Re: [time-nuts] HP-103AR frequency beyond adjustment

[Jeremy Nichols]

Thanks, Charles. I'll give it a try. Wanted to ask before attempting what
will be for me a new procedure.

I suppose I could also try replacing C117, the Fine Frequency Adjust
capacitor, to see if that has any effect. C117 is a 6.8-99 pf variable
geared to a shaft revolution counter. The counter is at maximum (600) but
the manual doesn't say if that is at the minimum or maximum end of the
capacitance.

I have the manual (got a copy from Artek) and read the oven temp procedure.
Tedious but do-able.

Jeremy


On Thu, Sep 28, 2017 at 5:50 AM Charles Steinmetz 
wrote:

> Jeremy wrote:
>
> > The only thing I've not adjusted is the oven temperature.
> > I know there's been discussion of this subject here in the
> > past but my searches come up empty—I must be using the wrong keywords.
> > The 103AR is just a toy for me so no harm is done if the frequency can't
> be
> > raised to 1 MHz but if it's possible I'd like to try. Have I missed
> something
> > somewhere?
>
> To adjust the frequency trim range, replace selected capacitor C103
> inside the oven (nominally 18pF).  Use a C0G/NP0 ceramic.  Note that HP
> indicates this "Component [is] not separately replaceable."  But at this
> point (nearly 60 years on), opening sealed oven assemblies has become
> routine for those who maintain old HP standards.
>
> The procedure for adjusting the oven temperature is described in
> paragraph 8-11 of the operating and service manual 01037-2 (printed Jan
> 1962).  Be advised it is somewhat tedious.
>
> If you do not have the manual, you can download it here:
>
> <
> http://www.ko4bb.com/getsimple/index.php?id=download=HP_Agilent/HP_103AR_quartz_oscillator_op_service_manual_1962.pdf
> >
>
> Best regards,
>
> Charles
>
>
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Re: [time-nuts] HP-103AR frequency beyond adjustment

[Charles Steinmetz]

Jeremy wrote:


The only thing I've not adjusted is the oven temperature.
I know there's been discussion of this subject here in the
past but my searches come up empty—I must be using the wrong keywords.
The 103AR is just a toy for me so no harm is done if the frequency can't be
raised to 1 MHz but if it's possible I'd like to try. Have I missed something
somewhere?


To adjust the frequency trim range, replace selected capacitor C103 
inside the oven (nominally 18pF).  Use a C0G/NP0 ceramic.  Note that HP 
indicates this "Component [is] not separately replaceable."  But at this 
point (nearly 60 years on), opening sealed oven assemblies has become 
routine for those who maintain old HP standards.


The procedure for adjusting the oven temperature is described in 
paragraph 8-11 of the operating and service manual 01037-2 (printed Jan 
1962).  Be advised it is somewhat tedious.


If you do not have the manual, you can download it here:



Best regards,

Charles


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[time-nuts] HP-103AR frequency beyond adjustment

[Jeremy Nichols]

My HP-103AR has drifted beyond the ability of the "coarse" and "fine"
frequency adjustment capacitors. The 1 MHz output measures 0.999 9992 MHz
and will not go higher. The only thing I've not adjusted is the oven
temperature. I know there's been discussion of this subject here in the
past but my searches come up empty—I must be using the wrong keywords. The
103AR is just a toy for me so no harm is done if the frequency can't be
raised to 1 MHz but if it's possible I'd like to try. Have I missed
something somewhere?

Jeremy

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