PCS Electronics PCS Electronics - home page PCS Electronics  
RegisterSearchFAQAM & FM Radio transmitters shop UsergroupsLog in
Making my own Circularly Polarized Antenna

 
Reply to topic    PCS-Electronics Forum Index » Antennas View previous topic
View next topic
Making my own Circularly Polarized Antenna
Author Message
BriansBrain
New registered user
New registered user


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

Post Making my own Circularly Polarized Antenna Reply with quote
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

. . . . . . . >


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

The polar diagram

. . . . . . . >

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

. . . . . . . >

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


BB
Mon Mar 18, 2013 1:25 pm View user's profile Send private message
BriansBrain
New registered user
New registered user


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

Post Reply with quote
The Horizontal Plane at my 98.6MHz

. . . . . . . . . >

BB
Tue Mar 19, 2013 12:58 pm View user's profile Send private message
pcs
Site master
Site master


Joined: 18 Jan 2002
Posts: 3063
Location: Radio Land

Post Reply with quote
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
Tue Mar 19, 2013 7:27 pm View user's profile Send private message Visit poster's website
BriansBrain
New registered user
New registered user


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

Post Reply with quote
pcs wrote:
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
Fri Mar 22, 2013 7:51 pm View user's profile Send private message
BriansBrain
New registered user
New registered user


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

Post Reply with quote
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
Fri Mar 22, 2013 8:23 pm View user's profile Send private message
Display posts from previous:    
Reply to topic    PCS-Electronics Forum Index » Antennas All times are GMT + 1 Hour
Page 1 of 1

 
Jump to: 
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum


Powered by phpBB © 2001, 2005 phpBB Group