Re: [TowerTalk] Questions about Irrigation Pipe for Verticals

[Red <RedHaines@centurytel.net>]

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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