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Re: [TowerTalk] Need help estimating cable length of DXE 400 MAX

To: towertalk@contesting.com
Subject: Re: [TowerTalk] Need help estimating cable length of DXE 400 MAX
From: Don <w7wll@arrl.net>
Reply-to: w7wll@arrl.net
Date: Sun, 12 Jan 2020 10:31:45 -0800
List-post: <mailto:towertalk@contesting.com>
I'd appreciate your sharing that with those of us casual users with antenna analyzers but who profess to be novices in their use. Have used it for some of the applications but still a learner. Mine happens to be a 269C and I find the instructions to be somewhat lacking.

Don W7WLL

On 1/12/2020 10:24 AM, David Gilbert wrote:

If you have an antenna analyzer that can measure complex impedance (as in R +/- jX) and if you are willing to put a connector on one end of the cable, I can tell you how to get an accurate length measurement using TLW, the transmission line application that comes free with the ARRL Antenna Book.  You don't need an instrument with TDR capability (Time Delay Reflectometer) to do it.

73,
Dave   AB7E



On 1/12/2020 3:44 AM, Phil wrote:
I am involved in selling items to benefit the estate of a SK.
One of the items is a unused roll of 400MAX cable that is still
in the plastic cling wrap it was shipped in.  I know there is
at least 100 feet of cable there but I think there is possibly
50 or even 100 feet more.  I don't want to unroll the cable to
measure it and get it all kinked or dirty.  The roll weighs
17 pounds.  I've checked the DXE web site but can't find anything
that gives the weight per foot.  The roll is approximately 8 inches
inside diameter, 16 inches outside diameter, and contains 55 to 60
turns.  The packing label on the roll says DXE400MAXDCU200.
Can anyone help me with a good estimate of the length?

thanks, 73, Phil   W5BVB

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