[ARC5] Command Set Antenna Relay Series Capacitor Use

[Brian Clarke]

Thank you, Mike, for that clarification.
73 de Brian, VK2GCE.

----- Original Message ----- 
From: "Mike Morrow" <kk5f at earthlink.net>
To: "ARC-5" <arc5 at mailman.qth.net>
Sent: Saturday, June 18, 2011 9:34 PM
Subject: [ARC5] Command Set Antenna Relay Series Capacitor Use


>> Further, the original designers supplied a vacuum capacitor with the
>> antenna changeover relay (BC-442, RE-2 / ARC-5) with instructions in
>> the operating manual for connecting it in series or parallel with the
>> antenna feed to match other impedances than that presented by a short
>> airplane antenna.
>
> That capacitor is intended for ONLY ONE situation:  Use of the 7 to 9.1 
> MHz
> transmitter in installations where the command antenna is too LONG for 
> that
> frequency range.  In that instance, the antenna connection would be routed
> to one end of the capacitor instead of to the TR (transmitter) terminal on
> the antenna relay.  The other end of the capacitor would be connected to 
> that
> TR terminal, where the other transmitter(s) in the command set are also
> connected.  Thus, for that transmitter ONLY, the capacitor would be in 
> series
> with its output.
>
> The BC-442-AM model of antenna relay was manufactured without this 
> capacitor
> for those installations that did not use the BC-459-A transmitter, or for
> installations such as fighter aircraft where the antenna was never going 
> to
> be too long electrically, even at 9 MHz.
>
> Thus, this capacitor was never used for antennas that were too short. 
> Also,
> use of this capacitor for multiple transmitters, or in a parallel 
> arrangement,
> was not part of the command set design.
>
> Mike / KK5F
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