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Went to England to see a friend, and got involved with a 1942 Avro Lancaster.

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Warpspeed:
400Hz is still fairly common in marine equipment as well.  Similar hardware such as radars and weaponry can be mounted in all kinds of different platforms such as ships, aircraft, vehicles, and ground installations.
Its pretty much the military/aerospace standard for most things, and still is.

Mary B:

--- Quote from: DamonHD on March 17, 2022, 04:29:30 PM ---Isn't (or wasn't) 400Hz simply a common miltary standard, allowing lighter/smaller transformers than 60Hz?

Rgds

Damon

--- End quote ---

Light? The AM6154 was 75 pounds LOL they were a beast to move! The high voltage power supply was 60hz and the bulk of the weight, the only part that was 400 hz was a converter power supply for the blower motor... made ZERO sense! And all the weight was to the rear making it a real pain to put in a 19" rack cabinet! 2 person job! NOISY blower, I had one and it drove me nuts with the racket it made, other stations could hear it run when I keyed the mic.

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