with
> the front panel decades. Not sure if the 1050A decade has the same range as
> the 1000B pot?
> Cheers;
> Tom Knox
> SR Test and Measurement Engineer
> Phoenix Research
> 4870 Meredith Way Apt 102
> Boulder, Co 80303
> Formerly of:
> 357 Fox Lane
> Superior Co 80027
> 303-554-0307
> actast at hotmail.com
>
>
> https://www.thedenverchannel.com/news/marshall-fire/superior-man-moving-forward-after-losing-dream-research-lab-during-marshall-fire
>
> "Peace is not the absence of violence, but the presence of Justice" Both
> MLK and Albert Einstein
> ________________________________
> From: Bob Camp via time-nuts <time-nuts at lists.febo.com>
> Sent: Thursday, February 23, 2023 3:47 PM
> To: Discussion of precise time and frequency measurement <
> time-nuts at lists.febo.com>
> Cc: AC0XU (Jim) <James.Schatzman at ac0xu.com>; Bob Camp <kb8tq at n1k.org>
> Subject: [time-nuts] Re: FTS1050 out of range
>
> Hi
>
> At 0.3 Hz, you are off by 3x10^-8. That’s not very far. Best
> guess is that the unit is doing fine. It simply has aged further
> than the adjustment range. It is fairly common to design an
> OCXO with a range that is adequate for some number of
> years. They do indeed “age out”.
>
> No idea if there is a manual adjust internal to the unit.
>
> Bob
>
> > On Feb 23, 2023, at 8:29 AM, AC0XU (Jim) via time-nuts <
> time-nuts at lists.febo.com> wrote:
> >
> > I have an FTS1050A/015 that is slightly out of range (frequency too high
> by 0.3 Hz with front panel adjustment set to 00000).  Does this indicate
> that something is wrong with the control circuitry or the oscillator, or is
> there an internal gross adjustment that I can use to reset the range?
> >
> > Thanks!
> > _______________________________________________
> > time-nuts mailing list -- time-nuts at lists.febo.com
> > To unsubscribe send an email to time-nuts-leave at lists.febo.com
> _______________________________________________
> time-nuts mailing list -- time-nuts at lists.febo.com
> To unsubscribe send an email to time-nuts-leave at lists.febo.com
> _______________________________________________
> time-nuts mailing list -- time-nuts at lists.febo.com
> To unsubscribe send an email to time-nuts-leave at lists.febo.com
>