[TowerTalk] Questions about Irrigation Pipe for Verticals

[Bob Maser]

Stovepipe tape??  Tacky.  Use aluminum pop rivets.  I used them and had no 
problems for the 7 years that my 4 square was up.  If you're worried about 
conductivity between the two adjoining sections,  just run more power!!

Bob W6TR
----- Original Message ----- 
From: "Rick Karlquist" <richard at karlquist.com>
To: "Red" <RedHaines at centurytel.net>
Cc: "TowerTalk" <towertalk at contesting.com>; "Gary Schafer" 
<garyschafer at comcast.net>
Sent: Saturday, November 04, 2006 2:18 AM
Subject: Re: [TowerTalk] Questions about Irrigation Pipe for Verticals


> 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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