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@karlquist.com>
> To: "Red" <RedHaines@centurytel.net>
> Cc: "TowerTalk" <towertalk@contesting.com>; "Gary Schafer"
> <garyschafer@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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>>> TowerTalk@contesting.com
>>> http://lists.contesting.com/mailman/listinfo/towertalk
>>>
>>>
>>
>>
>> _______________________________________________
>>
>>
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