[ARC5] "Retaining" plugs

[J. Forster]

Yes, quite.

The Brits had a special plug-jack arrangement that one occasionally sees
w/ R.1155-T.1154 setups. They have virtually no detentr.

-John

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


> That's the reason for the "short" 1/4 inch plug on headsets, and the
> CD-307 headset extension cord with a jack on the end to accept the short
> plug.
>
> This was known as a "Bail-Out Plug."  The plug and jack would separate in
> the event of a need to bail out.  This was especially easy to disconnect
> in a fighter, if the pilot had only to roll the a/c inverted, unfasten the
> seat belt and fall out.
>
> Remember, many headsets -- probably most -- were actually part of the
> leather flight helmet, and therefore couldn't be just taken off and left
> in the a/c.
>
> 73
>
> Mike
> W4DSE
>
> --- On Thu, 7/4/13, J. Forster <jfor at quikus.com> wrote:
>
>> From: J. Forster <jfor at quikus.com>
>> Subject: Re: [ARC5] "Retaining" plugs
>> To: "Mike Everette" <radiocompass at yahoo.com>
>> Cc: arc5 at mailman.qth.net
>> Date: Thursday, July 4, 2013, 9:34 AM
>> 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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>
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