"Bill Janssen" wrote in message
...
Steve Nosko wrote:
I was not referring to the outer reaches of the two large faces as in; is
the face flat or curved in some way.

I understood what you meant. Just never considered that important. Maybe
that is something I missed.
Bill K7NOM


Unfortunately, Dad went in the blink of an eye. I'm glad for him, but I
didn't have the chance to talk, ask questions or say goodby.

--
Steve N, K,9;d, c. i My email has no u's.

H. Peter Friedrichs wrote:

Michael,

I'm interested in "extreme" homebrew for its own sake. I simply like it.

http://www.mindspring.com/~pfriedr/b...ry/gallery.htm
http://www.mindspring.com/~pfriedr/b...ry/gallery.htm


Very enjoyable Site, Peter!


- Mike KB3EIA -

H. Peter Friedrichs wrote:

Michael,

I'm interested in "extreme" homebrew for its own sake. I simply like it.

http://www.mindspring.com/~pfriedr/b...ry/gallery.htm
http://www.mindspring.com/~pfriedr/b...ry/gallery.htm


Very enjoyable Site, Peter!


- Mike KB3EIA -

In article , Mike Coslo
writes
H. Peter Friedrichs wrote:

Michael,

I'm interested in "extreme" homebrew for its own sake. I simply like it.

http://www.mindspring.com/~pfriedr/b...ry/gallery.htm
http://www.mindspring.com/~pfriedr/b...ry/gallery.htm


Very enjoyable Site, Peter!


- Mike KB3EIA -

I was in the Xtal business for 20 years so can answer individual
questions.
WWII and before Xtals were flat plates and vibrated to the edges in "air
gap" holders.
after 1950s centre plated crystals were ideally dead at the edges.
If you want to lap frequencies up a VCO tuned comms receiver can pick up
the broad band noise generated and centered on the crystal frequency.
Above assume shear mode AT type or Z cut plates.

--
ddwyer

In article , Mike Coslo
writes
H. Peter Friedrichs wrote:

Michael,

I'm interested in "extreme" homebrew for its own sake. I simply like it.

http://www.mindspring.com/~pfriedr/b...ry/gallery.htm
http://www.mindspring.com/~pfriedr/b...ry/gallery.htm


Very enjoyable Site, Peter!


- Mike KB3EIA -

I was in the Xtal business for 20 years so can answer individual
questions.
WWII and before Xtals were flat plates and vibrated to the edges in "air
gap" holders.
after 1950s centre plated crystals were ideally dead at the edges.
If you want to lap frequencies up a VCO tuned comms receiver can pick up
the broad band noise generated and centered on the crystal frequency.
Above assume shear mode AT type or Z cut plates.

--
ddwyer

ddwyer wrote:

In article , Mike Coslo
writes


H. Peter Friedrichs wrote:



Michael,

I'm interested in "extreme" homebrew for its own sake. I simply like it.

http://www.mindspring.com/~pfriedr/b...ry/gallery.htm
http://www.mindspring.com/~pfriedr/b...ry/gallery.htm


Very enjoyable Site, Peter!


- Mike KB3EIA -



I was in the Xtal business for 20 years so can answer individual
questions.
WWII and before Xtals were flat plates and vibrated to the edges in "air
gap" holders.
after 1950s centre plated crystals were ideally dead at the edges.
If you want to lap frequencies up a VCO tuned comms receiver can pick up
the broad band noise generated and centered on the crystal frequency.
Above assume shear mode AT type or Z cut plates.



The Crystal grinding shop in the Washington DC Navy Yard (1947) had a
National HRO receiver
connected to the rough grinding machine. They picked up the noise to
tell how near to the finished
frequency they were. They then went to hand grinding to finish.

I have a chunk of Quartz from that shop.

Bill K7NOM

ddwyer wrote:

In article , Mike Coslo
writes


H. Peter Friedrichs wrote:



Michael,

I'm interested in "extreme" homebrew for its own sake. I simply like it.

http://www.mindspring.com/~pfriedr/b...ry/gallery.htm
http://www.mindspring.com/~pfriedr/b...ry/gallery.htm


Very enjoyable Site, Peter!


- Mike KB3EIA -



I was in the Xtal business for 20 years so can answer individual
questions.
WWII and before Xtals were flat plates and vibrated to the edges in "air
gap" holders.
after 1950s centre plated crystals were ideally dead at the edges.
If you want to lap frequencies up a VCO tuned comms receiver can pick up
the broad band noise generated and centered on the crystal frequency.
Above assume shear mode AT type or Z cut plates.



The Crystal grinding shop in the Washington DC Navy Yard (1947) had a
National HRO receiver
connected to the rough grinding machine. They picked up the noise to
tell how near to the finished
frequency they were. They then went to hand grinding to finish.

I have a chunk of Quartz from that shop.

Bill K7NOM

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

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