The standard AC mains power in the US is 120 VAC and 240 VAC, except for
industrial areas with three-phase power in which case the standard is 120
VAC and 208 VAC. These are all RMS values and 60 Hz of course. I'm sure
that some people will disagree with these voltages but my local electric
power utility here in Virginia says that these are their targets: They may
vary a few percent higher or lower.
Most power transformers don't care whether you operate them on 50 or 60 Hz,
and you can always get away with operating a 50 Hz transformer on 60 Hz.
But there is a small chance that a 60 Hz transformer could possibly overheat
when operated on 50 Hz.
73, Steven - N5SK
-----Original Message-----
From: John Nelson [mailto:john@steampower.demon.co.uk]
Sent: Monday, January 19, 2004 2:34 PM
To: yaesu@contesting.com
Subject: [Yaesu] FT-1000D mains transformer
For the sake of the archives, here's a corollary to the earlier replies.
Having now had a chance to look at a 1990-vintage manual for the FT-1000,
there's a section entitled 'Changing the mains transformer primary winding
for different AC voltages' on page 5. Above it is a section on power
connection, which amongst other things gives the mains fuse capacities for
100-117V (15A) and 200-234V (8A). Curiously, there isn't a specification as
such with this manual but I don't know anywhere in the world that uses
200-234V supplies with a 60Hz supply frequency, so it seems reasonable to
assume that the transformer is specified with both 50 and 60Hz operation in
mind.
So unless the later models are substantially different, it would seem that
we can put this one to bed.
73 John
GW4FRX
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