Topband: inverted L favored direction

[py2yp at py2yp.ws]

Hi Earl,

Many thanks for clarifying this issue. I'm about to erect an inverted L this 
weekend following the W1BB guidances (tnx PY2FUS). The vertical portion will 
be 59 feet and the horizontal will be 111 fet, it means 170 feet overall 
size. The soil conductivity is nearly 15 mS/m which means average soil if 
memory doesn't fail.

In this situation, how will it perform? I mean max radiation angle and Z 
point?

Regards,

73 DX de PY2YP - Cesar
www.py2yp.ws
----- Original Message ----- 
From: "Earl W Cunningham" <k6se at juno.com>
To: <bohnovic at bellsouth.net>; <epetek1 at att.net>; <topband at contesting.com>
Sent: Tuesday, September 21, 2004 11:09 AM
Subject: Re: Topband: inverted L favored direction


| John, K4WJ wrote:
|
| "Does this mean that if I have an inverted L in my back yard with the
| vertical portion of the antenna on the southern edge of my lot and the
| horizontal section running due north that the favored direction of the
| antenna will be to the south?"
| ==========
| Yes, it does.
|
| The longer the horizontal portion is, the greater the "F/B" will be.  For
| example, an inverted L that is 50% vertical and 50% horizontal has a F/B
| of about 0.9 dB, but one with 25% vertical and 75% horizontal has a F/B
| of about 2.5 dB.
|
| Of course, as the horizontal portion gets longer, the angle of max
| radiation becomes higher and the feedpoint impedance becomes lower
|
| The 50/50 inverted L has max radiation at about 27 degrees above the
| horizon over average soil and a feedpoint Z of about 22 ohms at
| resonance, while the 25/75 inverted L has max radiation at about 35
| degrees and a feepoint Z of about 9 ohms.
|
| 73, de Earl, K6SE
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