Pete,
When I refurbished my Heath HN31 Cantenna (overheated resistor), I replaced the
olde unknown oil with transformer oil. It was free from my electric utility's
transformer shop. A few phone calls, and I tracked-down the supervisor, who was
happy to give me a gallon. The trick was getting their gnarly fill pump to
supply ONLY one gallon. Even if I had to buy transformer oil, I would NEVER use
anything else.
Since then, I built a 1500W dry dummy load that can take 1500W at 100% duty
cycle (unless I run out of cooling air). Leaks are also not an issue. I just
pick the dust bunnies out once in a while. The Cantenna now sees no more than
100W (the Kanthal-Globar #886SP resistor is rated only 90W @ 40°C). If
necessary, MFJ sells transformer oil.
vy 73 es gl,Bryan WA7PRChttp://www.tinyurl.com/wa7prc-dummy
Date: Sat, 28 Nov 2015 12:25:43 -0500
From: Pete Smith N4ZR
To: TowerTalk <TowerTalk@contesting.com>
Subject: [TowerTalk] Oil for Dummy Load
My Cantenna-type dummy load developed a pinhole leak in the can, and all
the mineral oil drained out. I have several gallons of clean (unused)
peanut oil left over from Thanksgiving. Is there any reason not to use
this instead? From internet sources, the flash point appears to be
higher than mineral oil.
--
73, Pete N4ZR
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
|