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Re: [TowerTalk] Grey PVC Loading Coil

To: Jim Lux <jimlux@earthlink.net>
Subject: Re: [TowerTalk] Grey PVC Loading Coil
From: Don Havlicek <n8de@thepoint.net>
Date: Mon, 04 Dec 2006 12:46:40 -0500
List-post: <mailto:towertalk@contesting.com>
I bought seven 100' coils of copper tubing about 5 years ago .. hidden 
in the garage .. but available, if anyone else needs some, LOCALLY.
Don
N8DE

Jim Lux wrote:

> At 08:57 AM 12/4/2006, Don Havlicek wrote:
>
>> Why not use copper tubing which is available at those 'despot' type 
>> stores?
>> Copper is much easier to work with [and solder taps where needed] than
>> aluminum.
>
>
>
> And MUCH more expensive.  Aiee.. I just bought some 1" pipe elbows 
> $4-5 each!
> I'm keeping that 100 ft spool of tubing hidden away.
>
>> Don
>> N8DE
>>
>> Keith Dutson wrote:
>>
>> >Why not make the coil from small aluminum tubing without leaving the 
>> form in
>> >place?  It would be easy to adjust.
>> >
>> >73, Keith NM5G
>> >
>> >-----Original Message-----
>> >From: towertalk-bounces@contesting.com
>> >[mailto:towertalk-bounces@contesting.com] On Behalf Of Dan Zimmerman 
>> N3OX
>> >Sent: Monday, December 04, 2006 10:42 AM
>> >To: towertalk@contesting.com
>> >Subject: [TowerTalk] Grey PVC Loading Coil
>> >
>> >In the spirit of "some antenna is better than no antenna at all," 
>> I'm going
>> >to add a base loading coil to for 160m to my 40 foot vertical
>> >(http://www.n3ox.net/projects/lowbandvert).
>> >
>> >I know it's a substantial compromise over other forms of loading, 
>> but I'm
>> >willing to accept the efficiency penalty for convenience in this 
>> particular
>> >case.  What I want to know about is whether or not grey PVC electrical
>> >conduit is suitable for coil forms at 1.8MHz.  I searched the 
>> archives and
>> >found a discussion on PVC formers for HF and that they're not 
>> unacceptable
>> >unless you're running many close-spaced turns, but I wonder if 
>> people have
>> >tried grey vs. white and what they've found.  I know the microwave 
>> trick is
>> >routinely used but I don't think absorption at 2.4GHz says much 
>> about the MF
>> >properties of the material.
>> >
>> >I've got access to some 5" conduit and a lathe; a few minutes and I 
>> can have
>> >a beautiful coil form like the 80m one on the page above, but I 
>> wonder if
>> >the grey PVC is lossier than the white stuff?
>> >
>> >There are plenty of other approaches, but if grey PVC is decent at 
>> 1.8MHz,
>> >I'm just going to cut a nice  groove in it and go.  It's going to be
>> >something like 20-30 turns of #10 wire and having a grooved form 
>> makes for a
>> >quick and solid coil.
>> >
>> >73,
>> >Dan
>> >_______________________________________________
>> >
>> >
>> >
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>> >
>>
>>
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>
>
>
>


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