[ARC5] Distribution of ARC-5 Audio

[K5MYJ]

Try flying in the waist compartment of a B-25!

Bob Macklin
K5MYJ
Seattle, Wa.
"Real Radios Glow In The Dark"
  ----- Original Message ----- 
  From: Todd, KA1KAQ 
  To: Michael Hanz 
  Cc: ARC-5 Mail List 
  Sent: Sunday, April 24, 2016 6:28 AM
  Subject: Re: [ARC5] Distribution of ARC-5 Audio


  And at a more basic level, receiver choice can be controlled by where you plug in your headphones on either the receiver rack or control box, though the 3 receiver control box only appears to have outputs for two of the receivers. 


  Having been fortunate enough to have flown in a B-17, I still chuckle at the thought of external speakers. (o: 


  ~ Todd,  KA1KAQ/4



  On Sun, Apr 24, 2016 at 8:26 AM, Michael Hanz <aaf-radio-1 at aafradio.org> wrote:

    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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