[ARC5] Fw: ARC-5 Crystal Question

[J. Forster]

This is what I was suggesting:

    ---------------o
VNA ------------------||--=-|
    ---------------o       ===
                   |       === Crystal
                   |--------|

I've not thought about the coupling C size. It might need to be smaller
then 32 pF.

-John

==============


> John,  I understand better now what you were proposing.  The other fellow
> was proposing working with the blank and you were proposing going through
> the holder.
>
> Dennis AE6C
>
> On Sat, Aug 14, 2010 at 6:37 AM, J. Forster <jfor at quik.com> wrote:
>
>> OK. I was just planning to take a coax from the VNA to a small series
>> cap
>> (about 32 pF) and the other side of the C to GND via the crystal.
>>
>> -John
>>
>> ============
>>
>>
>> > Let us know how effectively you can excite a blank using these
>> proposed
>> > methods.  There needs to be a fair amount of coupling to the Z axis of
>> the
>> > AT cut.  The FT-243 and CR-1 holders applied voltage across a narrow
>> air
>> > gap
>> > (capacitance) to both sides of the blank while holding everything in
>> > position with corner pressure points (where there is the least
>> dampening
>> > of
>> > vibration).
>> >
>> > Dennis  AE6C
>> >
>> > On Fri, Aug 13, 2010 at 7:22 PM, J. Forster <jfor at quik.com> wrote:
>> >
>> >> Interesting idea, I was actually thinking of hooking the crystal to a
>> >> modern Vector Netrwork Analyzer with a small cap.
>> >>
>> >> Best,
>> >>
>> >> -John
>> >>
>> >> ==============
>> >>
>> >>
>> >> >
>> >> > On Aug 13, 2010, at 10:55 AM, Henry Mei'l's wrote:
>> >> >
>> >> >> Will just mention that I also have used several GDOs
>> >> >> (Millen, Eico, HB ...) to check xtals- you just bring leads from
>> the
>> >> >> xtal
>> >> >> pins into the GDO's coil socket -
>> >> >
>> >> > AND, if you have only the crystal blank - the raw quartz plate -
>> you
>> >> > balance the plate on top of the dipper coil, or lean it agains the
>> >> > side of the coil and tune away. You are likely to get a nice dip at
>> >> > the resonant frequency of the plate.
>> >> >
>> >> > Roy
>> >> >
>> >> > Roy Morgan
>> >> > k1lky at earthlink.net
>> >> > K1LKY Since 1958 - Keep 'em Glowing!
>> >> >
>> >> >
>> >> >
>> >> > ______________________________________________________________
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>> >>
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>>
>>
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