[TowerTalk] Questions about Irrigation Pipe for Verticals

[Rick Karlquist]

You don't understand what I meant.  I transition between pipe
sizes with PVC pipe couplers.  This gives me an insulated
joint.  If I don't want an insulated joint, I "aluminum plate"
the PVC pipe with the stove pipe tape continuing off the ends
onto the irrigation tubing.

Rick N6RK


Bob Maser wrote:
> 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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>>
>>
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