When I had a TH-7, I replaced the BN-86 with the BN-4000. The latter worked
fine for high-power contesting for years. The replacement was induced by a
mechanical failure of the BN-86 that was unrelated to transmission power
(the balun exploded when the coax on my tubular crankup snagged -- a long
I recently tried to replace a BN-86 or BN-4000 (can't remember which) on a
friend's TH-7 with a Cal-AV FB-1 choke balun. It didn't work -- the SWR was
too high and inconsistent across the band. Neither of us understood why this
didn't work. As far as I know, the BN-86 and BN-4000 are 1:1 baluns, right?
73, Dick WC1M
> -----Original Message-----
> From: Carl [mailto:firstname.lastname@example.org]
> Sent: Wednesday, February 18, 2004 10:09 AM
> To: Lee Buller; Bernard
> Cc: TowerTalk Reflector
> Subject: Re: [TowerTalk] BN-86
> I think the BN4000 current balun is a good replacement for
> the BN86 if it's still made.
> Carl K8AV
> > I haved done this on a TH6DXX just four years ago. Lets
> just say the
> > BN86 will fail when using full output of an amplifier for
> long periods of time. I have seen one burned up in my life.
> What I did was to put a RadioWorks 4 KW balun on my TH6DXX
> and works just fine. I used a couple of hose clamps to
> attach it to the boom. IT has bee up four years and haven't
> any problems. The only problem I have is the end caps get
> brittle and water gets into the traps. Have to replace them
> every 4-5 years.
> > Bernard <email@example.com> wrote:
> > I am going to replace the BN-86 on my TH7 this Spring. I am
> > if anyone has bought a BN-86 since MFJ took over the
> Hy-Gain operation? If so, what do you think of the quality of
> the balun?
> > Anyone have any ideas for a "quality" balun to replace the BN-86.
> > 73
> > Bernard, WA4OEJ
See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless Weather
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