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BriansBrain
New registered user


Joined: 06 Mar 2013 Posts: 6 Location: Gran Canaria, Spain.

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Making my own Circularly Polarized Antenna |
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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 
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Mon Mar 18, 2013 1:25 pm |
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BriansBrain
New registered user


Joined: 06 Mar 2013 Posts: 6 Location: Gran Canaria, Spain.

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The Horizontal Plane at my 98.6MHz
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BB 
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Tue Mar 19, 2013 12:58 pm |
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pcs
Site master


Joined: 18 Jan 2002 Posts: 3099 Location: Radio Land |
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Interesting indeed 
_________________ Best regards,
Marko - PCS Electronics
--------------------------------------------------------
Turn your PC into a FM radio station!
http://www.pcs-electronics.com
fax +386 4 2316 128 |
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Tue Mar 19, 2013 7:27 pm |
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BriansBrain
New registered user


Joined: 06 Mar 2013 Posts: 6 Location: Gran Canaria, Spain.

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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 
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Fri Mar 22, 2013 7:51 pm |
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BriansBrain
New registered user


Joined: 06 Mar 2013 Posts: 6 Location: Gran Canaria, Spain.

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Fri Mar 22, 2013 8:23 pm |
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