[ARC5] "Retaining" plugs

[Mike Everette]

I think I remember reading someplace that the "knurled ring" on the BC-451 control box is not a retainer, but actually some kind of switch that works in conjunction with a PTT switch on the stick grip of the aircraft, when a throat microphone is used.  Maybe it opens the "tip" connection (key) on the control box mic plug and connects the lead to the aircraft wiring?  I'll try to run down the reference; it may be in my SCR-274N manual which hasn't been looked at in a very long time.  Please correct me if I'm mistaken....

73

Mike
W4DSE

--- On Thu, 7/4/13, Jay Coward <jcoward5452 at aol.com> wrote:

From: Jay Coward <jcoward5452 at aol.com>
Subject: Re: [ARC5] "Retaining" plugs
To: jfor at quikus.com, radiocompass at yahoo.com
Cc: arc5 at mailman.qth.net
Date: Thursday, July 4, 2013, 1:53 PM


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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