Hi Brooke,
The can style should be marked on it. The designation CR41 or 2 is
hanging around the back of my mind. I would have to drag up the few I
have around here somewhere and look at them again.
73BillWB6BNQ
Brooke Clarke wrote:
Hi:
Speaking of old crystals, I found the
Hi
One would assume that the rest of the world also made a few crystals during the
same period.
Bob
On Aug 1, 2013, at 10:41 PM, Charles P. Steinmetz
charles_steinm...@lavabit.com wrote:
pete wrote:
I can't find it but I saw a reference to how may units were made during
WWII, does
On 31/07/13 23:59, Alberto di Bene wrote:
A really fascinating story in pictures of the preparation and
manufacture of quartz crystals for radio communication.
Dating back to 1943... how times have changed...
Copied from another list.
A paper on the effort in WWII and some of the problems
... millions f the unetched units were destroyed...
http://www.ieee-uffc.org/main/history-bottom.asp
On Wed, Jul 31, 2013 at 5:59 PM, Alberto di Bene dib...@usa.net wrote:
A really fascinating story in pictures of the preparation and
Hi
The story of the crystal etching process is true, and Dr. Bottom did play a
part in it. He also spent a *lot* of the next decades publicizing all of that.
Others who were there at the time had slightly different stories to tell, at
least in private.
Bob
On Aug 2, 2013, at 1:10 PM, Pete
Hi
On Aug 2, 2013, at 11:27 AM, Magnus Danielson mag...@rubidium.dyndns.org
wrote:
On 31/07/13 23:59, Alberto di Bene wrote:
A really fascinating story in pictures of the preparation and
manufacture of quartz crystals for radio communication.
Dating back to 1943... how times have
Hi
The X-Ray process does nothing good to the crystal. It's impact is highly
dependent on how dirty the crystal is.
Bob
On Aug 1, 2013, at 4:14 AM, Charles P. Steinmetz
charles_steinm...@lavabit.com wrote:
Alberto wrote:
A really fascinating story in pictures of the preparation and
- Original Message -
From: Charles P. Steinmetz charles_steinm...@lavabit.com
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Sent: Thursday, August 01, 2013 2:52 PM
Subject: Re: [time-nuts] How quartz crystals are (were) fabricated
Bob wrote:
The X-Ray
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] How quartz crystals are (were) fabricated
Bob wrote:
The X-Ray process does nothing good to the crystal. It's impact is
highly dependent on how dirty the crystal is.
Bob,
Do you have authoritative references
Sent: Thursday, August 01, 2013 11:54 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] How quartz crystals are (were) fabricated
Alan wrote:
all crystals would have been subject to X-rays to some extent
because this was how the planes were located
--
Date: Wed, 31 Jul 2013 19:14:58 -0400
From: Bob Camp
2) I'll *guarantee* that the workers in the pictures didn't show up for work on
a normal work day dressed like that.
not be allowed!.
Alan
- Original Message -
From: Charles P. Steinmetz charles_steinm...@lavabit.com
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Sent: Thursday, August 01, 2013 4:54 PM
Subject: Re: [time-nuts] How quartz crystals are (were) fabricated
Alan wrote
I can't find it but I saw a reference to how may units were made during
WWII, does anyone have the number and the reference ?
-pete
On Wed, Jul 31, 2013 at 2:59 PM, Alberto di Bene dib...@usa.net wrote:
A really fascinating story in pictures of the preparation and manufacture
of quartz
Hi:
Speaking of old crystals, I found the crystal in the URC-4 survival radio is
packaged in an axial lead machined metal can.
See Fig. 9 at: http://www.prc68.com/I/URC4.html
or go straight to the photo at:
http://www.prc68.com/I/Images/URC410b.jpg
Does anyone know the package designation and
I don't remember the package designation anymore, but it was common
among navy receivers, such as the URR-27, 33, 35...
-Chuck Harris
Brooke Clarke wrote:
Hi:
Speaking of old crystals, I found the crystal in the URC-4 survival radio is
packaged
in an axial lead machined metal can.
See Fig. 9
See:
http://www.prc68.com/I/Images/URC407b.jpg
Ah, for the days when circuit diagrams were supplied with the unit!
David GM8ARV
--
SatSignal Software - Quality software written to your requirements
Web: http://www.satsignal.eu
Email: david-tay...@blueyonder.co.uk
A really fascinating story in pictures of the preparation and manufacture of
quartz crystals for radio communication.
Dating back to 1943... how times have changed...
Copied from another list.
http://archive.org/details/6101_Crystals_Go_to_War_01_20_16_21
73 Alberto I2PHD
Hi
Some things change, some things don't. A few interesting things:
1) The film was made after they figured out that final etch was a key step.
Earlier in the war - not so much etch.
2) I'll *guarantee* that the workers in the pictures didn't show up for work on
a normal work day dressed like
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