[ARC5] Distribution of ARC-5 Audio

[Michael Hanz]

I forgot to mention that if you were interested in _only_ the ARC-5 
receivers, see the AN/AIC-4 interphone system diagrams at 
http://aafradio.org/docs/AIC-4.html - things were a lot simpler then.

On 4/24/2016 8:13 AM, Michael Hanz wrote:
> On 4/23/2016 7:33 PM, Cliff Miller wrote:
>> In an aircraft with multiple receivers, how was the audio output 
>> controlled and distributed?  Were the audio outputs bussed together 
>> or switched somehow so an individual user would only hear one receiver?
>
> There is a very large number of answers to your question - as posed.  
> First you have to define what you mean by "aircraft" - size, number of 
> crewmen, primary mission, etc.  Then you have to define "individual 
> user" in terms of their role in the aircraft. The audio distribution 
> in a military aircraft (normally called the interphone system) 
> followed various paths over the years, growing exponentially more 
> complex by the end of WWII because of the specialization of aircraft 
> missions into less well known groups like countermeasures and signals 
> intelligence.  One place to start is at 
> http://aafradio.org/flightdeck/Interphone_systems.html where you can 
> see the trends from the earliest RL-** Navy and USAAC RC-** 
> interphones to where it all was going by the last system on the page 
> (the AN/AIC-5).  You'll see two different control boxes associated 
> with that set, with different degrees of receiver selection.
>
> The AN/AIC-5 gradually evolved through the 1950s - for example, the 
> AN/AIC-7 was essentially an AIC-5 with high intensity loudspeakers 
> added for internal and external use.  Its manual states, "The pilot, 
> copilot, radio operator, and navigator are each provided with a master 
> control unit that permits selecting any one or combination of eight 
> radio receiver outputs as desired."  The next generation appeared in 
> the AN/AIC-10, which became perhaps one of the most prolific systems 
> in the inventory. It bridged the gap between tubes and transistors - I 
> have one each of a couple of LS-184/AIC-10 loudspeakers with internal 
> amplifiers that represent that shift from tubes to solid state.
>
> 73,
> Mike  KC4TOS

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