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Antenna HALO
Halos are customarily operated with the plane of the loop oriented horizontally, parallel to the ground, whereas small-loop antennas often are oriented vertically
post 19 Sep 2024
Antenna for UHF VHF Links →
VHF-UHF Yagi Antenna Feed Design
Balanced feed line are readily available in various impedances 75/300/450 ohms, but the use of a balanced feedline presents some physical requirements that are not easy to get around
Yagi 7 el. Per 70 cm. Ecologica
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
Yagi 9 elements
The first director can be moved forward or backward to search for the best ROS
6-Element yagi for 144 MHz
The design has been performed using yagimax2 software and practical tests. I created several prototypes before I found out the correct measurement
7 Elements Yagi for 146Mhz
7 Elements yagi configured in vertical 2 stacked antenna tuning
155
Balanced feed line are readily available in various impedances 75/300/450 ohms, but the use of a balanced feedline presents some physical requirements that are not easy to get around
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
The first director can be moved forward or backward to search for the best ROS
The design has been performed using yagimax2 software and practical tests. I created several prototypes before I found out the correct measurement
7 Elements yagi configured in vertical 2 stacked antenna tuning
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