Candidly, I would be more concerned about exceeding the RF Exposure
limits with this arrangement. Perhaps the "Tuner issue" is an
indication of such. From your description, at 100 watts you will likely
be way outside of the FCC limits of safe RF Exposure.
Now with that said, the amount of RF at the TUNE level is not such to
confuse the tuner. However at 40+ watts the RF back into the system is
more than the system can accurately handle. A bunch of #31 beads or #73
beads, where "bunch" = 50 pcs or more, on the feed line at the antenna
feed point and again a bunch at the radio. This may help the radio and
antenna problem associated with the auto tune routine. You may find the
same treatment required on the DC power cable at the radio.
73
Bob, K4TAX
On 1/30/2016 12:54 PM, Dauer, Edward wrote:
My KX-line tuner (the KXAT100 installed in the KXPA100 amp) recently
started an odd behavior. I wonder if anyone can help explain it. When
tuning into an indoor Buddipole set at resonance, the ATU finds a
near-perfect solution when the power applied during tuning stays below
about 40 watts. With the ATU set in “auto” however, if the power out is
higher than 40 watts the tuner hunts without stopping. I have watched
the
SWR readings change, often going briefly to 1.0 or 1.1:1, but the tuner
just keeps hunting, endlessly, even when the frequency is unchanged.
Yet
when it is first tuned at a lower power, either in Auto or Manual-tune,
and the ATU is set to Manual, it stays at the solution perfectly well no
matter how high the power goes. I can live with this, just by tuning at
low power and then switching to Manual, but I wonder why the Auto
function
works well up to a certain point but goes berserk at any power higher
than
that? Is the higher ERP sneaking back into the control circuitry
somehow?
Ted, KN1CBR
_
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