[ARC5] Fw: ARC-5 Crystal Question

[J. Forster]

That was my initial thought, a gimmic, but apparently it's been done and
is written up in QEX. I've not see the article as yet.

-John

===========


> John and Dennis,
>
> Why not use an adjustable capacitor for coupling cap.C for minimum but
> usable coupling?.
>
> Henry, Cph.
>
> ----- Original Message -----
> From: "J. Forster" <jfor at quik.com>
> To: "Dennis Monticelli" <dennis.monticelli at gmail.com>
> Cc: "Discussion of AN/ARC-5 military radio equipment."
> <arc5 at mailman.qth.net>
> Sent: Monday, August 16, 2010 6:14 AM
> Subject: Re: [ARC5] Fw: ARC-5 Crystal Question
>
>
>>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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>>
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