[ARC5] Fw: ARC-5 Crystal Question

[Dennis Monticelli]

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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