- Antenna 1 5 Element horizontal YAGI Beam -




- Technical data -

Forward GAIN   : 10.54 dBi
F / B RATIO    : 34.80 dB
Arrey Lenght   : 6.50 m

Operating Frequency : 27.500 MHz (Center)

Element Lenght
===============
Reflector Lenght    : 5.540 m
Fed Element Lenght  : 5.264 m
Director 1 Lenght   : 5.073 m
Director 2 Lenght   : 5.058 m
Director 3 Lenght   : 4.891 m

Spacing
===============
Spacing R  -> F      : 0.950 m
Spacing F  -> D1     : 1.160 m
Spacing D1 -> D2     : 1.876 m
Spacing D2 -> D3     : 2.530 m

Element Diameter & Taper Schedule
===============
Section      Center   Mid     End 
Diameter     20mm     15mm    10mm
½ Refl       99cm     90cm    97.8cm
½ FedE       99cm     90cm    83.3cm
½ Dir1       99cm     90cm    73.1cm
½ Dir2       99cm     90cm    72.4cm
½ Dir3       99cm     90cm    63.5cm

- Calculating -
The antenna is calculated and 'simulated' using the computer software 'Quick YAGI'
Here is a 'screenshot' of the simulated antenna 'foot-print' with calculated gain and f/b ratio.



- Feed system -
On the antenna drive element i use the 'Gamma Match' drive system described In the 'Antenna Load&Feed HOW-TO'

- Images -

Gamma Match Feed system.

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©1999/2000/2001/2002 SM2YER Goran