[Milsurplus] 1N21's and 1N23's

[Dennis Monticelli]

I happen to have a Sierra power meter (military) that looks just like the
Philco version and it uses this type of diode because it works through UHF.
I'm aware of the HP uses you listed.

BTW, if you haven't tried one in a crystal radio you may be pleasantly
surprised.  Being a point contact metal-to-semiconductor junction, the low
threshold of the 1N21 makes for an excellent AM detector for the BCB.

Dennis AE6C

On Tue, Dec 15, 2009 at 10:22 AM, J. Forster <jfor at quik.com> wrote:

> Very few power meters use these diodes. They are for mixers. Almost ANY
> older WG mixer will use one or two...  sometimnes 4. They are also used in
> HP WG detectors and some coaxial detectors. (HP 423A).
>
> Frankly, I'd NOT tamper with the "adjusment" screw except on a KNOWN bad
> one.
>
> -John
>
> ==========
>
>
> > That's a good point about the mechanical fit problem.  Some of those
> > bullet
> > packages featured a screw in the bottom to set the tension of the point
> > contact hair spring.  Since an HP Shottkey glass diode is approximately
> > the
> > size of an 1/8 watt resistor (i.e. very small), I wonder if it could be
> > stuffed into the original case?  But as long as these NOS surplus diodes
> > are
> > still kicking around and provided their point contacts haven't been
> > compromised, it seems that rarely would someone have to do a retrofit.  I
> > imagine that most of the current uses for these diodes would be as
> > detectors
> > in old power meters.
> >
> > Dennis AE6C
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