[Antennas] " G5RV " TYPE ANTENNA / "CUSHCRAFT MA5V"ANTENNA QUESTIONS

[Mark]

Hmmm . this "twist" stuff is interesting!  Back when .. circa 1967 +/-  .. I
installed UHF antennas in the Clear Lake, CA region.  The reason the "twist"
was incorporated was because that hopefully kept the twin lead foam
insulated twin lead from oscillating/pulsing towards the antenna mast when
there was a wind.....   worked pretty good .. the reason for the UHF was the
TV translators on Mt. Knocti  --- and, worked fine .. without the "twist"
the "ladder line" would slap the pole, and those people trying to watch
Lawrence Welk would get way grouchy.  73 .. Mark  6dx
----- Original Message -----
From: "Cletus W Whitaker" <whitaker@pa.net>
To: "K6MHE" <k6mhe@arrl.net>
Cc: <antennas@mailman.qth.net>
Sent: Sunday, June 30, 2002 6:53 PM
Subject: Re: [Antennas] " G5RV " TYPE ANTENNA / "CUSHCRAFT MA5V"ANTENNA
QUESTIONS


> de WB2CPN South Central Pennsylvania    2002.06.30
>
> A slow twist in the ladder line will tend to equalize the effects of
> external influence, but the effect such influence has on the ladder line
> will depend on a few factors; do the two wires of the ladder line get
> equal treatment from the metal or whatever, how much of the ladder line's
> length is near metal, where in the scheme of things from one end of the
> ladder line to the other (parts of a wavelength)is the metal?  Etc.  And
> most important, is the ladder line part of a resonant system or is it
> a flat 400 Ohm line.  If it's a resonant system it will tolerate a lot
> of weird routing if the system can still be tuned properly.  Ogden Nash
> put it nicely, "With mules there are no rules." Same thing with ladder
line.
>                      73   Clete
> - - -
>