TONNA 20818 2m 144 - 146MHz 2x9 Crossed Yagi
[220818]

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 23.0°
First side lobe set  
- E-plane  : - 20.5 dB @ 54°
- H-plane  : - 13.6 dB @ 58°
Rear protection  : - 19 dB
Average stray radiation  
- E-plane  : - 35 dB
- H-plane  : - 24 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
Required phase delay between frontmost  
and rearmost driven element  : 72°
Array of 2 or 4 antennas  
(optimized stacking distance, from center to  
center of elements, for minimal side lobe  
radiation)  
Electrical distance  : 1.33 l
Practical distance  : 2.77 m
   
Mechanical data  
   
Connector  : N
Overall length  : 3.57 m
Mass : 3.3 kg
Effective wind load : 0.15 m2
Approximate wind load (25m/s - 55 mph)  : 5.6 daN
Approximate wind load (45m/s - 100 mph)  : 18.2 daN