[Antennas] Splicing Coax

Thu, 13 Jun 2002 22:45:05 -0400

It is my understanding that the impedance of any coax is a function of the
distance of the outer shield to the inner center conductor and the material
between them.  Once you make a splice without a proper connector you have lost
this ratio and no longer have the proper impedance.  The result is high SWR. For
receiving you may not notice a difference but for transmitting it is a whole
other story.  I have seen hard-line that was dented cause high SWR at 800mhz and
above.  I'm sure the same applies here.  So here is another vote for proper
termination if I am correct and I am sure someone will correct me if I am
wrong.  Jacqui N1DVE

Jan Reimers wrote:

> Any body have any tips/tricks for splicing coax (for example RG213 or RG8/U)
> rather than using connecters/unions?
>
> I was thinking of
> 1) removing half the center conductor strands on each side and soldering
> them together.
> 2) slip on a sliced piece of insulator over the joint.
> 3) somehow fudge the braid back on top.  (how to solder without damagaing
> the insultor material?)
> 4) Perhaps seal with heat shrink tubing.
>
> usage would be VHF and below.
>
> Why do I want to do this?
> 1) I am always running out of PL259's
> 2) A good splice should be less lossy than a 259-barrel-259 junction.
>
> Thanks
> Jan (VA7JNR)
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