Having the LP-100A on the antenna side is by design. I'm not much
interested in monitoring the antenna VSWR in real time, but I do want to
know the power being delivered at the tail end of the station RF lineup.
The "light show" on the KAT500 and the KPA500 (if it's being used) as
well as the internal indication in the K3 gives plenty of redundant
information about whether or not the antenna tuner is doing its job. The
unique vector measurement capability of the LPA-100A also makes it good
for maintenance checks. I periodically run the utility program to have
the LPA-100A measure the various antennas across their operational bands
and compare the results against historical data. This lets me see any
changes that might have occurred -- these changes would be masked by an
antenna tuner between the LPA-100A sensor and the actual antenna.
I actually use the KAT500 almost exclusively for tuning my 80 meter
inverted L, which is too long electrically but mechanically impossible
to tune properly. Although all my other antennas are resonant on their
respective operating bands I also leave the KAT500 on line to use as a
"line flattener" on 160 and 40 meters if I should operate outside of the
normal CW bands these antennas are tuned for.
73...
Randy, W8FN
On 8/13/2015 12:30 AM, Phil Hystad wrote:
Randy,
If your LP100A is on the antenna side of your KAT500 then you are putting your
LP100A in the region of higher SWR if your antenna is not close to resonance.
I think you would want to put your LP100A in the inboard side of the KAT500 so
that you are properly showing the “tuned” SWR on the LPA100A and your readings
will be more accurate I believe.
If you want to know the antenna side of the SWR, what the KAT500 refers to as
the Bypass SWR since it is the SWR you see if you bypass the KAT500, then you
can use the KAT500 utility program to display that.
I am not seeing the problems you describe. For example, when I run without the
TX Mon Sensor in place, there are absolutely no SWR problems at all (look again
at the configuration below that I have). I should also note that today I did
not see any problems with the SWR spurts I originally reported even with the TX
Monitor sensor inline.
73, phil, K7PEH
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