I usually do testing in CW or SSB. In CW the duty cycle is 50% and in SSB
about 10% with not too much processing. A few seconds is enough to diagnose
problems.
Years ago when testing a 200W home made amp I used 2W resistor immersed in
water. Worked good enough.
Perhaps for longer duty one can use cantenna dummy load ( MFJ-250), also
immersed in water. Or attach 1-2 small fans to MFJ-264.
Ignacy, NO9E
On Wed, Jul 24, 2019 at 11:06 AM Larry Gauthier (K8UT)
wrote:
> Don,
>
> Look carefully at the power de-rating curve on your MFJ-264. I also own a
> KPA1500, and built my own DIY high power dummy load after seeing that my
> MFJ "1500 watt" dummy load can only handle 1500 watts for 8 seconds.
>
> -larry (K8UT)
>
> -- Original Message --
> From: "Don Schroder"
> To: "Ignacy" ; "elecraft@mailman.qth.net" <
> elecraft@mailman.qth.net>
> Sent: 2019-07-22 21:21:09
> Subject: Re: [Elecraft] KPA 1500 dummy load recommendations
>
> I also have a MFJ-264. I figured if I need a dummy load, go with one that
> will handle the most watts I will ever need.
> I don’t have much room, the MFJ-264 id s 1.5KW dry dummy load for
> 1-650MHz. A little smaller than a carton of cigs.
> Haven’t used it yet.
>
> Don, KE0PVQ
>
> Sent from Mail<https://go.microsoft.com/fwlink/?LinkId=550986> for
> Windows 10
>
> From: Ignacy<mailto:n...@arrl.net>
> Sent: Monday, July 22, 2019 7:43 PM
> To: elecraft@mailman.qth.net<mailto:elecraft@mailman.qth.net>
> Subject: Re: [Elecraft] KPA 1500 dummy load recommendations
>
> I have MFJ-264 and MFJ-250. Both work. Aside from experiments , both are
> gathering dust as there is little purpose of using dummy loads for
> solid-state amps.
> Ignacy, NO9E
>
>
>
> --
> Sent from: http://elecraft.365791.n2.nabble.com/
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