[ARC5] NDRC & Aircraft Audio above 20,000 Ft
Jim Falls
radio-tuber at att.net
Fri Sep 22 17:58:12 EDT 2017
Anyone know where I can get a replacement set of rubber earpieces for my HS-30? Can the material be rejuvenated?
Cheers!
Jim K6FWT
> On Sep 22, 2017, at 10:20, Brooke Clarke <brooke at pacific.net> wrote:
>
> Hi:
>
> I've been studying the various projects by the National Defense Research Committee and came across a discussion of aircraft audio.
> https://en.wikipedia.org/wiki/National_Defense_Research_Committee
>
> In the book: Scientists Against Time, 1952, James Phinney, 3rd ed (Wiki) they mention the problems with the microphones and earphones at high altitude and that throat mikes were poor above 20,000 feet.
> Also speakers and common headsets did not work well and were replaced by units that fit into the ear, maybe the HS-30.
> http://prc68.com/I/HS30A.shtml
>
> Is there information on what audio headsets and microphones were used at the start of W.W.II vs. what was being used at the end of the war in high altitude bombers?
>
> PS Other web pages I'm working on related to NDRC programs:
> China Lake patents (VT Fuzes and Sidwinder missile) in process
> http://www.prc68.com/I/Submarines.html
> http://www.prc68.com/I/Torpedoes.html (and naval mines, depth charges, hedge hog)
> http://www.prc68.com/I/Sonobuoy.shtml (need to add MAD: Magnetic Airborne Detector (as it was called in 1946).
> --
> Have Fun,
>
> Brooke Clarke
> http://www.PRC68.com
> http://www.end2partygovernment.com/2012Issues.html
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