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VHF/UHF Dualband vertical
I used this antenna aluminum 0f 10mm diameter, or yoy use a brass rod of about 7 mm diameter. the top one is a strong copper bras wire of 5 to 7 mm diameter
post 09 May 2024
Antenna for UHF VHF Links →
Lindenblad Antenna for 137MHz
I have built my last couple of Lindenblads from lengths of 4mm-diameter galvanised steel fencing wire, some standard 300-ohm television ribbon cable
Quad 2 elementi 144 Mhz
Realizzare il boom tagliando il listello di legno più grosso per una lunghezza di circa 23 cm,quindi fissare gli angolari due per lato contrapposti con le viti per legno
Quadrifilaire 137 Mhz for satellite
I found that an excellent antenna for picking up these signals are Quadrifilar Helix Antennas 137 MHz
Quadra Cubica de 4 Elementos para VHF
155
I have built my last couple of Lindenblads from lengths of 4mm-diameter galvanised steel fencing wire, some standard 300-ohm television ribbon cable
Realizzare il boom tagliando il listello di legno più grosso per una lunghezza di circa 23 cm,quindi fissare gli angolari due per lato contrapposti con le viti per legno
I found that an excellent antenna for picking up these signals are Quadrifilar Helix Antennas 137 MHz
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