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Antenna Halo con Gamma Match 144 Mhz


Si tratta di un dipolo a 1/2 richiuso a forma di cerchio,con gli estremi distanziati fra loro,e alimentato tramite Gamma Match
post 18 Dec 2021


Antenna for UHF VHF Links

160



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

10 m| 12 m| 15 m|
17 m 20 m| 2 m|
23 cm| 30 m| 40 m
6 m| 70 cm| 60 m| 80 m| 160 m| 136 khz
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