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Velocity Factor of Coax
"Howard Kowall" wrote in message
news sorry I should mention the RG-59 is used for impedance matching not feed line thanks again Howard "Howard Kowall" wrote in message ... Hello all What determines the Velocity Factor of a coax cable. Is it the center conductor awg,dielectric,shield or all combined I am building a Lindenblad Antenna for 2 Meters its asked to use RG-59 polyethylene foam coax with stranded center conductor I think the VF is .66 I cant find any stranded center cond where I am,so I want to try it with Solid,but it seems all the solid is VF .88 anyone have any input on this thanx howard It's principally the relative permittivity of the dielectric that determines the velocity factor. Air alone would yield a value of unity but the presence of a spacer of some sort means practical values are smaller. Foam can get close to air. I wonder why you need a Lindenblad for 2 metres - do you really need good circular polarisation over a range of elevation angles (and omni HRP, of course)? Chris |
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