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Sci.Electronics.Basics -> Si-diodes in Second World War radar & Communication equipment
There are 103 messages in this thread.
You are currently looking at messages 20 to 40.
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Author: NeodymiumDate: 15:41 13-04-08
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> I thought at that point in time, practical diodes were all germanium
> point contact types, at least the ones used for RF detection. But I
> see from some web searching that I was wrong about that. The series
> of articles at this site may be interesting:
> http://www.computerhistory.org/semiconductor/timeline/1940-Discovery.html.
> That page mentions that the P-N junction was discovered by a
> researcher using purified silicon in 1940. Robert Buderi's book, "The
> Invention that Changed the World: How a small group of radar pioneers
> won the Second World War and launched a technological revolution,"
> might be a good place to do some research too. I'd have a look in it
> to see what he says about silicon diodes, but my copy is at my office
> at the moment.
Thanks for this link, hadn't seen this site before! Excellent info!
> Quartz crystals for frequency control were used somewhat before that.
> This paper: http://www.ieee-uffc.org/fc_history/bottom.html says that
> a piece of quartz was used to control the frequency of an oscillator
> in 1919. Perhaps that is the first. I know there was a lot of
> interest in quartz crystals among amateur radio operators/builders in
> the 1930's. If you can find copies of QST or other ham magazines from
> that era, I'll bet you can find articles about quartz crystals.
I knew that one. I also bought a number of old magazines on eBay with
atricles about piezoelectronic quartz crystals.
WW-II info on diodes has been more difficult so far.
Thanks!
Ronald
Norway
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Author: NeodymiumDate: 15:41 13-04-08
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"Don Bowey" <dbowey@comcast.net> skrev i melding
news:C42650B2.B518B%dbowey@comcast.net...
> On 4/12/08 9:31 AM, in article
> KqmdnRpvIuJgfp3VnZ2dnUVZ_hGdnZ2d@earthlink.com, "Michael A. Terrell"
> <mike.terrell@earthlink.net> wrote:
>
>>
>> John Fields wrote:
>>>
>>> On Sat, 12 Apr 2008 17:51:10 +0200, "ronwer"
>>> <neo.dymium.removethisfirst@dontwantspam.yahoo.com> wrote:
>>>
>>>> Hi!
>>>>
>>>> I am doing a study into the early use of silicon diodes in radar and
>>>> communication equipment during the Second World War.
>>>>
>>>> What I would be interested in is as follows:
>>>>
>>>> -type numbers of the diodes
>>>
>>> ---
>>> 1N23 is a good place to start.
>>
>>
>> I still have one, wrapped in the lead foil that was surplused from
>> some earlier WE microwave relay equipment. From the looks of it, it was
>> probably made for 'White Alice'.
>>
>
> In which case it was likely used in the FPS19 radar or/and the Tropo
> systems
> if my memory isn't fractured. But the early Projects were begun in the
> 50s.
>
> John's post reprogrammed my erroneous thought that the 1N23 is germanium.
> It is the 1N21 that is germanium, and likely existed in the 40s.
I googled for 1N23, some say germanium, others silicon...
But you are sure it IS silicon!?
One datasheet I found was in Japanese/Chineze, and the other didn't mention
Si/Ge at all. Max f=9,325 GHz
It's hard surfing effectively with only 56 kbs at a hilltop far from the
civilized world.
At Wikipedia they said germanium:
http://en.wikipedia.org/wiki/RMA_tube_designation
I am out on a job, but when I get back in Mai I can check my own sample with
a multimeter, that will give a result.
Ronald
Norway
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Author: Richard HenryDate: 16:40 13-04-08
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On Apr 12, 11:45=A0am, Richard Henry <pomer...@hotmail.com> wrote:
> On Apr 12, 9:51=A0am, "Michael A. Terrell"
<mike.terr...@earthlink.net>
> wrote:
>
>
>
>
>
> > "Michael A. Terrell" wrote:
>
> > > John Fields wrote:
>
> > > > On Sat, 12 Apr 2008 17:51:10 +0200, "ronwer"
> > > > <neo.dymium.removethisfi...@dontwantspam.yahoo.com> wrote:
>
> > > > >Hi!
