[ARC5] Shunt vs. Parallel

[Kenneth G. Gordon]

On 16 Jul 2017 at 0:33, WA5CAB--- via ARC5 wrote:

> However, the primary reason for the change may have been that aircraft service ceilings went up 
> significantly during the War.  The ATC and AN/ART-12, which already had shunt feed, switches to 
> low power at around 21,000 feet MSL by dropping the high DC plate supply voltage from around 
> 1200 to around 750 VDC.
> 
> But this is all just guessing.  I went through the manuals again and there are no hints.

Well, after thinking a bit more about it, I am sure you are correct. As someone else here 
mentioned, the P-38 could fly at 40K feet, and I am sure there were others.

I know that the early F6F had significant problems with the ignition shorting out and the 
engine completely and suddenly stopping above a certain altitude until the engineers carefuly 
reworked the ignition system to prevent it at "high" altitudes.

I am sure the radios had the same issues to contend with. Why wouldn't they?

Good thinking, Robert. It had never occurred to me either.

Ken W7EKB

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