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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 15 Feb 2024
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
23cm Yagi Antenna building Finished antenna at 1275 MHz SWR under 1:1.5 at resonant frequency
50 MHz preamp Gain 26dB with the BFG135 Preamps for 144 and 430 MHz, for 50 MHz, the BFG135a is a cheap transistor and in my view rather strong. It is not easily damaged by static discharge or RF power. FG connection
Interface-for-digital-broadcasts-with-integrated-audio 4-port HUB, with a TUSB2046. With port 1 of the HUB we drive the FT232RL; with port 2 the PCM2904, furthermore, we decided to leave ports 3 and 4 free