No, and I wasn't sure how to accomplish this. It's stainless hardware,
but
I'm guessing I should probably wrap the feedpoint up in self-annealing
tape
and Scotch 88 just to be safe.
- pjd
-----Original Message-----
From: elecraft-boun...@mailman.qth.net
<elecraft-boun...@mailman.qth.net> On
Behalf Of Dave Cole
Sent: Wednesday, June 3, 2020 7:27 AM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] FIXED--was NOT the feedline
Hi,
Is the open end of that feedline where it connects to the antenna
weatherproofed?
73, and thanks,
Dave (NK7Z)
https://www.nk7z.net
ARRL Volunteer Examiner
ARRL Technical Specialist
ARRL Asst. Director, NW Division, Technical Resources
On 6/2/20 8:15 PM, Peter Dougherty wrote:
HI all,
A postscript to the problem. First off, a huge thank you to the many
replies received. I was fortunate that the problem was not in the
KPA-1500
as I'd originally feared.
Much troubleshooting within the past few days. Originally the amp was
"iffy" on the old M-squared 6m5, and problematic (faulting) during
damp or
wet weather. This prompted the replacement of both the antenna and
feedline.
The hard faults were still occurring, until it was suggested the Ten-Tec
238 tuner that I was using exclusively for the built-in antenna switch
was
now the issue. I took this out of line today, and lowered the tower to
fine-tune the LFA's feed point and now everything is humming along just
nicely. The KPA-1500 is happy at 1.5 kW and showing an SWR of 1.2 in dry
conditions. I will keep my fingers crossed that the wet weather
expected in
the next day or so won't bother it all that much.
The final step was to move the 6m feedline from the secondary inlet
box to
the main antenna switch on the big tower. The downside here is I now
have an
additional 70 feet of BuryFlex in the line, so I'm guessing a total of
about
1.5 to 1.7dB of feedline loss. This is something I would like to
address in
the future with an eye to dropping it below 1dB.
Screencaps:
https://www.dropbox.com/s/1y4vyd17pbgq8ty/6m%20via%20the%20antenna%20s
witch.png?dl=0
And
https://www.dropbox.com/s/5x8n0bum4nwcxqp/6m%20LFA%20-%20SWR%20after%2
0tuning.png?dl=0
And for the balun discussion, this is what's in place, before the
double-walled heat-shrink was applied:
https://www.dropbox.com/s/18pgthl67rtq3bl/2020-05-31%2017.51.08.jpg?dl
=0
- pjd
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