In a message dated 4/23/02 3:42:33 PM Pacific Daylight Time,
ditzian@alltel.net writes:
> I have a TH6DXX that suddenly went bad. I found a problem with a
> barrel connector and replaced it, while the coax seemed to be OK.
> However, after using the coax for ten years, I decided to replace it
> with a single run, and I have some Davis RF 9914F on order.
>
> The BN-86 balun, however, is a question. I hate to butcher it to open
> it, but it is in question. I put things back together with a new
> barrel connector but the SWR is now higher than it used to be. It
> could be that the tower is at 20 feet instead of 60 feet. It could be
> that the old coax is at fault (I just ordered the 9914F), and it
> could be that there is a balun problem.
>
> (1) Can the BN-86 voltage balun be replaced with a W2DU-style current-
> choke balun?
Sure. A balun is a balun is a balun but sometimes matching the
manufacturer for both balun and antenna seems to work better. I substituted a
W2DU for a BN2000 on a TH7 and the swr went up slightly so we went back to
the BN2000.
> (2) Is there an advantage in using both?
>
Both? You mean in series? Not that I'm aware of.
BTW the BN-86 is a well known balun "fuse". It runs fine at less than
legal power but pops when you put a couple of extra watts thru it.
Cheers,
Steve K7LXC
TOWER TECH
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