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Antenna Build a 2m 8db collinear
I started to build the antenna by cutting four lengths of wire, the measurement is 38.75ins for a half wave @ 145mhz but I cut them at 39.75ins to compensate for the joints
post 03 Jun 2024
Antenna for UHF VHF Links →
The VHF Quagi
The Quagi requires neither fine tuning nor careful handling. Many of these antennas have survived several years
Una Yagi da nove elementi portatile per i 144
Il boom e' realizzato con l'unione di tre profilati di alluminio di sezione quadrata da 20 mm e da 1 mm di spessore
2 Meter antenna cycloid dipole
The 6 and 2 meter cycloid dipoles, note the rain shield covering the rear portion of the matching sections along with the 1/2 wave coaxial cable delay line comprising the 200 ohm balun on each antenna
Yagi LFA 9 elementi per i 2 metri
Yagi lfa loop fed array per i 2m, con boom da 4.6m. l'antenna e' composta da elementi direttori e riflettori come le normali yagi
Matching transformers for 3 stacked yagi
Using three antennas often provides a good compromise between increased antenna gain
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The Quagi requires neither fine tuning nor careful handling. Many of these antennas have survived several years
Il boom e' realizzato con l'unione di tre profilati di alluminio di sezione quadrata da 20 mm e da 1 mm di spessore
The 6 and 2 meter cycloid dipoles, note the rain shield covering the rear portion of the matching sections along with the 1/2 wave coaxial cable delay line comprising the 200 ohm balun on each antenna
Yagi lfa loop fed array per i 2m, con boom da 4.6m. l'antenna e' composta da elementi direttori e riflettori come le normali yagi
Using three antennas often provides a good compromise between increased antenna gain
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