In article , Bill Janssen
writes
Steve Nosko wrote:

"H. Peter Friedrichs" wrote in message
hlink.net...


Hello, All:

Rumor has it that QST featured an article in a January/1930 or


January/1935


issue on the subject of homebrew transmitter crystals - how cut, lap, and
mount them. If anyone has QST on CDROM for those years, I'd sure


appreciate


if you could take a look.
Remove XXX's and ZZZ's if you wish to reply directly, and thanks.
Pete
AC7ZL




Pete,

I have my Dad's grinding stuff, but don't do it. One thing to keep in
mind, and I don't know the details, but remember that the crystal activity
is effected by the edges. Grinding the edges is one of the more esoteric
aspects.


The trick isn't the edges but keeping the two surfaces parallel and
flat. The procedure is to grind a little
and check the activity. If it is down try to grind the center or edges
and check again. If it gets better
then go back to to grinding and trying to keep it flat.

Anyway that is the method I used.

Bill K7NOM

Large pieces of natural quartz usually from Brazil are getting rare as
quarts gravel/pebbles are now used as feed material for re-growth on a
seed plate in autoclaves.
If large slices in the Y direction are required (SAW DELAY LINES) growth
in this direction is so slow that the seed has to be from a slice of
natural.
Hence big natural pieces are valuable.


--
ddwyer