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

[Ray Fantini]

Almost all the older series Harris FM broadcast transmitters used that style diode in the reflectometer for sensing forward and reflected power. I have two FM-10 K series 10kW transmitters and one RCA 3 kW transmitters as standby transmitters that still use them, think the HT-20 20 kW also uses them too. The design allows them to easily be changed in the event of damage although I have never had one fail, don't know if it's the same number but definitely the same design, If you loosen the set screw on one end they just become a pin on Bothe sides don't they?
Ray Fantini KA3EKH 

-----Original Message-----
From: milsurplus-bounces at mailman.qth.net [mailto:milsurplus-bounces at mailman.qth.net] On Behalf Of J. Forster
Sent: Tuesday, December 15, 2009 1:23 PM
To: Ray Fantini; Dennis Monticelli
Cc: milsurplus at mailman.qth.net
Subject: Re: [Milsurplus] 1N21's and 1N23's

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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