[TowerTalk] What am I missing....balun

[Roger (K8RI) on TT]

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 at aol.com>
> To: towertalk at 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 at contesting.com>
> To: john <john at kk9a.com>
> Cc: Towertalk <towertalk at 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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