This is the method I use too except I like to wrap the innermost tape
layer sticky side out then overlap its ends with the next layer. This
way, if you have to open the connection in the future, there is never
any sticky residue on the connector. The Scotchkote is susceptible to UV
and needs to be covered by another layer of tape.
I sometimes have trouble finding self vulcanizing tape. Any suggestions
for a quality, uninterrupted supply?
Les W2LK
K7LXC@aol.com wrote:
>
> In a message dated 7/19/2007 1:06:42 A.M. Pacific Daylight Time,
> wwdxc@yahoogroups.com writes:
>
> > I forgot to mention, also, that the use of barrel
> connectors is discouraged, particularly in outdoor
> runs. Somehow corrosion always seems to occur in these
> connectors, causing the swr (and losses) to rise.
>
> I think the gist of this thread is weatherproofing. I've installed
> dozens (hundreds?) of barrel connector and other coax joints over the years
> and don't know of any that've failed. Most amateurs make one or more
> mistakes
> when weatherproofing coax joints.
>
> First, use 3M 33 or 88 tape. The 3 for a buck stuff from the
> hardware store won't cut it.
>
> Next, use 2 pairs of pliers to seat the connectors to the barrel
> connector. I'm not talking about deforming the PL259 - it's just that finger
> tight is not enough.
>
> Wrap 2-3 wraps of tape over the joint. Use a 50% overlap. Apply
> vapor wrap (butyl rubber - there are a number of variations) over the joint.
> Wrap
> 2 more layers of tape over the vapor wrap. If the coax runs vertically, the
> last wrap should go up. That'll make the water run off like shingles on a
> roof. Wrapped the other way and you've got a perfect duct for the water to
> get
> into the connection.
>
> Jim, you said you used these materials but maybe there was a step
> you missed or something. Following the above scenario will give you a
> bombproof
> joint. Even leaving off the vapor wrap will still result in a reliable
> weatherproof connection. Some commercial installers spray the finished joint
> with
> clear Krylon spray paint which is more belt-and-suspenders approach.
> ScotchKote has been used in the past but it's really for buried connections
> and will
> dry up and flake off when used in an outdoor application like this.
>
> Cheers & GL,
> Steve K7LXC
> TOWER TECH -
> Professional tower services for hams
> Cell: 206-890-4188
>
>
>
>
>
>
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