>
> > > > >I am doing a study into the early use of silicon diodes in radar
an=
d
> > > > >communication equipment during the Second World War.
>
> > > > >What I would be interested in is as follows:
>
> > > > >-type numbers of the diodes
>
> > > > ---
> > > > 1N23 is a good place to start.
>
> > > =A0 =A0I still have one, wrapped in the lead foil that was surplused f=
rom
> > > some earlier WE microwave relay equipment. From the looks of it, it wa=
s
> > > probably made for 'White Alice'.
>
> > =A0 =A0Actually, I think it is a 1N21.
>
> > =A0 =A0Here is a web page selling some of the early microwave diodes:htt=
p://www.sphere.bc.ca/test/rf-diodes.html
>
> > --
> > aioe.org is home to cowards and terrorists
>
> > Add this line to your news proxy nfilter.dat file
> > * drop Path:*aioe.org!not-for-mail to drop all aioe.org traffic.
>
> >http://improve-usenet.org/index.html
>
> > Use any search engine other than Google till they stop polluting USENET
> > with porn and junk commercial SPAM- Hide quoted text -
>
> > - Show quoted text -
>
> I don't have all the volumes of the Radiation Lab series. =A0Is this
> covered in there anywhere?- Hide quoted text -
>
> - Show quoted text -
After a little research, I found that the entire RadLab series was
converted to CDs some time ago. However, I haven't anywhere to buy
them.
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Author: Michael A. TerrellDate: 16:43 13-04-08
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Neodymium wrote:
>
> I googled for 1N23, some say germanium, others silicon...
>
> But you are sure it IS silicon!?
>
> One datasheet I found was in Japanese/Chineze, and the other didn't mention
> Si/Ge at all. Max f=9,325 GHz
>
> It's hard surfing effectively with only 56 kbs at a hilltop far from the
> civilized world.
>
> At Wikipedia they said germanium:
>
> http://en.wikipedia.org/wiki/RMA_tube_designation
>
> I am out on a job, but when I get back in Mai I can check my own sample with
> a multimeter, that will give a result.
Be careful. Those early diodes were very fragile. They were easy to
damage with static, or over current. The military had a special test
set for them. You might luck out and find the schematic online. The link
I posted in another message had the Test Set model number TS-286C/U
listed.
http://www.avtechpulse.com/faq.html/ might be of interest, as well.
http://prola.aps.org/abstract/RMP/v67/i2/p397_1
--
aioe.org is home to cowards and terrorists
Add this line to your news proxy nfilter.dat file
* drop Path:*aioe.org!not-for-mail to drop all aioe.org traffic.
http://improve-usenet.org/index.html
Use any search engine other than Google till they stop polluting USENET
with porn and junk commercial SPAM
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Author: John LarkinDate: 17:29 13-04-08
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On Sun, 13 Apr 2008 21:27:04 +0200, "Neodymium" <neo.dymium@yahoo.com>
wrote:
>> Volume 15 of the MIT RadLab books, "Crystal Rectifiers" 440 pages, is
>> all about that. History, theory, parts, applications. Appendix D lists
>> the common mixer types. The history part mentions early mineral-based
>> rectifiers.
>>
>> Some interesting sections are one which notes that some diodes have
>> power gain when used as mixers, and a suggestion that semiconductor
>> triodes should be possible, and some interesting 100-volt
>> welded-junction "power" diodes.
>>
>> Volume 16, "Microwave Mixers" has some more stuff.
>>
>> These books show up on ebay, or a used-book thing like Alibris.
>
>OK, thanks for the titles, will definitely look for them on eBay or Amazone.
>Alibris is new to me, but I'll check.
>
>
>> I think Bliley Corp may have some papers on the history of quartz
>> crystals. They, along with the point-contact diode, helped to win the
>> war.
