[ARC5] WHINK and crystals.

[John Hutchins]

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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