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Re: [TowerTalk] 1/4 wave sloper attachment

Subject: Re: [TowerTalk] 1/4 wave sloper attachment
From: K8RI <>
Date: Mon, 02 Jan 2012 14:08:42 -0500
List-post: <">>
On 1/2/2012 7:27 AM, Mike wrote:
> On 1/1/2012 5:34 PM, K8RI wrote:
>> On 1/1/2012 1:56 PM, Mike wrote:
>>> I need to replace the attachment for my 160/80 meter 1/4 wave sloper (fed 
>>> at the same
>>> point, attached to one leg of the tower). I'm currently using an 
>>> Alpha-Delta sloper
>>> connector, but it's in bad shape after 19 years. Suggestions?
>> This is what I did:
>> An example of how it
>> mounts to the tower leg.

To to along with the photos, I took a piece of 3/4 X 1/8" Aluminum  
about 8 or 10 inches long. Securely clamped the Aluminum in the drill 
press, drilled the hole for the SO239 using progressively larger drills  
so they didn' take too big a bite at one time. After the SO239 became a 
slip fit, I clamped the piece in a vise to make the 90 degree bend. I 
thoroughly  sealed the fitting using flooded heat shrink and liquid 
electrical tape.  Just in case there is also a drip loop that 
immediately goes higher than the connection when installed. The two SS 
hose clamps are all I use to hold the fitting. The insulator is held to 
the tower by a short piece of 3/16 nylon braided rope. This removes the 
strain from the fitting.

I had to move the resonance from the bottom of 160 to around 1925 or 50. 
With the antenna resonant lower, the tuner would arc with much more than 
a 100 or 200 watts when I'd try to operate near the top end of the 
band.  This would be a great place to mount a remote tuner and feed the 
half sloper like an end fed wire.


Roger (K8RI)
>> I would add one of the 6 #31 2.4" core, 6 turn chokes at the feed point
>> though.
>> 73
>> Roger (K8RI)
> Thanks, Roger -
> Very elegant. One of those chokes is in use already. :-D
> 73, Mike NF4L
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