[TowerTalk] PL259 Cobbectors Part 2 - Murray W9EHQ

[Roger (K8RI) on TT]

I have a 7L six. 11L 440, and 12L 144. All C3i antennas.  Too bad they 
are no longer available.
I worked the world on six the previous cycle peak

The 144 and 440 C3i antennas were plenty broad banded, but I did nothing 
special with them. I did work a couple gulf coast states on the lower 
portion of the 2-meter band.

73

Roger (K8RI)


On 5/14/2016 Saturday 10:51 AM, Jim Thomson wrote:
> Date: Sat, 14 May 2016 03:08:04 -0400
> From: "Roger (K8RI) on TT" <K8RI-on-TowerTalk at tm.net>
> To: towertalk at contesting.com
> Subject: Re: [TowerTalk] PL259 Cobbectors Part 2 - Murray W9EHQ
>
> Yes and it does!
>
> Liquid electrical tape is about the only thing that works and stays.  I
> will be using it where the matching coax ts soldered in on the C3i
> antennas.  I was really surprised to find the solder joints gone on the
> 144 and 440 antennas.
>
> Epoxy works, but it deteriorates over a few years where the outer layer
> of the liquid tape only dulls a bit, which I believe is due to dust
> settling or "stuff" in the rain.  At-any-rate the liquid tape remains
> viable as long as I've had it up so far. (Not quite 12 years)
> (bottom photo on link) http://www.rogerhalstead.com/ham_files/tower.htm
> Click on photos for a larger view.
>
> Unfortunately I have no current photos as that is now near the top of
> the tower that I can no longer climb.  I might give the 500mm telephoto
> lens a try.
>
> I'm going to add a common mode choke of 8 turns of RG-400 on 7 cores as
> it is an end fed quarter wave fed against the tower. I've been thinking
> about a number of coils in a box switched in at the feed point to add
> length, so I can switch the resonant point down.  I believe that will be
> more efficient than just a tuner in the den, or shop.
>
> 73 es thanks.
> Roger  (K8RI)
>
>
> ##  a  c3i is a 6m yagi.   On any of these f12 yagis, or similar, I use
> 10 ga  silver stranded teflon wire, with heavy duty crimp lugs, for the
> 10-24  machine screws going through them.   After crimping them, I also solder them.
> The completed lug then resides between  2 x  SS flat washers, with a
> split ring ss  lockwasher outboard of that, then a pair of SS nuts outboard
> of that.  Then put what ever  goop you want on the hard ware.
>
> ##  Im not fond of using SS hardware for ant connections to an AL  DE.
> Phosphor bronze hardware is what the big boys all use in the commercial world,
> for their  1-300 kw HF  AM SW  arrays.   SS  will turn black if you put enough
> current through it.
>
>
> Jim   VE7RF
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-- 

73

Roger (K8RI)


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