Heres a quick rule of thumb as far as cable bend radius.
The Electronic Industries Association / Telecommunications Industries Association specify that the worst-case cable radius of any cable that is compliant, is 20x the outer jacket diameter for any cable under pulling strain. This is used for selecting a pulley sheave for pulling cables around corners. A cable under no strain can be radiused at 10x its outer jacket diameter. So your ½ heliax should not be bent tighter than a 5 RADIUS. Thats a 10 diameter circle. Ive seen it bent quite a bit tighter. The danger (besides kinking) is a change of impedance. Its visible on a TDR. We use this rule at work for fiber-optic cables. Only a very few specific cables seem to allow a tighter bend radius. 73 de N1FNE _____ From: [email protected] [mailto:[EMAIL PROTECTED] On Behalf Of skipp025 Sent: Thursday, December 28, 2006 11:31 PM To: [email protected] Subject: [Repeater-Builder] Re: LMR-400 Cluster $*%& Again [Only Robin caught the "cluster" mistake... hummm...] Hi Scott, If you saw a previous post... I mention the soft flexible coax line foam vs the more firm or hard foam found in rigid coax... aka hardline. There are bend radius specs given for most good/higher end flex and rigid coaxial cables. Just a web page search away depending on the brand and model number. cheers, > "Scott Overstreet" <[EMAIL PROTECTED]> wrote: > Hello All > How about 1/4 inch Andrew Superflex hardline for fixed jumper service in a repeater system? > This cable has a foam dielectric-----is there a center conductor > migration problem and if so at less than what bend radius? > Many thanks--- > Scott, N6NXI >
