I had a similar problem during last weekend's ARRL DX SSB
contest. I would press tune on my K3 and the K3 would come to a
good solution using about 5W. Then I tried to transmit at 100W
and the SWR went wonky and the power folded back. I traced it to
a bad connection between the two sections of coax feeding the
antenna. Testing with a dummy load can help narrow the problem
down to antenna or other.
73 Bill AE6JV
On 3/8/21 at 10:42 AM, [email protected] wrote:
Over the past six months my KAT500 autotune function has
deteriorated to the point where I am getting frustrated. The
KAT tuner is connected to a G5RV via 75' of RG-8 coax and is
fed from a KPA-500 which is fed from a Kenwood TS480. I switch
between between barefoot and amplified transmissions. Upon
application of a 40 watt tune, the tuner appears to find a
suitable solution but when the power is raised to over 100W,
the amplifier faults to a high SWR, some bands, but not always
repeatable. The antenna and feedline have been inspected and
all OK. If I change bands sometimes it works at higher powers
and sometimes not. Other times it cannot find a solution on
some bands and other bands are OK, low power or amplified. If I
cycle the power to the KAT500, it is OK for a while and then it
has trouble again. The problem appears intermittent. Wondering
if anyone has had this same problem. Thanks de dave WB7ELY
-----------------------------------------------------------------------
Bill Frantz | Privacy is dead, get over | Periwinkle
(408)348-7900 | it. | 150 Rivermead
Rd #235
www.pwpconsult.com | - Scott McNealy (1999) | Peterborough,
NH 03458
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