[ARC5] Distribution of ARC-5 Audio

Sun Apr 24 10:01:50 EDT 2016

Unorganized material? What's that?? In the process right now of re-packing
my equipment for a move to temp storage. It's at least been lined up on
shelving the last few years - the most organized it's ever been, and I
still can't find anything.

The control box is a mystery to me as each control section has an output
pot and 8 pin input jack, as well as the necessary switches, but the center
control has no jacks on bottom. Maybe the audio switching is handled inside
somehow? Or was the center receiver generally reserved for a beacon set or
some other local use?

Have still yet to power up any of my receivers beyond the one I chopped up
in school for AC use. Will be interested in hearing how you make out,
Cliff.

Still sifting through the interphone systems on Mike's website. The Navy
truly wins the prize for wow factor. Nice looking stuff, but finding
connectors must be fun!

~ Todd/KAQ

On Sun, Apr 24, 2016 at 9:48 AM, Cliff Miller <cliff52 at gmail.com> wrote:

> My take on the BC-450 3-receiver control box is that it is cabled to each
> of three receivers, basically extending the local jacks to the operator's
> side.  Tuning is mechanically coupled, so you may tune any of the receivers
> at any time.  There's an individual Sensitivity control for each receiver.
> The CW-OFF-MCW switches the 28V power off (filaments cool, dynamotor spins
> down) so only one receiver is in your ear at a time.  (I wonder if there's
> a caution to only have one switch on at a time or if that's not possible?)
>
> The A and B jacks I bet are outputs to plug in two headsets.  Looking for
> a schematic - have too much unorganized material.
>
> One of these would do what I'm attempting though I'd have to make up my
> own cables.
>
> On Sun, Apr 24, 2016 at 9:28 AM, Todd, KA1KAQ <ka1kaq at gmail.com> wrote:
>
>> 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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>>
>>
>
>
> --
> Cliff Miller
> 946 Deercrest Circle
> Evans, GA 30809 USA
> 706-726-2652 mobile
> cliff52 at gmail.com
>
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