Making my own Circularly Polarized Antenna

[BriansBrain]

Hello all you antenna freaks

The location of my antenna is like this.

My potential listeners in %
To the front 75%
To the rear 22%
To the right 3% (but very close less than 100m, after that its mountains only)
To the left 0% (the sea)

So I am making my own atenna to cover the area
After many design hours I have come up with one
And this is what it will look like

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*NOTE*
All measurements are with a 2m long mounting pole connected to the boom (as pic).

The polar diagram

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The SWR at my chosen frequency comes out at 1.52649
The impedance at my chosen frequency comes out at 196.479
All I need will be a 4:1 balun using RG-213 like this

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Unless I come up with a better one that is (I'm never satisfied)


BB

[BriansBrain]

The Horizontal Plane at my 98.6MHz

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BB

[pcs]

Interesting indeed

[BriansBrain]

Interesting indeed

It cetainly is

But it's a pig to design, the position of the mast in original
design is causing SWR problems, it's very critical

So..... Back to the drawing board

Many hours later I have come up with this beauty

Design. . . . . . . >

All measurements taken as picture (with a beam, fitted to a mast)
Using the 4nec2 Program

Rear Gain 2.29dbi
Front Gain 6.05dbi
SWR 1.02579
Imp 195.791 Ohm

Gain. . . . . . . >

SWR. . . . . . . >

Imp. . . . . . . >

Hor. . . . . . . >

Ver. . . . . . . >

And the best thing is the girlfriend likes it, she says it looks sexy


BB

[BriansBrain]

For some reason only small pics came out this time

Anyone interested here are the full size Pics

Design. . . . . . . > http://postimg.org/image/d45rb3p53/

Gain. . . . . . . > http://postimg.org/image/xyszlkte7/

SWR. . . . . . . > http://postimg.org/image/7t99krvch/

Imp. . . . . . . > http://postimg.org/image/3w9fbg8cz/

Hor. . . . . . . > http://postimg.org/image/kvm0e5ylj/

Ver. . . . . . . > http://postimg.org/image/6peekxwar/


BB