EMRFD Message Archive 10947

Message Date From Subject
10947 2015-03-29 18:32:48 Henry OT: Crystals go to war
I thought many would be interested int this video from WW2. Henry WA0GOZ

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Credit: VE7SL - Steve - Amateur Radio Blog

The preparation and manufacture of quartz crystals for radio communications
during World War II.

Thanks to a recent posting in the Yahoo ParasetBuilders Group, I have a
new-found respect for my small collection of prewar crystals! If you've ever
wondered how a rough chunk of quartz gets transformed into an accurate
frequency-generating device, this 'cinema-style' documentary shows exactly
how it was done ... truly an amazingly complex, yet delicate, labor-intensive
process.

After viewing the documentary, I can't help but wonder what later health
effects some of these workers may have undergone after seeing them handling
some nasty-looking chemicals and working directly beside desktop X-ray
machines. If you've used old WW2 crystals before, I think you'll enjoy seeing
how much work went into their production.



http://ve7sl.blogspot.com/2015/03/crystals-go-to-war.html

or

https://www.youtube.com/watch?t=2470&v=b--FKHCFjOM
10950 2015-03-29 20:02:41 Cecil Bayona Re: OT: Crystals go to war
10951 2015-03-29 22:37:47 rodwall1234 Re: OT: Crystals go to war
Hi Henry,

Thanks for the video.

I remember years ago when the novice licence was 1st introduced in Australia. Your transmitter had to be crystal locked. I built up a crystal oscillator to replace the VFO in my transceiver. The crystals I used were the old WWII crystals. Because we could grind them to increase the frequency. Or rub some lead off some solder to reduce the frequency.

Don't know if you know there is a book called "Crystal Clear". It is in the ARRL book shop.

Regards,

Roderick Wall, vk3yc.

Novice call was vk3nkt and limited call was vk3ybr.
Yes I did the 10 words per minute for the full call vk3bko.


"Henry hsknoll@comcast.net [emrfd]" wrote:

 

I thought many would be interested int this video from WW2. Henry WA0GOZ

----------------------------------------------------------

Credit: VE7SL - Steve - Amateur Radio Blog

The preparation and manufacture of quartz crystals for radio communications
during World War II.

Thanks to a recent posting in the Yahoo ParasetBuilders Group, I have a
new-found respect for my small collection of prewar crystals! If you've ever
wondered how a rough chunk of quartz gets transformed into an accurate
frequency-generating device, this 'cinema-style' documentary shows exactly
how it was done ... truly an amazingly complex, yet delicate, labor-intensive
process.

After viewing the documentary, I can't help but wonder what later health
effects some of these workers may have undergone after seeing them handling
some nasty-looking chemicals and working directly beside desktop X-ray
machines. If you've used old WW2 crystals before, I think you'll enjoy seeing
how much work went into their production.

http://ve7sl.blogspot.com/2015/03/crystals-go-to-war.html

or

https://www.youtube.com/watch?t=2470&v=b--FKHCFjOM


Posted by: Henry
10952 2015-03-30 13:09:34 p1eiades Re: OT: Crystals go to war
Very nice, thanks - Joe

10953 2015-03-31 05:19:43 i7swx Re: OT: Crystals go to war
Fhanks very much for the link to the video.

A very interesting story.

I will publish the link on the Italian Radio Rivista and report it to a couple of Ham web newsgroup.

Certainly, today technology to produce xtals is quite different. Is a video availabo about modern quartz production?

73

Gian
I7SWX 
10954 2015-03-31 09:14:48 roumenvelev Re: OT: Crystals go to war
Henry,

Many thanks for this message !

Roumen / LZ3RV
10961 2015-04-06 01:31:58 Stewart Bryant Re: OT: Crystals go to war