>
>I will definitely try Bliley!
>
>But otherwise, yes, that is one of the important issues I want to document:
>to what extent where these components decisive for the outcome of the war.
>Interesting stuff, good for the museum expositions I am working on!
>
>Ronald
>Norway
>
Also look into mica capacitors, and the use of mica as structural
insulators in vacuum tubes and as a filler in phenolic sockets and
such. Mica is unique: it's a good dielectric, a great high-temperature
insulator and support, and naturally fractures into high-quality
transparant sheets of nearly any desired thickness, yet is easily
sheared and punched.
John
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Author: john jardineDate: 18:23 13-04-08
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"Neodymium" <neo.dymium@yahoo.com> wrote in message
news:io6dneeyupGL_5_VRVnzvQA@telenor.com...
> > I thought at that point in time, practical diodes were all germanium
> > point contact types, at least the ones used for RF detection. But I
> > see from some web searching that I was wrong about that. The series
> > of articles at this site may be interesting:
> >
http://www.computerhistory.org/semiconductor/timeline/1940-Discovery.html.
> > That page mentions that the P-N junction was discovered by a
> > researcher using purified silicon in 1940. Robert Buderi's book, "The
> > Invention that Changed the World: How a small group of radar pioneers
> > won the Second World War and launched a technological revolution,"
> > might be a good place to do some research too. I'd have a look in it
> > to see what he says about silicon diodes, but my copy is at my office
> > at the moment.
>
>
> Thanks for this link, hadn't seen this site before! Excellent info!
>
>
> > Quartz crystals for frequency control were used somewhat before that.
> > This paper: http://www.ieee-uffc.org/fc_history/bottom.html says that
> > a piece of quartz was used to control the frequency of an oscillator
> > in 1919. Perhaps that is the first. I know there was a lot of
> > interest in quartz crystals among amateur radio operators/builders in
> > the 1930's. If you can find copies of QST or other ham magazines from
> > that era, I'll bet you can find articles about quartz crystals.
>
> I knew that one. I also bought a number of old magazines on eBay with
> atricles about piezoelectronic quartz crystals.
>
> WW-II info on diodes has been more difficult so far.
>
> Thanks!
>
> Ronald
> Norway
>
>
I've a R1359 UHF receiver. It formed part of the UK's 'Home chain' radar
network. Tuning is via a diode stuck in the end of what looks a circular
Lecher line.
Diode is marked with the military designation 'CV364' and is same package as
the IN23 series. I never found any data on this diode but for curiosity took
it out and measured it. Germanium!.
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Author: JoergDate: 21:25 13-04-08
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Joerg wrote:
> ronwer wrote:
>>> Probably you could start by finding information about this gear but
>>> there would have to be someone on the team who can understand German:
>>>
http://www.100-jahre-radar.de/index.html?/gdr_5_deutschefunkmesstechnikim2wk.html
>>>
>>>
>>> Many such sites have links to British and American gear but often
>>> also in German. Another option are senior centers. A few of the EEs
>>> from those days are still alive but there won't be much time left.
>>>
>>> --
>>> Regards, Joerg
>>
>>
>> Thanks! I will check this out. German is no problem whatsoever!
>>
>> Best regards,
>>
>> Ronald
>> Norway
>
> Ah, Norway. Then you might even find some WW-II veterans from the German
> side. I've met a few when I was younger. Some had been stationed there
> and liked it so much that they later moved to Scandinavia or bought a
> summer house there. One friend of mine would have known a lot about
> these Radars but unfortunately he passed away. He went on vacation to
> Norway pretty much every year.
>
> In contrast to today the guys at the sites were intimately familiar with
> the circuitry because they had to repair this stuff on the component level.
>
Here is another link for you. Looks like the first patent for a silicon
diode was issued in 1906. That blew me away. Starts at page 7:
http://assets.cambridge.org/052183/5267/sample/0521835267ws.pdf
--
Regards, Joerg
http://www.analogconsultants.com/
"gmail" domain blocked because of excessive spam.
