Randy,
That indicates that you do not have your KAT500 and amplifier properly
connected.
The KEYOUT line from the transceiver should go first to the KAT500, and
then from the KAT500 to the amplifier.
When the KAT500 needs to tune, the amplifier will not be keyed and
tuning will take place at the power output of the transceiver.
After tuning, the amplifier will be engaged.
73,
Don W3FPR
On 11/29/2018 7:42 PM, Randy Farmer wrote:
I've had difficulties with my KAT500 / KPA500 combo (only) on 160
meters, apparently due to the tuner relying on RF sensing. I've
carefully "trained" my KAT500 all across the 160 meter band. Since the
manual states that the tuning bins are 10 kHz wide below 3 MHz, I do a
tune at 1805, 1815 ... up to about 1895. My antenna is an impossible
load above 1900 kHz, so I don't try to tune up there. Since I don't have
exactly a great antenna system, I almost always stick to S&P operation
in 160 meter contests. As I tune across the band I can hear the relays
selecting the appropriate tuning solutions. But... every once in awhile,
as soon as I key the transmitter I hear the relays in the KAT500 switch,
presumably out of the commanded tuning bin due to frequency measurement
error in the RF detection circuit. This shouldn't be a problem, since
the tuning doesn't change significantly between adjacent bins. However,
since the amp is being keyed while the tuner is changing presets, the
amp immediately faults and goes off line. This is very annoying, and
probably not so good for either the amp or the tuner. If the RF
measurement resolution is really as poor as 8kHz, I don't see why
there's any point in providing for 10 kHz wide tuning bins on the low
bands. I would also strongly agree that if good frequency information is
available to the tuner via the serial bus that's what it should use to
select tuning bins. The RF sensing information should be a backup
source, to be relied on only in the absence of such data.
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