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Old November 17th 03, 08:14 PM
M. J. Powell
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In message , Peter Stickney
writes

snip

As to the comment from another post in this thread, yes, lip mikes
existed, but that theory falls down on two points. If I'm remembering
things correctly, you can't just plug one into a system intended for
Carbon mikes - As I Seem To Recall, there are impedance matching
issues that require some manner of additional circuitry. It wouldn't
have been impossible, but I can't imagine the RAF restringing the
interphone system on a single Lancaster just to accomodate the
Propaganda Campaign.


The lip mic would have fed the small mixer unit at the recorder. The a/c
intercom would be another input, suitably padded down.

The other factor is that lip mikes and Oxygen
Masks don't mix.


Yes, I imagined WVT using an oxygen mask until he wanted to speak then
unclipping, saying his stuff, then clipping back up.
d
Bomber Command Lancs spent their missions at night
up past 18,000', and supplemental Oxygen is necessary t those heights,
and very useful at much lower altitudes. (The extra O2 increases night
vision). There should be 8 or 9 guys on that airplane, all waring
Oxygen masks, and all, at som epoint, talking on the intercom, with
the mask microphones. We ought to hear _somebody_ breathing,
dagnabbit!


Was it common practice to stay switched off until you wanted to say
something?

In my recording, there is no breathing audible. Everyone was 'off' until
speaking.

Mike
--
M.J.Powell
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