Cantenna Fluid? Need help finding some

[Bob Bruner WB4TAJ]

Heathkit gave you two options, mineral oil, and transformer oil.   That's why 
the high power end of the time/vs power graph on the side of the can  has two 
lines.  The dotted line is if you use mineral oil.  Mineral  oil doesn't go 
bad, so far as I know, but cheap as it is, who cares?  It  should be perfectly 
adequate for almost any amateur use.   My Cantenna  is filled with a substance 
known as Dow-Therm, which is used in high powered  dummy loads such as are 
used to test TV broadcast transmitters.  I have no  idea what's in it, or if 
it's still available.  I got mine from a guy who  had some, etc. . .  But it 
begins to "freeze" at room temperature. If you  open the can, you can see this 
giant crystal floating around  inside, which is frozen Dow Therm.  I have run 1 
kW commercial FM  transmitters into it at full power for ten or 15 minutes at a 
time and not been  able to boil it, so it must be pretty good stuff for dummy 
loads.  On the  other hand, I wouldn't leave it where the kids or the cat can 
get at it; it  smells ferocious, and I have no idea how safe it is for living 
things.
 
Bob Bruner
W9TAJ

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