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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