[ARC5] The U.K. Aircraft Dynamic Mics (was "T-1154...)

[Mike Hanz]

On 6/26/2012 4:07 AM, BenG4BXD wrote:
> There was the A1134 British intercom amp,
> http://home.versatel.nl/gmwzijlstra-prummel/mockup%20a%20005.jpg

Thanks for that - I always wondered what the UK aircraft used in WWII.


> also the US BC-347  http://aafradio.org/flightdeck/BC-347.jpg

Alas, the BC-347 is a high level amp for the entire aircraft, not for 
dynamic mics.  The only two U.S. aircraft interphone amplifiers I know 
of that were dedicated to dynamic mics are the BC-216 that I referred to 
in my last - used in the 1930s (at the bottom of the page at 
http://aafradio.org/flightdeck/1935/SCR-AE-183.html ) but requiring a 
dynamotor, and the Model K that Ben mentioned below - introduced so that 
U.S. aircraft could use British mics in WWII.  It only required 28 vdc 
on the plates. There was also an analogous attenuator for U.S. carbon 
mics for use in British aircraft, primarily for the SCR-522.

> or the Packard Bell model K
> http://www.vintage-radio.net/forum/attachment.php?attachmentid=50819&d=1304980188
>
>> Speaking of mics in U.K. sets:> I've found no detailed documentation
> on the microphones> used in U.K. aircraft.> Can someone enlighten me
> about the types and specifications> of dynamic mics used in WWII U.K.
> aircraft?> Are they voltage- or current-driven designs?> They must have
> had a high output level, given what> it takes to use the "Dynamic"
> setting on an ART-13.> And also, the specs on the carbon mics used?Hi
> Dave,I am no expert but I believe the larger aircraft sets used the
> intercomamp as a mike amp. I vaguely remember seeing a dry battery
> powered ampused in some diagrams.The VMARS Manuals web site may have a
> lot of information of use with theBritish sets.Also, if you like, I can
> pose your question to the VMARS Yahoo Group.Best.-John
> ______________________________________________________________
>