[ARC5] Fw: ARC-5 Crystal Question

[Dennis Monticelli]

One of the GDO's, the Kenwood version, provided a simple conductive probe
tip that lightly coupled (capacitively vs the usual magnetic coupling) to an
LC that had insufficient external flux such as a torroid.  The stubby probe
plugged into one of the pins of the coil socket.  I think you get more
pulling with this method but for any LC that does not have a significant
external magnetic field (i.e. a torroid, pot core, or crystal blank), this
may be the only way.  Fortunately, a crystal in its holder can be treated as
if it were an inductor and hooked up in lieu of the coil.

Dennis AE6C

On Fri, Aug 13, 2010 at 11:04 PM, Henry Mei'l's <meils at get2net.dk> wrote:

> 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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