My C3i antennas: 50, 144, and 440 MHz all use a coax that looks like the
coax described. I don't know the designation of this coax, but it has
stood up well to the environment that appears hostile. What ever,
exposed solder just seems to dissolve away, but the coax itself stands
up well. PTFE, (Teflon^tm ) is "normally" a white compound with a wax
like feel.
As, Jim says, this coax is manufactured by quite a few firms in
different countries. There is no guarantee that the jacket is PTFE. It
certainly isn't if it fails when exposed to the weather. RG-400 looks
the same and is also expensive, but it stands up well. I don't think its
jacket it PTFE.
If we pay a premium price for coax and it fails (is not constructed
according to specs), I think it's time to complain to the seller and/or
the manufacturer/importer.
73, Roger (K8RI)
On 2/22/2017 7:33 AM, Jim Thomson wrote:
Date: Tue, 21 Feb 2017 21:24:16 -0500
From: Hans Hammarquist <hanslg@aol.com>
To: towertalk@contesting.com
Subject: [TowerTalk] Fwd: What am I missing....balun
This doesn't explain why PTFE should not keep up outdoors. Rather the opposite.
Hans - N2JFS
-----Original Message-----
From: Guy Olinger <k2av@contesting.com>
To: john <john@kk9a.com>
Cc: Towertalk <towertalk@contesting.com>
Sent: Fri, Feb 17, 2017 3:00 pm
Subject: Re: [TowerTalk] What am I missing....balun
See https://www.coleparmer.com/tech-article/uv-properties-of-plastics
73, Guy K2AV
## The outer jacket on 393 and 142 is not PTFE. PTFE is used for the
dielectric inside. PTFE aka terflon.
## Outer jacket is FEP-9 . These cables are made by everybody and their
dog.
Made in the UK, china, rfs makes it, so does times microwave, belden, and a
bunch more.
I suspect its either a quality control issue, or a tweak in the formulae,
rendering it semi useless
for UV outdoors. Im not going to take a chance, and will 88 or 33 tape it the
entire length.
Which is not vey much, so not an issue. Its too expensive as is, and 33 or 88
tape is cheap
insurance.
Jim VE7RF
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73
Roger (K8RI)
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