Probably the feed coefficient of the coaxial cable helps in matching the 
antenna impedence to the rig.  But, I would think that even with a velocity 
factor of .66, there would be other points of resonance along that feedline 
other than 250 feet.

Steve, K8SP
----- Original Message ----- 
From: "Jim Shaffer" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Saturday, January 25, 2014 9:39 AM
Subject: Just purchased a Zerofive vertical


> Well I just bought a 29 ft. Zerofive vertical for 6 =E2=80=93 80 meters. =
> That fits our HOA regulations.  Now I need to get some coax.  The web =
> page on the antenna says I should have a minimum of 100 feet of coax.  =
> After some email exchanges with Tom, it appears that with at least 100 =
> feet of coax, I=E2=80=99ll be able to tune it with my internal tuner in =
> the ts-590, but with less than 100 feet I=E2=80=99ll need to use an =
> external tuner.  He says that my MFJ tuner should tune the antenna with =
> 75 feet of coax.  I=E2=80=99m not familiar with any coax length limits.  =
> Can anyone explain why it=E2=80=99s necessary to have a long coax run to =
> this antenna?  Also, I=E2=80=99m wondering what I should do with the =
> excess coax?  Should I coil it some where, or just sort of spread it =
> out?
>
> Now it=E2=80=99s been years since I bought any coax.  The last time I =
> did I got some 9913 50 ohm coax that had tinfoil shielding between the =
> brade and center conductor to protect the insulation from UV.  =
> I=E2=80=99d welcome thoughts on recommended coax for 6 =E2=80=93 80 =
> meters.
> --
> Jim Shaffer, KE5AL
> Pflugerville, TX
> www.jjshaffer.net
> www.pgramblers.com