Date: Thu, 12 May 2016 16:53:27 +0000 (UTC)
From: Russ Dearmore <champsruss@yahoo.com>
To: "TowerTalk@contesting.com" <TowerTalk@contesting.com>
Subject: [TowerTalk] Force 12 20M Monobander
Rick,? Thanks for your comments.? I found the F/B to be much higher than you
did so maybe we're talking about different antennas.? The OP-Des design of the
Force 12 is probably the reason for better gain and flatter SWR.? I've got more
confidence in the 5kw power rating than the 1.5kw of the 204BA since I use a
manually tuned amp that wants to go higher than that.? I'll probably keep
looking at the new designs rather than the old technology.? In regards to the
SteppIR I'm not comfortable with the extra maintenance they are well known
for.? Needlessly expensive in the long run. ?? I also share your skepticism
about antenna manufacturer's claims and think it's time for a monobander
comparison test like Ward did with the Tri-banders some time back. ?? Thanks
again, Russ? K5ZZR ?
## say what ? The only power limit on any 204BA is the balun used with it.
The 204BA will take anything you can throw at it.
Nobody is about to melt 1.25 inch OD AL tubing any time soon. The insulators
used on any of these monobander Driven eles
have plenty of HV stand off. Even with 20 kw out, the rms voltage is only
1000 vac. And the peak V is only 1414.
20 kw = 20 A into 50 ohms. 20A wont put a dent on any Al tubing. The only
power limitation on any of these mono banders is
the balun, coax used, and connectors. Nobody ever blew up a 7-16 Din
connector.
Jim VE7RF
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