Google Translate

×

Message

EU e-Privacy Directive

This website uses cookies to manage authentication, navigation, and other functions. By using our website, you agree that we can place these types of cookies on your device.

View e-Privacy Directive Documents

A 5 element LFA Yagi for 28MHz with a 8.2mtr boom - 5LFA10HZE

Revised August 2010 v1.0

Premium commercial versions of this antenna at Innovantennas

 

I WILL MODEL THIS ANTENNA IN ANY TUBE SIZE OR TAPER SECHDULE FOR YOU, CONTACT ME VIA EMAIL

 

This is a high-gain, wideband LFA (Loop Fed Array) Yagi which covers 28 - 28.5MHz with an SWR of less than1.1:1. It has options with both UK/USA and European sized tube and has a 3 section taper. It was designed for CT1HZE and now available for all to use.

This Antenna has been modelled using NEC4 and confirmed by FEKO. This is thousands of dollars of the very latest antenna design software available and the results are highly accurate. When loading into your software, you will see similar SWR but not the same. Please do not alter the model, build to these dimensions for the best results.

Contact me if you are unsure what correction (if any) you require for the element holders/stand-offs you will use or any other questions you may have.

 

Also read 'An Intro to LFA Yagis' and 'Making the LFA Loop'

 

Antenna Layout and Construction:


 

Performance

10.73dBi @ 28.250MHz

20.26dB @ 28.250MHz

SWR: Below 1.2.1 from 28MHz to 28.500MHz

 

Construction details:

 

Refer to the above drawing.


Antenna Dimensions for UK/USA sized tubing - European version below

Taper: Mid Section, 5/8 inch tube (total length 1.2m). Outer section 1/2 inch 1.1m long. End sections as per below schedule

 

                          Spacing                  End Section Length (All below sizes in Metres)

Reflector                0                              1.026

DE1                         .483                        0.550 - FEEDPOINT

DE2                       1.453                        0.550

D1                         2.492                         0.852

D2                         4.839                         0.766

D3                         8.178                         0.632

Adjust loop width for best SWR upon completion. Fit antenna with a 1:1 balun

 

 

Antenna Dimensions for European sized tubing

Taper: Mid Section, 16mm tube (total length 1.2m). Outer section 13mm tube 1.1m long. End sections as per below schedule

 

                           Spacing                      End Section Length (All below sizes in Metres)

Reflector                0                              1.022

DE1                         .483                        0.547 FEEDPOINT

DE2                      1.453                         0.547

D1                        2.492                         0.848

D2                        4.839                         0.762

D3                        8.178                         0.628

Adjust loop width for best SWR upon completion. Fit antenna with a 1:1 balun

 

Stacking distance: 8m

Gain:                          13.42dBi

F/B:                             20.40dB

 

 

Polar Plots

 

Azimuth Plot of this super antenna

 

 

Elevation plot of this antenna

 

 

A 2 Stack with 8m distance between

 

 

1 x 5el at 15m above ground

 

 

2 x 5el at 15m above ground (15m to bottom antenna)

 

 

SWR Plot

 


Any questions, please ask!

 

Justin G0KSC

 
 
 
 

Google Translate