F9FT - 9 elements YAGI Antenna - HAM Radio Antenna

9 elements yagi antenna

Electrical data  
   
Radiation at 144.5 MHz  
Effective electrical length............................ : 1.65 l
Isotropic gain............................................ : 13.1 dBi
Aperture angle @ -3 dB  
- E-plane ...........
: 2 x 20.2°
- H-plane ...........
: 2 x 23°
First side lobe set  
- E-plane ...........
: - 20.5 dB @ 54°
- H-plane ...........
: - 13.6 dB @ 58°
Rear protection......................................... : - 19.8 dB
Average stray radiation  
- E-plane ...........
: - 30 dB
- H-plane ...........
: - 18 dB
Bandwidth  
Gain @ -1 dB........................................... : 140 to 148 MHz
Nominal impedance.................................. : 50 W
Impedance match bandwidth @ SWR<1.3/1 : 143.4 to 146.2 MHz
Acceptable RF power (continous duty)........ : 1000 W
Array of 2 or 4 antennas  
(optimized stacking distance, from center to  
center of elements, for minimal side lobe  
radiation)  
- E-plane - Electrical distance ..
: 1.33 l
- E-plane - Practical distance ...
: 2.77 m
- H-plane - Electrical distance ..
: 1.33 l
- H-plane - Practical distance ...
: 2.77 m
   
Mechanical data  
   
Connector................................................ : N
Overall length............................................ : 3.47 m
Mass....................................................... : 3.0 kg
Effective wind load  
- Horizontal polarisation..
: 0.10 m2
- Vertical polarisation......
: 0.15 m2
Approximate wind load (25m/s - 55 mph)  
- Horizontal polarization..
: 4.1 daN
- Vertical polarization.....
: 6.1 daN
Approximate wind load (45m/s - 100 mph)  
- Horizontal polarization..
: 13.2 daN
- Vertical polarization.....
: 19.7 daN

 
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