Posted by
Gary Winkelman on
Nov 20, 2009; 9:24pm
URL: http://elecraft.85.s1.nabble.com/BL-2-Balun-Heating-tp4035832p4040083.html
Thanks for all the advise! I've been running tests all day to which I
have a nice Excel spreadsheet. I've run the tests on 160 thru 10 meters
using my trusty MFJ-259B (couldn't live without it). I ran AT1KM - no
balun, BL-2 1:1, BL-2 4:1 and a W2AU bead balun 1:1, all thru the
AT1KM. All SWR, R & X values jived. I did not try running 125 watts
thru the balun during the tests. If it heated up, I'd have to let it
cool to get an accurate reading the next frequency. The test would take
2 weeks!
Finally, I took the advise to put the balun between the tuner and the
transmitter. Tuned fine so I added power. It stays cool as the
proverbial cucumber! One slight problem, the tuner is now RF hot. and
there's RF getting into my computer. If I reduce the power to 75 watts,
the computer functions. The transmitter is not bonded to the tuner.
Because of my circumstances, I am not able to use an RF ground rod. I
have two 80 foot counterpoises that run next to our house on the ground.
Thanks everybody for all your help!
73, Gary N2UM
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