[ARC5] More -Whink and crystals.

[wb3fau55 at neo.rr.com]

Dennis, I don't think even Blileys methods  could  move a blank under 1kc.  I have  successfully  fixed underactive FT-243s by just  washing them in  hand soap and drying.   Russ.
---- Dennis Monticelli <dennis.monticelli at gmail.com> wrote: 
> John,
> 
> It is very easy to overshoot when you're looking for sub 1KHz of movement.
>  The WW2 blank as-is usually has a rough surface left from the the final
> grinding operation.  It has many loosely attached pieces of SiO2 which are
> quickly removed by your etching solution.  This in turn rapidly reduces the
> mass of the blank (vs the effect of thinning) and after that you get into
> the harder task of acid etching a well-ordered crystal lattice.  In other
> words the etch rate can be very non-linear in the beginning with these old
> WW2 crystals.  Note this effect if not the result of etch solution
> exhaustion.  In the final year of the war, Bliley's invention of the HF dip
> as the final phase of bringing the blank into the desired frequency largely
> eliminated this behavior and the associated frequency drift in the field
> (as loose particles vibrated free with use).
> 
> BTW if you have a virgin WW2 crystal with low activity, it may be due to
> excess loading of the blank.  You might try a quick dip in your etch bath
> as a "clean" step.  The frequency will probably increase a few hundred Hz,
> but your activity may become markedly better.  I have observed this
> improvement myself, but it only produces the desired result some of the
> time as it depends upon what is causing the low activity in that particular
> rock.
> 
> Dennis AE6C
> 
> 
> On Mon, Aug 5, 2013 at 9:57 AM, John McCarty <jmccarty at alcatel-lucent.com>wrote:
> 
> >
> > How about the round plastic container that electrical tape (3M) comes in??
> >
> > I've been interested in the work that Ken has been doing as I have xtals
> > for frequencies like 8006.76kHz that I want to move to 8.008. It seems
> > Whink works faster on the thinner xtals at higher frequencies. I tried
> > to etch one using the bottom of a MacDonald's coffee cup which has a
> > double thick bottom. I over shot. It's harder to get dead on when
> > multiplying by 18 for two meter rigs.
> >
> >
> > 73
> >
> >
> > John n9hrt
> >
> >
> >
> >
> >
> >
> >
> >
> > On 8/5/2013 11:07 AM, Kenneth G. Gordon wrote:
> >
> >> On 5 Aug 2013 at 10:03, Bill Cromwell wrote:
> >>
> >>  A peanut butter jar seems awfully large for the job.
> >>>
> >> That is MUCH too big.
> >>
> >> Ken W7EKB
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