[Antennas] What to put in a dummy load

2004年4月28日 19:35:43 -0700

Jim,
If it was designed to have oil in it, then you should replace the oil
before using it. You should not use the load without oil, since it is
the medium through which heat flows from the load element to the fins. 
It does not take much to permanently damage an uncooled dummy load, and
one that is rated at 200 watts is worth protecting.
If you can determine the maker and the model number, contact the factory
for guidance. If you put the wrong kind of oil in the load, you can
cause the rubber seals to soften and leak. Some organic oils can turn
rancid and possibly become acidic over time. It's worth the money to
get the proper oil.
Before you do anything, find out what happened to the original oil- if
indeed, there was any. If the oil leaked out through a crack or a bad
connector, that should be repaired first.
73, Eric Lemmon WB6FLY
Jim Isbell wrote:
>> I have a 200W dummy load that apparently once held oil. It is now empty.
> At least that assumption is made on the basis that the bottom of the
> container has a bellows loaded bottom to allow for expansion. There is
> no place to fill or drain it but I can cut a hole and add a filler cap
> real easy. Once open I can check for leaks and repair them. OK, now
> what is the best thing to put in it...or does it really matter that
> much.....Corn Oil is cheap and readily available. Is there any real
> advantage to mineral oil? Or is there any real advantage to some exotic
> concoction that I never heard of. What about a fan and lots of air, and
> no oil at all.?
>> - - -
>> Your moderator for this list is:
> Larry Wilson KE1HZ [email protected]
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