[Elecraft] OT: G5RV antenna

[Rose]

Don is of course correct in his reference to the antenna actually being an
"extended double zepp" using the dimensions in my example.

73 !

K0PP



On Sat, Dec 8, 2018, 15:15 Don Wilhelm <donwilh at embarqmail.com wrote:

> Ken and all,
>
> More correctly if the terminology of hams is to be deemed correct, it is
> a "Double Extended Zepp".  The radiator each side of center is 5/8
> wavelength long (at 20 meters).  The 32' 300 ohm ladder line is for
> impedance transformation.  It does provide some broadside gain on 20
> meters.
>
> I hesitate to call anything other than the original Zepp antenna (so
> named because it was towed behind Zeppelin airships) a "Zepp", but hams
> have known to construe antenna names before.
>
> The original Zepp antenna is a half wave antenna fed with a 1/4 wave
> parallel feedline.  Turn it vertically and what do you have but what is
> commonly called the J-pole in VHF circles.
>
> Who said there is new antenna technology?  Much is just renamed antennas
> that have been around for 50 to 80 years in one form or another.
> Various methods of radiator to feedline matching may be newer stuff, but
> the behavior of radiators has been relatively unchanged over a long
> period of time.
>
> 73,
> Don W3FPR
>
> On 12/8/2018 11:32 AM, Ken G Kopp wrote:
> > As I've already stated … I have a copy of the original Varney
> > RSGB article that describes the G5RV and plainly states that
> > it's a 20M only antenna.
> >
> > Remember, it requires an antenna tuner …
> >
> > Start with a dipole …
> >
> > Keep the "magic" 32' length of 300 ohm feedline.
> >
> > Delete the 68' of coax.
> >
> > What's left?  A "normal" open wire fed dipole, better
> > known as a Zepp.
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