[ARC5] Keying Approach

[Robert Eleazer]

Yes, that's reasonable, although in a light aircraft intercom, if one person 
hits the PTT switch I think everything that is being said over the intercom 
at that point will go out over the radio anyway.  The PTT switch generally 
is between the intercom and the radio rather than between one mike and the 
intercom.

But that may not be always the way it is.  A friend of mine who was a radio 
operator in PB4Y-2 aircraft in WWII said that when they had multiple 
aircraft in a formation that came under fighter attack, he would switch the 
intercom into the radio so that everyone could hear not only their own crew 
but the other aircraft calling out fighter attacks as well.  In that case 
you would not want hot mikes all the way around.

His and another PB4Y-2 got jumped by 10 Shinden "George" fighters and they 
had quite a running battle in which they claimed two of the fighters.  I 
wrote about that in an article in Aviation History.

Wayne

----- Original Message ----- 
From: "Jim Haynes" <jhhaynes at earthlink.net>
To: "Robert Eleazer" <releazer at earthlink.net>
Cc: <arc5 at mailman.qth.net>
Sent: Wednesday, January 14, 2015 4:18 PM
Subject: Re: [ARC5] Keying Approach


>A more plausible reason, to me, is that you might have more than one mike
> plugged into the same radio.  So you want only the one that is intended
> to key the transmitter to be connected to it.  Any others would just
> increase the noise and reduce the signal from the intended mic.
>
> Consider for example the BC-366 jack box. 
> (COMP-LIAISON-COMMAND-INTER-CALL)  Several crew members might have the
> rotary switchs set to the same position, but you only want one mike at
> a time connected to the radio.
>
> jhhaynes at earthlink dot net
>
>
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