On 4/13/08 12:41 PM, in article ,
"Neodymium" wrote:


"Don Bowey" skrev i melding
...
On 4/12/08 9:31 AM, in article
, "Michael A. Terrell"
wrote:


John Fields wrote:

On Sat, 12 Apr 2008 17:51:10 +0200, "ronwer"
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