Use another domain or send PM.
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Author: Barry LennoxDate: 22:13 13-04-08
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On Sat, 12 Apr 2008 17:51:10 +0200, "ronwer"
<neo.dymium.removethisfirst@dontwantspam.yahoo.com> wrote:
>Hi!
>
>I am doing a study into the early use of silicon diodes in radar and
>communication equipment during the Second World War.
>
>What I would be interested in is as follows:
>
>-type numbers of the diodes
>-name/type number of radar/communication equipment
>-technical infor on those systems
>-info on producers
>-pictures of actual diodes, also "in" the circuits
>-anecdotal stories about the actual use
>-anything else!
As mentioned by another, Vol 15 and 16 of the Radlab series has a lot
of what you will be after. But also check out the Vol 17: "Components
handbook" that also has a fair amount on diodes.
Also, look at "A History of Engineering and Science in the Bell
System1925-1975" There are 6 volumes, ranging from 360 to about 1000
pages, and they all cover diodes to some extent.
The RSGB "Technical Topics" scrapbooks (there's now 4) compiled by
G3VA, Pat Hawker, also mentions WW2 equipments and components in many
places. He was initially a VI, then joined Special Comms and SOE
during the war.
I also had an interesting book by Philips back in the 60's on diodes,
long gone now tho!
Barry
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Author: Don BoweyDate: 22:30 13-04-08
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On 4/13/08 12:41 PM, in article io6dneayupGK_5_VRVnzvQA@telenor.com,
"Neodymium" <neo.dymium@yahoo.com> wrote:
>
> "Don Bowey" <dbowey@comcast.net> skrev i melding
> news:C42650B2.B518B%dbowey@comcast.net...
>> On 4/12/08 9:31 AM, in article
>> KqmdnRpvIuJgfp3VnZ2dnUVZ_hGdnZ2d@earthlink.com, "Michael A. Terrell"
>> <mike.terrell@earthlink.net> wrote:
>>
>>>
>>> John Fields wrote:
>>>>
>>>> On Sat, 12 Apr 2008 17:51:10 +0200, "ronwer"
>>>> <neo.dymium.removethisfirst@dontwantspam.yahoo.com> wrote:
>>>>
>>>>> Hi!
>>>>>
>>>>> I am doing a study into the early use of silicon diodes in radar
and
>>>>> communication equipment during the Second World War.
>>>>>
>>>>> What I would be interested in is as follows:
>>>>>
>>>>> -type numbers of the diodes
>>>>
>>>> ---
>>>> 1N23 is a good place to start.
>>>
>>>
>>> I still have one, wrapped in the lead foil that was surplused from
>>> some earlier WE microwave relay equipment. From the looks of it, it was
>>> probably made for 'White Alice'.
>>>
>>
>> In which case it was likely used in the FPS19 radar or/and the Tropo
>> systems
>> if my memory isn't fractured. But the early Projects were begun in the
>> 50s.
>>
>> John's post reprogrammed my erroneous thought that the 1N23 is germanium.
>> It is the 1N21 that is germanium, and likely existed in the 40s.
>
>
> I googled for 1N23, some say germanium, others silicon...
Some of the "documentation" is so bad it's impossible to interpret it with
any assurance of being correct. However, I did find what I believe to be
valid data: the 1N23 is a Point Contact, Silicon device.
>
> But you are sure it IS silicon!?
Now I am.
>
> One datasheet I found was in Japanese/Chineze, and the other didn't mention
> Si/Ge at all. Max f=9,325 GHz
>
> It's hard surfing effectively with only 56 kbs at a hilltop far from the
> civilized world.
>
> At Wikipedia they said germanium:
Wiki has some Very bad information about diodes.
>
> http://en.wikipedia.org/wiki/RMA_tube_designation
>
> I am out on a job, but when I get back in Mai I can check my own sample with
> a multimeter, that will give a result.
Handle them carefully, as static discharge can destroy them easily.
