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

[Dennis Monticelli]

I have never touched the setscrew on one of these and just assumed it was
whisker tension adjustment.  Although the body of the double-ended pin style
diode housing is indeed the same size as the body of the set screw type, I
don't see how the end screw could clamp on a buried pin.  Besides the
set-screw style diodes I have all used glyptol to lock the screw in place.
That tells me that the depth setting was critical which in turn implies
whisker tension.  Maybe someone out there has a bad set screw diode and
could answer this question once and for all.


Dennis AE6C

On Tue, Dec 15, 2009 at 12:10 PM, J. Forster <jfor at quik.com> wrote:

> Hi Ray,
>
> I don't understand this:
>
> "If you loosen the set screw on one
> > end they just become a pin on Bothe sides don't they?"
>
> I think the "whisker" is attached to the screw. If you loosen it, you get
> an open circuit. If you screw it down too far, a short.
>
> -John
>
> ===============
>
>
>
>
> > 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
>
>
>