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Vertical Collinear for VHF and UHF
An omnidirectional collinear, is capable of surviving harsh environments. It's a good choice for repeater installations and can be top, or side mounted to the tower
post 29 Jan 2024
Antenna for UHF VHF Links →
Loop per i 144 mhz
L'antenna si compone di un normale connettore da pannello, saldato al cerchietto di rame argentato ai cui estremi andra' saldato un compensatore Philips
Magnetic Loop for the 2m band
This loop copper is made of 50cm of 4mm soft tubing. The capacitor of two 1mm circular plates with about 3cm diameter torch-brazed to the loop conductor
PMR 446 by Sigmund
Questo tipo d'antenna e' mutuato direttamante da una Yagi col vantaggio del minore ingombro e della maggiore robustezza meccanica
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L'antenna si compone di un normale connettore da pannello, saldato al cerchietto di rame argentato ai cui estremi andra' saldato un compensatore Philips
This loop copper is made of 50cm of 4mm soft tubing. The capacitor of two 1mm circular plates with about 3cm diameter torch-brazed to the loop conductor
Questo tipo d'antenna e' mutuato direttamante da una Yagi col vantaggio del minore ingombro e della maggiore robustezza meccanica
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