Topband: 5/8 wavelength vertical is mo betta than shorter versions??

[Peter Voelpel]

Hi Niko,

Concerning your real experience, how did you measure the elevation angles
and pattern beam width?

73
Peter

-----Original Message-----
From: Topband [mailto:topband-bounces at contesting.com] On Behalf Of Niko
Cimbur
Sent: Samstag, 28. September 2013 19:46
To: topband at contesting.com
Subject: Topband: 5/8 wavelength vertical is mo betta than shorter
versions??

>>??? ______________ >Note that for 1 kW of applied power, the maximum
inverse distance field 1 
>mile from a 5/8-wave vertical is 275 mV/m compared to 195 mV/m from a 
>1/4-wave vertical. >The difference is 20log(275/195) = 2.99 dB, which
supports the point of my 
>post.
Sure, over perfect ground the 5/8 wl has 3db more gain at 0 degrees
elevation.. 

You are talking about theoretical gain.  I am talking about real world
experience.

Even if you have access to a location surrounded by Saltwater (like me) the
max gain of a real 5/8 wl vertical over 1/4 wl is going to be about 2.2
dB,and the elevation angle 5 degrees, the vertical beamwidth 17 degrees.
Over Average ground - which was where we set up the two verticals in the
first place,
the gain of a 5/8 wl is some 2dB less than the 1/4 wl vertical, the main
lobe at 15 deg, and the BW 23 deg.
The 1/4 wl main lobe is at 26 deg with BW 42 deg!
After having said that if I only could put up one antenna I would choose an
Inverted L over salt water (again).
Niko AC6DD 
_________________
Topband Reflector