[time-nuts] Inside of FT1200-100
ed_palmer at sasktel.net
Wed Nov 23 21:02:17 EST 2016
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.
On 2016-11-23 5:04 PM, Christopher Hoover <ch at murgatroid.com> wrote:
> Subject: Re: [time-nuts] Inside of FT1200-100
> <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>
>> >Part number decoder on page 4 of:
>> >CY = glass
>> >06 = case size
>> >C = operating temp (-55 C to +125 C)
>> >240 = 24 pF
>> >J = tolerance (+/- 5%)
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