[TowerTalk] Questions about Irrigation Pipe for Verticals

[Rick Karlquist]

You can use aluminum stovepipe tape to bridge the gap.

Rick N6RK



Red wrote:
> Hi, Gary;
>
> The coupling between a 2" OD and a 2.9" ID (the two pipes) is 46
> picoFarads per foot.  Guess we better put in the aluminum connections.
> The reactance of 46 pF is 124 Ohms at 28 MHz and 870 Ohms at 4 MHz, at
> one foot of overlap.  Hope I didn't lose a decimal place.  It's
> bedtime!  Better double check my calculations.
>
> 73 de Red
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