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Yagi 7 elementi per 70 cm
La lunghezza totale del boom e' di circa 1m. poiche' dietro al riflettore e' previsto il fissaggio al mast. La sezione e' 1 x 2 cm
post 21 May 2023
Antenna for UHF VHF Links →
VHF/UHF Antennas - Using 75 Ohm TV coax instead of 50 Ohm Coax
Some use 75 Ohm coax exclusively and others never use it. Even though high grade 50 Ohm cable can be expensive, and 75 Ohm cable is readily available and cheap
YAGI 3 elements
Example for F = 145 MHz2.07m, spacings = 2.07x0.25 = 51.7 cm, reflector fed 151/F = 1.04m, elements alimentes 143/F= 98.6 cm 2 times 49.3cm, director = 137 / F 0.945mm, or a Boom of 1.05m, impedence = 50 ohms, gain = 7 DBD, RAV-AR = 20 DB
Yagi 9 elements 144mhz
The first director can be moved forward or backward to search for the best ROS
Yagi Uda 10 elementi 144mhz
Il boom e' lungo complessivamente 3 metri e 70 centimetri e puo essere realizzato in tubo di anticorodal o d'ottone
Yagi Ufh 18 element
Boom in aluminum of 2 / 2mm (tv) length 2.80 m,the parasitic elements may be isolated or not indifferently
155
Some use 75 Ohm coax exclusively and others never use it. Even though high grade 50 Ohm cable can be expensive, and 75 Ohm cable is readily available and cheap
Example for F = 145 MHz2.07m, spacings = 2.07x0.25 = 51.7 cm, reflector fed 151/F = 1.04m, elements alimentes 143/F= 98.6 cm 2 times 49.3cm, director = 137 / F 0.945mm, or a Boom of 1.05m, impedence = 50 ohms, gain = 7 DBD, RAV-AR = 20 DB
The first director can be moved forward or backward to search for the best ROS
Il boom e' lungo complessivamente 3 metri e 70 centimetri e puo essere realizzato in tubo di anticorodal o d'ottone
Boom in aluminum of 2 / 2mm (tv) length 2.80 m,the parasitic elements may be isolated or not indifferently
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