[TowerTalk] Matched "Bury Flex" cables

Al Toothaker N6TA at arrl.net
Thu Jul 14 00:36:29 EDT 2005


Wouldn't the different electrical lengths indicate that the cable
manufacturing process is not consistent?  Any spec on a cable has a
tolerance and though they may wander in performance, it could still meet
their specs.
Al
N6TA

> -----Original Message-----
> From: towertalk-bounces at contesting.com [mailto:towertalk-
> bounces at contesting.com] On Behalf Of R.Sigismonti
> Sent: Wednesday, July 13, 2005 8:28 PM
> To: <towertalk at contesting.com> <towertalk at contesting.com>
> Subject: [TowerTalk] Matched "Bury Flex" cables
> 
> I recently purchased a 1000 ft roll of Davis BuryFlex cable, planning
> on using it to replace old RG-213 cables on my 15M and 20M 3-stacks.  I
> pruned one length of cable for an odd multiple of quarter waves at
> 21150 kHz and then proceeded to cut two others to the exact length of
> the first cable.  Much to my surprise, when I checked the electrical
> length of the other two cables, I found them resonant well below the
> 15M band.  I had to remove 4-5 feet of cable from each run (approx
> 142ft) to get them to resonate.  Has anyone run into a similar
> experience, where the apparent velocity factor of the cable varied in a
> single run?  I haven't checked the 20M lines, which I made in a similar
> fashion, but hope to be lucky with them.
> 
> Sig
> 
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