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VHF/UHF Wideband Portable Dipole
A dipole has about 3dB gain over a quartre wave antenna, is why my preference went to a simple dipole
post 02 Jul 2024
Antenna for UHF VHF Links →
Logarithmisch-Periodische 2mt und 70cm band
Yagi antenna usually only usable on a narrow frequency band -Monoband. The situation is different with so-called logarithmic periodic directional radiators
Portable 6meter yagi
Boom length of not more that 2M, Reasonable gain,Low cost, Ability to dismantle easily, for transportation
Portable Yagi work on 144MHz
The antenna is matched to the coax using delta arms and a 4:1 coax balun to the dipole. The balun was constructed in the standard way using a loop of about 71cm
QHA Quadrifilar Helix Antenna
Misure per una copertura da 132 a 138 Mhz quindi per i satelliti polari
Reception FM band
The standard T antenna is a pure folded dipole, optimized for the center of the FM band
155
Yagi antenna usually only usable on a narrow frequency band -Monoband. The situation is different with so-called logarithmic periodic directional radiators
Boom length of not more that 2M, Reasonable gain,Low cost, Ability to dismantle easily, for transportation
The antenna is matched to the coax using delta arms and a 4:1 coax balun to the dipole. The balun was constructed in the standard way using a loop of about 71cm
Misure per una copertura da 132 a 138 Mhz quindi per i satelliti polari
The standard T antenna is a pure folded dipole, optimized for the center of the FM band
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