[TowerTalk] Polarity question..on a dipole

[jimlux]

On 3/31/17 2:17 PM, Doug Smith wrote:
> Voltage at dipole tips — it’s a kind of interesting question.
>
> I was thinking of putting a dipole in a stand of aspen trees which I
> do NOT want to burn down.  There is no way to route the wires to
> completely avoid contact with the twig-like upper branches.  And, I
> do run full power.
>
> I did find some high voltage wire by Gore that is rated at 13 KV
> although I’m not sure that was at RF — might have been DC.  It is
> insulated with PTFE.  Looked interesting..

what you want is GTO-15 Tube Sign & Ignition Cable (aka wire) - used for 
wiring neon signs - typically a tough, black outer covering, dielectric 
layer inside, and AWG14 wire

It *is* a bit pricey (0.50/ft?) in small quantities

It's used for wire antennas on boats, too (so you can buy it at West Marine)

They make a wide variety of flavors and colors.. all silicone, thinner 
and more flexible, etc.








>
> The idea of looking at the feed point impedance of a 1 wavelength
> doublet for a first order approximation is a good one.  I may try
> modeling that, just to bring closure to my idea..
>
> 73, Doug, W7KF
>