The BN-4000 that he has is a 4KW balun. I would not use a Hy-Gain BN-86 for
anything. I would worry more about the traps handling QRO, especially if
high power digital modes are used. There was a burnt TH7 trap on the wall
of the P49V station that was damaged from P49YL operating RTTY contests.
John KK9A
Richard Karlquist N6RK wrote:
I see you dug up one of my old posts. The only thing I would add to
that post is that is that anecdotal reports of using a tuner to extend
the bandwidth of such Yagi's may say "it seemed to work fine" only
indicate that no effective tests were done to measure it. Consider
this: the TH6DXX has 6 or maybe 7 dB gain over a dipole at best. Using
a tuner, the gain will never be less than a dipole. So it will work as
well as a dipole. For casual operation, that may work just fine. It's
only down 1 S unit.
Regarding baluns: The TH6 was designed when hams were limited to 1kW DC
input equivalent to 600W RF out on a good day. Using 1,500 W out may
blow the balun up, especially if you have high VSWR. Recommend you make
a homebrew balun as per K9YC's cookbook.
---
Rick Karlquist
N6RK
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