[Elecraft] KPA1000

[Joe Subich, W4TV]

> Sure, you can run a 1KW room heater from 110V... so what if the line
> voltage sags to 100V on that circuit.. the heater will just deliver a
> bit less heat.

If the voltage sags to 100V you are likely to cause a serious fire.
A 1 KW heater will draw roughly 10A ... 10A at 20 to 25V (the drop
in the lines/outlet/etc.) represents 200 - 250W dissipated in a closed
space behind your walls, typically close to combustible studs and
drywall.

If you see significant voltage drops on a circuit like that, you had
better get it fixed promptly or hope your homeowners insurance and
smoke detectors are both working 110%.

73,

    ... Joe, W4TV


On 2014-12-24 11:00 AM, Ray Sills wrote:
> Another consideration for a KPA1000, would be the almost certain need
> for 220V power.  Fine and dandy if it's already in the shack, but
> certainly an extra cost.  Sure, you can run a 1KW room heater from
> 110V... so what if the line voltage sags to 100V on that circuit.. the
> heater will just deliver a bit less heat.  Or my vacuum cleaner (which
> draws 12 A) works fine on about 110V.  But, a linear amp will want to
> see a pretty stiff power supply to maintain linearity.
>
> 500 W is pretty much OK on household 110 V branch circuits.  And, as
> others have pointed out... the whole amp with power supply fits into a
> K3 sized case.  Pretty slick engineering, I say.  But, I'm a QRP guys,
> so all this discussion is a theoretical item for me.  :)
>
> 73 de Ray
> K2ULR
> KX3 #211
> ARL sixty one
>
>
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