>
>
> Ronald
> Norway
>
>
>
>
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Author: John LarkinDate: 22:39 13-04-08
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On Sun, 13 Apr 2008 23:23:28 +0100, "john jardine"
<john.jardine@idnet.co.uk> wrote:
>
>"Neodymium" <neo.dymium@yahoo.com> wrote in message
>news:io6dneeyupGL_5_VRVnzvQA@telenor.com...
>> > I thought at that point in time, practical diodes were all germanium
>> > point contact types, at least the ones used for RF detection. But I
>> > see from some web searching that I was wrong about that. The series
>> > of articles at this site may be interesting:
>> >
>http://www.computerhistory.org/semiconductor/timeline/1940-Discovery.html.
>> > That page mentions that the P-N junction was discovered by a
>> > researcher using purified silicon in 1940. Robert Buderi's book,
"The
>> > Invention that Changed the World: How a small group of radar pioneers
>> > won the Second World War and launched a technological revolution,"
>> > might be a good place to do some research too. I'd have a look in it
>> > to see what he says about silicon diodes, but my copy is at my office
>> > at the moment.
>>
>>
>> Thanks for this link, hadn't seen this site before! Excellent info!
>>
>>
>> > Quartz crystals for frequency control were used somewhat before that.
>> > This paper: http://www.ieee-uffc.org/fc_history/bottom.html says that
>> > a piece of quartz was used to control the frequency of an oscillator
>> > in 1919. Perhaps that is the first. I know there was a lot of
>> > interest in quartz crystals among amateur radio operators/builders in
>> > the 1930's. If you can find copies of QST or other ham magazines from
>> > that era, I'll bet you can find articles about quartz crystals.
>>
>> I knew that one. I also bought a number of old magazines on eBay with
>> atricles about piezoelectronic quartz crystals.
>>
>> WW-II info on diodes has been more difficult so far.
>>
>> Thanks!
>>
>> Ronald
>> Norway
>>
>>
>
>I've a R1359 UHF receiver. It formed part of the UK's 'Home chain' radar
>network. Tuning is via a diode stuck in the end of what looks a circular
>Lecher line.
>Diode is marked with the military designation 'CV364' and is same package as
>the IN23 series. I never found any data on this diode but for curiosity took
>it out and measured it. Germanium!.
>
But Chain Home was an HF system.
John
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Author: John FieldsDate: 10:18 14-04-08
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On Sun, 13 Apr 2008 21:41:52 +0200, "Neodymium" <neo.dymium@yahoo.com>
wrote:
>
>"Don Bowey" <dbowey@comcast.net> skrev i melding
>news:C42650B2.B518B%dbowey@comcast.net...
>> On 4/12/08 9:31 AM, in article
>> KqmdnRpvIuJgfp3VnZ2dnUVZ_hGdnZ2d@earthlink.com, "Michael A. Terrell"
>> <mike.terrell@earthlink.net> wrote:
>>
>>>
>>> John Fields wrote:
>>>>
>>>> On Sat, 12 Apr 2008 17:51:10 +0200, "ronwer"
>>>> <neo.dymium.removethisfirst@dontwantspam.yahoo.com> wrote:
>>>>
>>>>> Hi!
>>>>>
>>>>> I am doing a study into the early use of silicon diodes in radar
and
>>>>> communication equipment during the Second World War.
>>>>>
>>>>> What I would be interested in is as follows:
>>>>>
>>>>> -type numbers of the diodes
>>>>
>>>> ---
>>>> 1N23 is a good place to start.
>>>
>>>
>>> I still have one, wrapped in the lead foil that was surplused from
>>> some earlier WE microwave relay equipment. From the looks of it, it was
>>> probably made for 'White Alice'.
>>>
>>
>> In which case it was likely used in the FPS19 radar or/and the Tropo
>> systems
>> if my memory isn't fractured. But the early Projects were begun in the
>> 50s.
>>
>> John's post reprogrammed my erroneous thought that the 1N23 is germanium.
>> It is the 1N21 that is germanium, and likely existed in the 40s.
