[Elecraft] FIXED--was NOT the feedline

[Peter Dougherty]

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-bounces at mailman.qth.net <elecraft-bounces at mailman.qth.net> On
Behalf Of Dave Cole
Sent: Wednesday, June 3, 2020 7:27 AM
To: elecraft at 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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