Posted by
Dave wo2x on
Sep 16, 2019; 12:04am
URL: http://elecraft.85.s1.nabble.com/Reflected-power-tp7655160p7655161.html
Check your connections. Loose or poor PL-259s. Also check to see if the
antenna is close to something causing it to arc over. I had one antenna that
used ladder line with solid conductors. Due to it moving around in the wind
one of the conductors developed a break which tested fine under low power or
with an analyzer but would have problems at higher power. I've since moved
to Davis RF copper clad stranded ladder line.
Dave wo2x
-----Original Message-----
From:
[hidden email] <
[hidden email]> On
Behalf Of Stephen Rabinowitz
Sent: Sunday, September 15, 2019 7:58 PM
To:
[hidden email]
Subject: [Elecraft] Reflected power
My KPA-1500 switches from operate to standby due to reflected power more
than 200w whenever drive power exceeds about 8 watts on 7 MHz. The forward
power at that point is about 400w. The antenna is a double bazooka that
shows an SWR of about 1.2 on a RigExpert AA-230Pro antenna analyzer. A
Telepost LP-100A digital wattmeter shows SWR 1.3 with Z=52, R=49, Ph=17, and
X=15. The KP1500 tunes to an SWR of what it labels 1.1 on that frequency.
The latest firmware, version 2.27 is installed. This problem does not occur
with double bazooka antennas on 80m or 30m, or with Yagis from 20m to 6m. It
seems to me that there is a brief surge in reflected power at the very onset
of the transmission that triggers the response, but that the reflected power
quickly decreases to normal levels of just a few watts. Any ideas for
dealing with this problem would be much appreciated.
73, Steve K2SN
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