[ARC5] Fw: ARC-5 Crystal Question

[J. Forster]

I found out today, VNAs and crystal coupling are discussed in several
issues of QEX.

Does anybody have web access to them?

-John

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


> John,
>
> The less capacitance the better, limited only by the sensitivity of the
> instrument.  I have not tried an actual characterization with a network
> analyzer.  Certainly seems plausible.  I wonder if there are any tips out
> there on the best way to do it.  Perhaps an Agilent app note?
>
> Dennis AE6C
>
> On Sat, Aug 14, 2010 at 1:02 PM, J. Forster <jfor at quik.com> wrote:
>
>> 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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