[AMPS] Re: 8k ultra/ "tuned input"
Thu, 18 Oct 2001 14:06:14 -0700
> Well, here are the specs directly from the manual, Section 1.
> Henry 3K and 8K Ultra Specification:
> "Output Power: 3K - 1500 watts PEP or DC nominal.
> 8K - 5000 watts PEP or 2500 watts DC nominal
[Steve Katz] Holy cow! 1500W DC? 2500W DC? Is that, like, 2500V
at 1Adc? Or 25,000V at 100 mA? Wonder how they measure it??
> Drive Power: 3K - 100 watts, 8K - up to 200 watts nominal.
> Duty Cycle: Continuous duty at rated output."
> Data supplied with my 8K, taken by Paul Johnson at Henry
> shows at a drive power of 200 to as high as 275 watts on
> both 160 and 15 meter bands, over 5000 watts of output
> power was measured into the big Henry dummy load. Un-
> loaded plate voltage was read to be 5800 at that time.
> Too 200 watts drive on 20 and 80 to reach such ouput
> power, and 230 watts drive on 40, and 250 on 10 to
> reach similar output powers. I have never attempted this, hi!!
> Don't have a dummy load to take it, and am afraid for my
> antenna system components!
> Jim T. and Rich M. both point out the need to keep the
> filament voltage under control: 7.5 or a bit lower, best.
> My mains run closer to 240 out here than 230; thus
> my filament voltage, as read on the Controller Unit
> meter is more often around 7.6. Guess I better get in there
> and move the transformer taps up to the 240 setting from
> 230, as placed by the factory, per the manual.
> Phil also wrote:
> >Henry takes care of two problems in the filament circuit with one
> >simple part. A power resistor (R617) in the primary of the filament
> >transformer limits inrush current and allows setting of the filament
> >voltage to the correct value for whatever line voltage that may be
> >encountered. A filament voltmeter is included,...
> Well, my 1999 manual only shows R617 in the two 3-phase
> PS schematics, but NOT in my single phase supply schematic;
> wonder why, or if the resistor is actually in the filament supply?
> And, R617 is not listed on the separate page which lists the
> power supply parts list.
> Anyway, very much appreciate the comments by all of you
> about the specs and use of this particular Henry amp. Very
> pleased with it, and runs just fine for me at amateur legal
> levels. Had it on for hours yesterday running CW practice
> on both 20 and 40 meters; except I just can't stand to sit
> and listen to 5 wpm CW, hi! Believe I am not going to be
> doing that speed again. Folks can get their CW up to
> at least 10 wpm, then I am going to offer lots of help to
> build skill beyond there.
> I am not going to worry nor bother anymore about what
> the actual input drive power might be; seems to be no
> point to it.
> 73, Jim KH7M
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