[Elecraft] FIXED--was NOT the feedline

Thu Jun 4 01:02:03 EDT 2020

I always use Scotch 130, (self fusing tape), first, then Scotch 88.  I 
cut the tape down the long axis, and it opes up like a peanut, leaving 
no residue or old tape.

73, and thanks,
Dave (NK7Z)
https://www.nk7z.net
ARRL Volunteer Examiner
ARRL Technical Specialist
ARRL Asst. Director, NW Division, Technical Resources

On 6/3/20 12:48 PM, Buck wrote:
> Electrical tape, then the self-fusing tape, then electrical tape.  The 
> first layer of electrical tape makes it easier to removing the fusing 
> tape later
> 
> Buck, k4ia
> Honor Roll
> 8BDXCC
> EasyWayHamBooks.com
> 
> On 6/3/2020 12:58 PM, Clay Autery wrote:
>> I've got to get to class, but there are a NUMBER of different methods 
>> and procedures that are used.
>>
>> Self-fusing tape properly applied covered by top-quality electrical 
>> tape to protect the self-fusing tape from UV...
>> There are specific points on installation that you want to observe.
>>
>> Someone will chime in with deatil or a reference to a procedure...  If 
>> not, I will do it later... Class in 3 minutes.
>>
>> 73,
>>
>> ______________________
>> Clay Autery, KY5G
>> (318) 518-1389
>>
>> On 06/03/20 10:35, Peter Dougherty wrote:
>>> 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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>>>> dave at nk7z.net
>>>>
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