Jim, you could subtract your meter lead resistance from each winding
measurement, its even better. Also, notice that the value of R slowly
dropped. This is because the secondary is resisting the step change flow
of current, just like a capacitor resists a change in voltage. Be
careful about having hand on each probe as there might be kick, the EMF
from disconnecting that continuous current. It used to be much worse
when using a Simpson 260 VOM. Don't ask me how I would know that.
That is an awfully heavy iron part to place on a sheet metal chassis
bottom. It might help to add some flat stock across from end to end,
like 2 inch wide aluminum bars. This spreads the load and prevents
dimpling of the sheet metal. In commercial transmitters with even
smaller transformers, we used 3/8 steel plate for the bottom and drilled
holes, welded nuts on the bottom for bolting the iron in. This also had
some I beams welded to it, so that a pallet jack or fork lift could move
it. That would be overkill for yours.
73
John
K5PRO
Message: 1
Date: Tue, 21 Feb 2023 12:53:20 -0800
From: "jim.thom jim.thom@telus.net" <jim.thom@telus.net>
To: amps@contesting.com
Subject: [Amps] 10 KW CCS ON 6M...USING THE 3CX-6000A7... PART 16
Here, finally the 17.6 kva CCS / 280 lb custom Heyboer plate xfmr is
unpacked.
B+ supply is being built this week. I specd' the pri + sec taps, temp rise
over ambient, max secondary DC resistance etc, for Scott. Scott just moved
into a bigger home...on 2 acres, on Feb 10th, so he was tied up with the
huge moving endeavor, removing old tower, and packing hundreds of lbs of
radio gear to the new workshop. .
https://www.youtube.com/watch?v=og9hwdIaIXk
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