[ARC5] WHINK and crystals.

[Dennis Monticelli]

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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