[ARC5] Fw: ARC-5 Crystal Question

[Dennis Monticelli]

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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