>
>
>I googled for 1N23, some say germanium, others silicon...
>
>But you are sure it IS silicon!?
---
http://www.advancedsemiconductor.com/pdf/diodes/SiliconPointContactMixer.pdf
And, here's a _good_ one:
http://www.computerhistory.org/semiconductor/timeline/1941-semiconductor.html
JF
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Author: john jardineDate: 17:00 14-04-08
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"John Larkin" <jjlarkin@highNOTlandTHIStechnologyPART.com> wrote in
message
news:hug504h8hg72aop95qvqj8jc1dkvt2vi83@4ax.com...
> On Sun, 13 Apr 2008 23:23:28 +0100, "john jardine"
> <john.jardine@idnet.co.uk> wrote:
>
[...]
> >I've a R1359 UHF receiver. It formed part of the UK's 'Home chain' radar
> >network. Tuning is via a diode stuck in the end of what looks a circular
> >Lecher line.
> >Diode is marked with the military designation 'CV364' and is same package
as
> >the IN23 series. I never found any data on this diode but for curiosity
took
> >it out and measured it. Germanium!.
> >
>
> But Chain Home was an HF system.
>
> John
>
~30MHz, Yes.
Got this particular Rx from a radio amateur who during WW11 repaired the CH
equipment. Other than him telling me it was used as a monitoring Rx
(120-520MHz) within the CH system, I've never come across any other info.
For this kind of kit though I've learned to leave the options open.
Only recently discovered an unusual SW set I have, was built specifically to
support the (pre radar) acoustic 'sound ranging' systems passively listening
across the English channel.
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Author: Tom BruhnsDate: 18:23 14-04-08
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On Apr 13, 12:41 pm, "Neodymium" <neo.dym...@yahoo.com> wrote:
> > I thought at that point in time, practical diodes were all germanium
> > point contact types, at least the ones used for RF detection. But I
> > see from some web searching that I was wrong about that. The series
> > of articles at this site may be interesting:
> >http://www.computerhistory.org/semiconductor/timeline/1940-Discovery.....
> > That page mentions that the P-N junction was discovered by a
> > researcher using purified silicon in 1940. Robert Buderi's book, "The
> > Invention that Changed the World: How a small group of radar pioneers
> > won the Second World War and launched a technological revolution,"
> > might be a good place to do some research too. I'd have a look in it
> > to see what he says about silicon diodes, but my copy is at my office
> > at the moment.
>
> Thanks for this link, hadn't seen this site before! Excellent info!
>
> > Quartz crystals for frequency control were used somewhat before that.
> > This paper: http://www.ieee-uffc.org/fc_history/bottom.htmlsays that
> > a piece of quartz was used to control the frequency of an oscillator
> > in 1919. Perhaps that is the first. I know there was a lot of
> > interest in quartz crystals among amateur radio operators/builders in
> > the 1930's. If you can find copies of QST or other ham magazines from
> > that era, I'll bet you can find articles about quartz crystals.
>
> I knew that one. I also bought a number of old magazines on eBay with
> atricles about piezoelectronic quartz crystals.
>
> WW-II info on diodes has been more difficult so far.
>
> Thanks!
>
> Ronald
> Norway
Now that I'm in my office, I can look at the Buderi book. Indeed it
has some interesting stuff: from page 117 (near the bottom),
"From that point, it did not take long to identify the Brisith
receiver's silicon crystal detectors as the main factor behind its
superior showing. The Radlab radar employed a grounded grid triode.
The finding stunned the Americans, since they ahd started with
crystals but abandoned them earlier in the year after tests showed
vacuum tubes to be superior. Only later, Ramsey related, did it
become apparent that the crystal used for the American tests had
partially burned out. The British, by contrast, had gone with
crystals from the start. By spring 1941, Oliphant's lab had designed
a better capsule that lessened susceptibility to shock and vibration,
and rendered crystals superior to anything in the United States; these
had gone into mass production at British Thomson-Houston. Around the
same time the duplexing, or TR, problem was solved by the ingenious
application of a reflex klystron, itself an adaptation of the Varian
brothers' original creation. The so-called soft Sutton tube was
filled with a low-pressure gas that was rapidly ionized by the
transmitter pulse, providing a short circuit that protected the
crystal from burnout. Once the pulse ended, the gas recovered,
allowing received signals passage to the detector."
