On Jan 2, 2006, at 3:19 AM, pa3duv@planet.nl wrote:
> Peter,
>
> On the EU mainland 20 kW input @3 phase mains with 400 VAC between the
> phases will result in 17 A per phase.
> I reckon from am a standard house mains inlet one can run a 30 kW
> amplifier and use the dishwasher, microwave and cook a decent stir fry
> wok at the same time.
On SSB, using a 3-ø resonant-choke HV filter, I agree, but not with a
C-input filter or AØ tuneup.
>
> A RF tetrode in class AB1 @ 30 kw could deliver approx 20 kW RF output.
30k in 18k out is doable without a prayercloth.
cheers, Dick
> The 10 kW loss in heat could be used to heat ones house. My 7.5 kW
> woodburner is sufficient to heat my house at -10 degrees C ambient
> temperatures so 10 kW from the amplifier should be more than
> sufficient.
>
> Cheers, Dick Knol
> PA3DUV
>
>
>
>
>
>
>
> ----- Oorspronkelijk bericht -----
> Van: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>
> Datum: maandag, januari 2, 2006 10:57 am
> Onderwerp: Re: [Amps] How about this furnace?
>
>> 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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>
Richard L. Measures, AG6K, 805.386.3734. www.somis.org
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