[ARC5] Fw: ARC-5 Crystal Question

[Henry Mei'l's]

Wonder if it is then possible to get a dip with an encased xtal placed with 
a large-suface side flush against the top of the GDO coil.
Suppose the thickess of the metal or plastic enclosure plus the air gap 
distance might prevent this  and/or the metal enclosure might decouple.But 
we can always test it out.

Henry, Cph.


----- Original Message ----- 
From: "Dennis Monticelli" <dennis.monticelli at gmail.com>
To: <jfor at quik.com>; "Discussion of AN/ARC-5 military radio equipment." 
<arc5 at mailman.qth.net>
Sent: Saturday, August 14, 2010 6:26 AM
Subject: Re: [ARC5] Fw: ARC-5 Crystal Question


> 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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