[Elecraft] Dummy loads for dummies

[Merv Schweigert]

They make similar resistors up to 800 watt or more,  see them on ebay
all the time,  they are even made in 25 ohm or 100 ohm so you can
series or parallel them to what you need,  easy to make a dummy load that
will handle many KW with just a couple.  Large heat sink needed.
> Makes me curious about designing with these TO-220 resistors in the 1000
> Ohm size of appropriate power rating...  Parallel 20 of them like folks
> do on the axials that they put in the can type dummy loads with oil.
>
> Options:
>
> 1) 20 in parallel on a finned copper or bare aluminum sink of sufficient
> size and then entire assembly in a oil wetted container.
> 2) Same, but only the finned side of the finned/pinned heat exchanger in
> a coolant bath.
>
> I'd like to have a rugged, high power, key down load built from easily
> obtainable and replaceable parts.
>
> ______________________
> Clay Autery, KY5G
> MONTAC Enterprises
> (318) 518-1389
>
> On 12/27/2016 5:52 PM, Mel Farrer via Elecraft wrote:
>> One thing I might also add in.  I use the Film TO-220 style non-inductive resistors with a heat sink in the 200 ohm 1% configuration to test 4:1 baluns at 100 watt level to confirm non saturation on the small QRP baluns I make.
>> Mel, K6KBE
>>
>>
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