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Re: [Amps] How about this furnace?

To: amps@contesting.com
Subject: Re: [Amps] How about this furnace?
From: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>
Reply-to: g3rzp@g3rzp.wanadoo.co.uk
Date: Mon, 2 Jan 2006 10:57:55 +0100 (CET)
List-post: <mailto:amps@contesting.com>
What puzzles me about this size amp in ham use is where you get the AC power 
from for it. If you ran it at full whack, you'd be needing to peak around 20kW 
from the mains, or around 100 amps from a single phase on 220volts. (let's not 
imagine running it from 115!) So you'd probably need 3 phase, which isn't 
standard domestically..... Running it 'conservative' still means a lot of 
filament power - 781 watts, according to my Eimac data.
So for emergency comms, you'd need a damn big generator - or battery (sic), 
while for 'normal' use, you need to be pretty well heeled just to pay the 
electricity bill.
Antenna requirements at this sort of power level are a problem, too, with 
flashovers, corona and all sorts of difficulties.
Life may be too short for QRP, but the difficulties of this sort of level of 
QRO start getting a bit much for an amateur installation.
73
Peter G3RZP
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