I also use M-17 - RG 400 MIL-17-G v on my Balun , line isolators and all
in shack coax.
It's Double Shield ,stranded Center Cond and Silver-plated TFE insulation
and jacket.
I had made a few 20 years ago open construction on Plexiglas .250
thickness..... the Plexiglas fell apart from WX and UV but the Balun hung by
it's connection wire to the beam and the coax RG214 ( it's now inside a
PLASTIC NEMA box... )
Wayne W3EA
________________________________
From: TowerTalk <towertalk-bounces@contesting.com> on behalf of Stan Stockton
<wa5rtg@gmail.com>
Sent: Friday, September 22, 2017 7:21 PM
To: Grant Saviers
Cc: towertalk@contesting.com; jim@audiosystemsgroup.com
Subject: Re: [TowerTalk] CM Choke Cookbook
RG-400 is way better in my opinion because of stranded center conductor.
Stan, K5GO
> On Sep 22, 2017, at 6:01 PM, Grant Saviers <grants2@pacbell.net> wrote:
>
> I've made 20+ with RG142 using the "cookbook" smaller coax turns and core
> counts, 160 to 10. Measured with my VNWA the L & R values are near the
> expected. The TFE is UV resistant and some chokes are in PVC junction boxes
> and some not. At 6m the RG142 is at its QRO limit, below that it is fine
> QRO+. My 142 is the double braid silver plated version, it comes both ways
> with the same obsolete RG unless it is MIL marked as mine is.
>
> Grant KZ1W
>
>> On 9/22/2017 13:48 PM, Jim Brown wrote:
>>> On 9/22/2017 8:16 AM, David Needham wrote:
>>> I have made several full power CM chokes for 80m and 160 m using RG213 and
>>> Mix 31 toriods per your articles. Do the number of cores or turns count
>>> change if I use RG142 for lighter weight?
>>
>> Dielectric and o.d. of the coax both affect resonance. I have no data for
>> RG142, but I suggest that you start with the guidelines for RG59/RG8X.
>>
>> 73, Jim K9YC
>>
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