There's a nice section at pages 314-320 covering the discovery of the
silicon P-N junction.
Cheers,
Tom
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Author: whit3rdDate: 20:45 14-04-08
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On Apr 12, 9:24=A0am, John Fields <jfie...@austininstruments.com> wrote:
> On Sat, 12 Apr 2008 17:51:10 +0200, "ronwer"
>
> <neo.dymium.removethisfi...@dontwantspam.yahoo.com> wrote:
> >Hi!
>
> >I am doing a study into the early use of silicon diodes in radar and
> >communication equipment during the Second World War.
> 1N23 is a good place to start.
My (early seventies) reference says 1N23 was Ge(germanium),
and the lowest-listed Si diode is 1N53. In any case, germanium
or silicon diodes were fragile point-contact things, and wouldn't
have been rugged enough for portable or aircraft use.
I think the development of pellet diodes happened AFTER WW II.
Quartz stabilization of radios was a major improvement,
and aircraft radios benefited greatly. German fighter aircraft
directed by ground-radar operators were the most effective
defense against British strategic bombing...
The "1N" designation for semiconductor diodes comes from JEDEC
which was only created in 1958, a decade after WW II.
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Author: JosephKKDate: 14:26 20-04-08
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On Sat, 12 Apr 2008 11:29:18 -0500, John Fields
<jfields@austininstruments.com> wrote:
>On Sat, 12 Apr 2008 11:24:19 -0500, John Fields
><jfields@austininstruments.com> wrote:
>
>>On Sat, 12 Apr 2008 17:51:10 +0200, "ronwer"
>><neo.dymium.removethisfirst@dontwantspam.yahoo.com> wrote:
>>
>>>Hi!
>>>
>>>I am doing a study into the early use of silicon diodes in radar and
>>>communication equipment during the Second World War.
>>>
>>>What I would be interested in is as follows:
>>>
>>>-type numbers of the diodes
>>
>>---
>>1N23 is a good place to start.
>
>---
>Oops... brain fart.
>
>The 1N23 didn't appear until the '50's, I believe.
>
>JF
Not only that it was germanium not silicon.
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Author: Don BoweyDate: 16:59 20-04-08
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On 4/20/08 11:26 AM, in article am2n04hciv1c0trs9vmfala4pf78ic80nb@4ax.com,
"JosephKK" <quiettechblue@yahoo.com> wrote:
> On Sat, 12 Apr 2008 11:29:18 -0500, John Fields
> <jfields@austininstruments.com> wrote:
>
>> On Sat, 12 Apr 2008 11:24:19 -0500, John Fields
>> <jfields@austininstruments.com> wrote:
>>
>>> On Sat, 12 Apr 2008 17:51:10 +0200, "ronwer"
>>> <neo.dymium.removethisfirst@dontwantspam.yahoo.com> wrote:
>>>
>>>> Hi!
>>>>
>>>> I am doing a study into the early use of silicon diodes in radar and
>>>> communication equipment during the Second World War.
>>>>
>>>> What I would be interested in is as follows:
>>>>
>>>> -type numbers of the diodes
>>>
>>> ---
>>> 1N23 is a good place to start.
>>
>> ---
>> Oops... brain fart.
>>
>> The 1N23 didn't appear until the '50's, I believe.
>>
>> JF
>
> Not only that it was germanium not silicon.
Do you have a solid reference for that? "Credible" references I found said
they were silicon.
