[ARC5] WHINK and crystals.

[Dennis Monticelli]

True, though they are much smaller than your typical 8" reticule.


On Fri, Jun 28, 2013 at 9:19 AM, J. Forster <jfor at quikus.com> wrote:

> Optical flats, used w/ LASERs are probably a whole lot flatter. They are
> often good to 1/100th of a wavelength of roughly 500 nM light, or 5 nM.
>
> They are pretty expensive though. Think $300 for a 1" OD, 1" thick one.
>
> You can sometimes be picked up cheap on eBay.
>
> -John
>
> =================
>
>
>
>
> > Good input, Hutch.
> >
> > There is NOTHING flatter than a glass reticule.  We're talking microns.
> >  These are very hard to find, even here in Si valley among all the
> surplus
> > shops.  The reason is not just recycling, it has more to do with the fact
> > that these masks represent the IC design itself and all such information
> > is
> > deemed highly proprietary.  Hence this stuff just does not end up in the
> > surplus channels.
> >
> > Dennis AE6C
> >
> >
> >
> >
> > On Fri, Jun 28, 2013 at 8:21 AM, John Hutchins
> > <jphutch60bj at gmail.com>wrote:
> >
> >> Group -
> >>
> >> This is good information,  is the procedures and materials and process
> >> document existing on a web page?
> >> Can the whole process be summarized?  If so since radio sites go up and
> >> down, same as with "yahoo group participation" could this be a Wikipedia
> >> page?
> >> On the subject of Glass:
> >> Glass plate you say,  find if you can;  glass used in making IC chips
> >> called a reticule;  This is very hard and thick glass, flatter than the
> >> world before Columbus!
> >> They used be very common and were discarded all the time;  Now reticule
> >> glass is recycled, but you may still have some sources out there.
> >> Hutch
> >>
> >>
> >> On 6/28/2013 8:55 AM, J. Forster wrote:
> >>
> >>> The guy used a mirror, probably because it was a cheap 'optical flat'.
> >>> Ande distortions are readily noticeable. Today, with 'float glass'
> >>> probably any glass plate from a hardware store will work...  thye
> >>> thicker
> >>> the better.
> >>>
> >>> As to grinding medium, fine gvrinding powder for amateur telescope
> >>> makers
> >>> is worth a try. It comes is a wide variety of grits, from gravel to
> >>> rouge.
> >>>
> >>> -John
> >>>
> >>> ================
> >>>
> >>>
> >>>
> >>>
> >>>  Gentlemen,
> >>>>
> >>>> For whatever it may be worth, I had occasion to observe a fellow radio
> >>>> amateur and CAP communications person who regularly ground crystals.
> >>>> I
> >>>> recall that he would accumulate a large number of FT-243 crystals of
> >>>> varying frequency and put them on the CAP frequency of 4585 kHz.  He
> >>>> did
> >>>> a combination of lapping and etching.  I recall that he used a
> >>>> heavy-duty mirror surface for lapping.  The one thing I also recall
> >>>> was
> >>>> that, for periodic testing, he used two electrodes (sic) from an
> >>>> FT-243
> >>>> holder with leads attached and held the thing together with a stout
> >>>> wooden close-pin. This was wired into an oscillator which, in turn was
> >>>> hetrodyned with a BC-221 into a receiver (Remember, this was in
> >>>> probably
> >>>> 1959).  Apparently, the pressure was what was need to emulate the
> >>>> pressure the holder would provide.  He made crystals for CAP for
> >>>> probably 20-plus years with very good success.  I recall the
> >>>> "figure-8"
> >>>> pattern he'd use to lap/grind the crystals.  I do not know the
> >>>> chemicals
> >>>> nor compounds he used, but suspect it what you all mention, here.  I
> >>>> may
> >>>> give it a try as I have some crystals near 3885 that are within
> >>>> reasonable distance down the band.  We'll see!
> >>>>
> >>>> Jeep K3HVG
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