[time-nuts] Inside of FT1200-100

[Ed Palmer]

What value are you going to change it to?

Since the frequency is too low, you probably have to reduce the 
capacitance somewhere.  This one is only 24 pf 5% tolerance.  It seems 
unlikely that this by itself is setting the frequency.  It's rather 
small and the tolerance is rather large.  Is there another larger 
capacitor in parallel with this one?  This one might be the 'trimmer' 
they used to get the frequency within adjustment range. I've seen that 
idea used in my Sulzer 2.5  and Oscilloquartz 8601 - which both use the 
AVX glass capacitors, by the way!  If this is the 'trimmer', then just 
remove it.  That worked for my 8601.  I removed 91 pf that was in 
parallel with 1200 pf to raise the frequency enough to bring it back 
within adjustment range.

Ed

On 2016-11-23 5:04 PM, Christopher Hoover <ch at murgatroid.com> wrote:
> Subject: Re: [time-nuts] Inside of FT1200-100
> Message-ID:
> 	<CACw0PsbZQaGoqFhbqBpLrU6+VR0MRtx_aR1bu00yDFokKW8FuQ at mail.gmail.com>
> Content-Type: text/plain; charset="utf-8"
>
> And of course it is a discontinued part.
>
> Taking suggestions for a replacement.   COG(NP0)?
>
>
> On Wed, Nov 23, 2016 at 12:25 PM, Christopher Hoover<ch at murgatroid.com>
> wrote:
>
>> >Part number decoder on page 4 of:
>> >
>> >http://www.mouser.com/catalog/supplier/library/pdf/AVXGlassDielectric.pdf
>> >
>> >CY = glass
>> >06 = case size
>> >C = operating temp (-55 C to +125 C)
>> >240 = 24 pF
>> >J =  tolerance (+/- 5%)
>> >