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Antenna HALO Per i 70 MHz
Alimentazione mediante il sistema denominato gamma-match con il condensatore realizzato inserendo il centrale del rg58 completo di isolatore all’interno del tubo di alluminio costituente il gamma-match
post 19 Sep 2024
Antenna for UHF VHF Links →
Quadrifilar helicoidal antenna - Photos
Detailed view of the balun J-J used RG-400, too rigid to bend and pass through the tubing
Quadrifilar Antenna to receive 137 MGHz
Creation of a four-wire antenna to receive the 137 MHz signal from NOAA meteorological satellites
Swiss quad for 144Mhz
This antenna can be made for 50 or 28 MHz. The length of the elements is given at the bottom of the description
The 2 Element HB9CV Beam
The Beam is a coax-fed version of the ZL-Special. The reflector is fed 225 out of phase
The 2m/70cm yagi Project
3 elements on 2 meters and 4 elements on 70 centimeters
155
Detailed view of the balun J-J used RG-400, too rigid to bend and pass through the tubing
Creation of a four-wire antenna to receive the 137 MHz signal from NOAA meteorological satellites
This antenna can be made for 50 or 28 MHz. The length of the elements is given at the bottom of the description
The Beam is a coax-fed version of the ZL-Special. The reflector is fed 225 out of phase
3 elements on 2 meters and 4 elements on 70 centimeters
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
30 Volt Computer Power Supply Stack A bonus was that i discovered that these did not need a standby load connected to the supply to keep them running just apply mains power and close the Start lead to ground