[ARC5] "Retaining" plugs

[Jay Coward]

These plugs were not used on headsets. If you look closely at the headset jacks on ARC-5 gear there is no threads extending out for a retaining ring. Look at the Key jack on the BC-451 Transmitter control box and you will see what I am referring to. The Mic jacks also have this feature. Also look at the throttle switch jack on the ATC and ART-13 transmitters. They can accept this special plug so that they can not be unplugged by accident.

I'd like to get a bunch of these if someone finds the warehouse where they are hidden,


Jay KE6PPF


-----Original Message-----
From: J. Forster <jfor at quikus.com>
To: Mike Everette <radiocompass at yahoo.com>
Cc: arc5 <arc5 at mailman.qth.net>
Sent: Thu, Jul 4, 2013 10:16 am
Subject: Re: [ARC5] "Retaining" plugs


Somehow, if I were in a plane along with a lot of avgas, ammo, and bombs,
being shot at, I'd really not want screw fastenings on my headset cord
that needed to be unscrewed in order to make a fast exit.

YMMV,

-John

==================




> I've seen a number of the PL-68/PJ-068 connectors with threads protruding
> beyond the plastic shell, on a couple of different types of microphones.
> Off the top of my head I don't remember any PL-55/PJ-055 crossing my path
> that have the threads exposed but there may well have been.  At a hamfest
> a couple of years ago I bought a bunch of "new" headset extension cords
> like the CD-307, I'll look them over more closely.
>
> Truth be told, I never thought of the exposed threads being for a
> retaining device; I just thought that for some reason the shells didn't
> screw all the way on (duuuuh).  I've either repaired or installed numerous
> of these plugs in ham apps and gen-av avionics, so yes, I've seen a few.
>
> As an aside, Motorola uses a similar idea with their "audio adapter"
> devices employed with current hand held radios, when headsets or earpieces
> are in use.  The plugs are 1/8 inch instead of 1/4; but they do have some
> exposed threads to lock the cord into the adapter, which is attached to
> the side of the radio (that's what the exposed flush gold plated terminals
> on the side are for, in addition to programming-cable connection).
>
> Back to the matter of WW2 gear, I would think that oxidation or corrosion
> of the brass PL-55/68 etc especially in humid climates would have been a
> far more serious problem than plugs popping out, though.  I've cleaned
> quite a few myself when audio, either receive or transmit, got scratchy or
> intermittent.
>
> 73
>
> Mike
> W4DSE
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