You want to be careful of the maximum current and voltage - heat is not the
only issue - I remember some "50KW" Bird water cooled loads - and 50 KW was
it - If you ran 100 percent amplitude modulation at 50 KW the load would
pop - Bird said it was a voltage issue.
I once did some fusing current measurements on nichrome thin film
resistors - various sheet resistivities - and you could see little
"streamers" in the element before the element would fail .
Anyhow - just getting the heat out may or may not allow the load to
survive.
FWIW -- Hank K7HP
From: "Jim Nowotarski" <N3GOO@ARRL.NET>
To: <amps@contesting.com>
Sent: Tuesday, April 04, 2006 6:08 PM
Subject: [Amps] sealed air cooled dummy load in oil??
>> Date: Tue, 04 Apr 2006 12:21:52 -0400
>> From: "Gary Patterson" <gpatterson53@hotmail.com>
>> Subject: [Amps] sealed air cooled dummy load in oil??
>> To: amps@contesting.com
>> Message-ID: <BAY101-F247E2BA4F3BEF3ADD40EEDDACA0@phx.gbl>
>> Content-Type: text/plain; format=flowed
>>
>> Can one of those "finned", air cooled, sealed dummy loads be dumped
> into a
>> can of transformer oil (cantenna-like) and significantly increase
> its power
>> dissapation??
>>
> Generally yes, depending of course on your definition of
> "significant."
> I would suggest monitoring the temperature of the load. The oil will
> help transfer the
> heat from the load, but of course it won't increase the max
> temperature that the load can take.
> -
> Jim
>
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