On 2/10/2012 12:48 PM, Eddy Swynar wrote:
>
> On 2012-02-10, at 11:34 AM, Herb Schoenbohm wrote:
>
>> One advantage of using insulate wire is that the velocity factor of
>> the wire
>> on ground or (ROG) allows for shorter lengths. This is important if you
>> have limited yard space.
>
>
>
> */Hi Herb,/*
>
> Interesting point...!
>
> According to either the ARRL "*/ANTENNA HANDBOOK/*", or ON4UN's
> "*/LOW-BAND DX HANDBOOK/*", the velocity factor of insulated wire
> placed atop the ground is *50%*...
>
> I take that to mean that a 1/8-wave /PHYSICALLY/long wire radial has
> the /ELECTRICAL/equivalency of a wire radial that is 1/4-wave long...
>
> Maybe /THAT'S/the reason why I employ a total of 24 insulated radial
> wires, 65' long (each) beneath my "L" elements...it may not be an
> "exact science", but hope springs eternal...! (Besides, have you seen
> the price of copper wire lately...?!). *: >)*
>
> */~73~ de Eddy VE3CUI - VE3XZ/*
Eddy, The insulated rabbit wire ground screen laying on the ground...may
provide a very adequate solution to those with limited space. The price
of this material is very reasonable compared to the area it will
cover...and will most likely last and perform better than bare plain
chicken wire.
Herb Schoenbohm, KV4FZ
_______________________________________________
UR RST IS ... ... ..9 QSB QSB - hw? BK
|