[Milsurplus] 115 VAC 400 hz power

[Boeing377]

From: "Taigh Ramey" <taigh at twinbeech.com>
Subject: Re: [Milsurplus] 400 cycle 3 phase and WW2
To: <milsurplus at mailman.qth.net>
Message-ID: <00a201cbb347$4bfea2a0$e3fbe7e0$@com>
Content-Type: text/plain;   charset="US-ASCII"

My impression of the early use of 115v 400cy (pre war/early war) was for
selsyn transmitters used for instrumentation. Instead of direct reading
instrumentation where you would have to run tubing from the engines to the
cockpit they elected to use selsyn transmitters and instruments. 

*************************************************************************************

115 VAC at 400 hz was also used as input for the power transformers in some WW2 aircraft nav gear such as SCR 269, ARN 7, APN 4, APN 9 etc.

Taigh knows this of course as he had a working ARN 7 ADF in his last C 45 (actually a Navy SNB-2C) aircraft.

Tell us about your latest plane (Lockheed PV-2?) Taigh. Are you going to outfit it with authentic WW 2 radio gear?  Cant wait to see it. 

In the unlikely event that anyone wants to test a LORAN A set, I have a LORAN A signal simulator buried somewhere amidst my boatanchors.
I've been tempted to amplify the output and fire it up on the 160M band to give the old timers a jolt, but sanity prevailed. The sound of LORAN A signals is something the old timers on Top Band will never forget. 

73
Mark