[Antennas] Ladder line use with beams

Fri, 25 Jan 2002 08:30:53 -0500

-----Original Message-----
From: Peter Petschik=20
Sent: Friday, January 25, 2002 8:26 AM
To: '[email protected]'
Subject: RE: [Antennas] Ladder line use with beams

Jerry, a great idea as far as cost, however, many polyethylenes UNLIKE
CPVC may not contain UV or ultra violet inhibitor in the compounding
process. This additive requires confirmation from the manufacturer.
CPVC tubing by nature of the compounding process is UV inhibited and
should give some degree of longevity in direct sunlight.  Polyethylene
products without a minimum of .05% UV inhibitor may break down in two to
three years similar to the construction cover sheeting. =20

I offer this as a former plastics manufacturer in hopes of saving
someone a great deal of time and distress.  Happy experimenting.

73, Pete n1nnt=20

-----Original Message-----
From: Jerry Flanders [mailto:[email protected]]
Sent: Thursday, January 24, 2002 11:56 PM
To: [email protected]
Subject: Re: [Antennas] Ladder line use with beams

Ar Home Depot, you can get a 25 ft coil of 1/2 inch dia plastic tubing=20
(translucent, looks like polyethylene) meant to be used as the water
line=20
for the refrigerator's icemaker. I bet it would make good open wire=20
insulators. I don't use the stuff, or I would try it myself. Pretty
cheap=20
to try it - 25 feet for less than $2.

Jerry W4UK

At 10:08 PM 1/24/2002 -0500, you wrote:
>
>As for 'low-loss', homemade open-wire  .. the worst spacers are
probably
>those wooden sticks, boiled in parafin .. the best are probably ceramic
>[terribly fragile and costly], but you can manufacture some excellent
>spacers from small diameter teflon or delrin tubing.  Another choice is
>those 'clear-plastic' tubes that are used to ship/store high-quality
>bits for boring machines.  They are about 5" long and .5" in diameter.
>If there is a machine shop near you, it can't hurt to find out if they
>throw those plastic tubes away or save them in a 'barrel' .. [that's
>where I found mine!].  BTW, those tubes  also have end-caps that work
>super on .5" element tips!
>
>Good luck!
>Don
>N8DE

- - -=20

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