[TowerTalk] Cell Flex Cable Question

[Steve Davis | Davis RF]

Al, thank you for your feedback.  I stand corrected. But RFS did, in fact, spec " annular" corrugated copper shield up until approx  2009. Now it is referred to as "corrugated copper".

The point I intended to make to Bob is that it is
often referred to as "hard line" (to clarify his reference to HL) and that the outer shield is corrugated. And, not as flexible as the Cellflex Tm name might emulate.

Regards, Steve  K1PEK,  DAVIS RF Co., Snr. Cable Design Engr/Founder,   DAVIS RF Co.

________________________________
From: Al N6TA <al.n6ta at gmail.com>
Sent: Saturday, September 14, 2019 11:14 PM
To: Steve Davis | Davis RF <sdavis at davisrf.com>
Cc: towertalk at contesting.com <towertalk at contesting.com>; Robert Harmon <k6uj at pacbell.net>
Subject: Re: [TowerTalk] Cell Flex Cable Question

A minor detail: Heliax does not use annular corrugation.  A long time ago, KabelMetal/RFS owned Phelps Dodge which came to be called Cablewave.   Cablewave needed to make a line of coax to compete with Heliax but it had to be annular and not helical.  They have been playing catch up ever since on coax as well as elliptical waveguide.  And parabolic dishes.  Cablewave makes fine product and is just as worthy as the bigger name brand.  They make foam dielectric and larger types of mainly air dielectric for those that need the lowest of loss and have the money for it.  They also do rigid coax that measure in the inches with EIT connectors.  I doubt the connectors are interchangeable with those for Heliax.
Al
N6TA

On Sat, Sep 14, 2019 at 9:28 AM Steve Davis | Davis RF <sdavis at davisrf.com<mailto:sdavis at davisrf.com>> wrote:


________________________________
 Bob,  1/2" RFS Cellflex Tm is not as flexible as the name might imply.  It is not good for rotor loops unless you use a loop that is far longer than what length you would use for say a LMR-400 UF or Belden 9913F7 (their Belden being preferable for a number of reasons)

1/2" RFS Cable Wave Systems
Cellflex Tm   IS, in fact, hardline.  It uses an annularly corrugated  outer copper shield, same as Heliax.

At 20 M.  the attenuation is low for many cable choices.  Also,  if you chose Cellflex, you would want to use a rotor loop of 9913F7, etc.  Splicing that in with two connectors and a barrel adaptor, CONTRARY to popular belief, is going to create such a low insertion loss, that there will never be any perceptible negative factor to any receive or transmitted signal.  I'm talking less than .002 dB (at the MUF of the connector, 300 MHz is the MUF for our UHF connectors)  using our commercial connectors.

As I stated in the email to you this a.m, which crossed in the mail with your posting here today, I will get back to you with facts, details, alternatives and lower costs than 1/2" RFS
   73  Steve   K1PEK,  Snr. Cable Design Engr/Founder,   DAVIS RF Co.


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Message: 8
Date: Sat, 14 Sep 2019 08:47:52 -0700
From: Robert Harmon <k6uj at pacbell.net<mailto:k6uj at pacbell.net>>
To: towertalk at contesting.com<mailto:towertalk at contesting.com>
Subject: [TowerTalk] Cell Flex cable question
Message-ID: <5C2910DF-EAD9-4F29-8E2C-492CE3ADAD90 at pacbell.net<mailto:5C2910DF-EAD9-4F29-8E2C-492CE3ADAD90 at pacbell.net>>
Content-Type: text/plain;       charset=us-ascii


Have you used Cell Flex cable from Davis RF ?  Looking for feedback on this cable.  I am thinking
about replacing a 300 foot run of RG-213 from my shack to a 20M yagi with 1/2" Cell Flex.  .  It looks like it would
give me approximately 1.8 db  less loss for a 300 foot run if I figured it out correctly. Much cheaper than hardline.
I am wondering if it is flexible enough to used in a rotator loop so I wouldn't need to use a section of more flexible
cable for the loop ?

Bob
K6UJ


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