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Author: John LarkinDate: 17:39 20-04-08
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On Sun, 20 Apr 2008 13:59:36 -0700, Don Bowey <dbowey@comcast.net>
wrote:
>On 4/20/08 11:26 AM, in article am2n04hciv1c0trs9vmfala4pf78ic80nb@4ax.com,
>"JosephKK" <quiettechblue@yahoo.com> wrote:
>
>> On Sat, 12 Apr 2008 11:29:18 -0500, John Fields
>> <jfields@austininstruments.com> wrote:
>>
>>> On Sat, 12 Apr 2008 11:24:19 -0500, John Fields
>>> <jfields@austininstruments.com> wrote:
>>>
>>>> On Sat, 12 Apr 2008 17:51:10 +0200, "ronwer"
>>>> <neo.dymium.removethisfirst@dontwantspam.yahoo.com> wrote:
>>>>
>>>>> Hi!
>>>>>
>>>>> I am doing a study into the early use of silicon diodes in radar
and
>>>>> communication equipment during the Second World War.
>>>>>
>>>>> What I would be interested in is as follows:
>>>>>
>>>>> -type numbers of the diodes
>>>>
>>>> ---
>>>> 1N23 is a good place to start.
>>>
>>> ---
>>> Oops... brain fart.
>>>
>>> The 1N23 didn't appear until the '50's, I believe.
>>>
>>> JF
>>
>> Not only that it was germanium not silicon.
>
>Do you have a solid reference for that? "Credible" references I found
said
>they were silicon.
>
All my references say that the 1N23 is a silicon point-contact
(Schottky) diode. MicroMetrics still makes them - at insane prices -
and theirs are definitely silicon.
http://www.micrometrics.com/pdfs/PC_SXBandMixer.pdf
Some of the WWII vintage mixer diodes are impressive. Vf was typically
about 250 mV at 1 mA, and junction capacitances were a couple of
tenths of a pF, about as good as any packaged diode you can buy today.
John
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Author: John LarkinDate: 17:51 20-04-08
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On Sat, 12 Apr 2008 11:29:18 -0500, John Fields
<jfields@austininstruments.com> wrote:
>On Sat, 12 Apr 2008 11:24:19 -0500, John Fields
><jfields@austininstruments.com> wrote:
>
>>On Sat, 12 Apr 2008 17:51:10 +0200, "ronwer"
>><neo.dymium.removethisfirst@dontwantspam.yahoo.com> wrote:
>>
>>>Hi!
>>>
>>>I am doing a study into the early use of silicon diodes in radar and
>>>communication equipment during the Second World War.
>>>
>>>What I would be interested in is as follows:
>>>
>>>-type numbers of the diodes
>>
>>---
>>1N23 is a good place to start.
>
>---
>Oops... brain fart.
>
>The 1N23 didn't appear until the '50's, I believe.
>
>JF
Early 40's, actually. It was widely used as a radar mixer in WWII.
John
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Author: Michael A. TerrellDate: 18:06 20-04-08
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John Larkin wrote:
>
> On Sat, 12 Apr 2008 11:29:18 -0500, John Fields
> <jfields@austininstruments.com> wrote:
> >
> >Oops... brain fart.
> >
> >The 1N23 didn't appear until the '50's, I believe.
> >
> >JF
>
> Early 40's, actually. It was widely used as a radar mixer in WWII.
A lot of existing devices were given JEDEC numbers after the system
was created. Different manufacturers made similar parts, with different
numbering. That was why the standard was created.
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Author: Michael A. TerrellDate: 18:08 20-04-08
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John Larkin wrote:
>
> All my references say that the 1N23 is a silicon point-contact
> (Schottky) diode. MicroMetrics still makes them - at insane prices -
> and theirs are definitely silicon.
>
> http://www.micrometrics.com/pdfs/PC_SXBandMixer.pdf
Some originals are still avilible as NOS surplus, if you know where
to look. :)
> Some of the WWII vintage mixer diodes are impressive. Vf was typically
> about 250 mV at 1 mA, and junction capacitances were a couple of
> tenths of a pF, about as good as any packaged diode you can buy today.
>
> John
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Use any search engine other than Google till they stop polluting USENET
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