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Antenna problems
The advantages of a vertical are that they take up little space and that the beam angle is very low
post 10 May 2024
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Multiband trap dipole antenna
Coaxial traps work as loading coils below their resonant frequency, thus reducing the overall length of the dipole
Trapped dipole antennas
Looking at the sketch above, when working 40 m only the red wires are part of the antenna but when using 80 m the red and purple wires are the antenna
Trappola per dipolo 40/80m
Sono stati realizzati due circuiti risonanti di facile riproducibilità e meccanicamente di adeguata robustezza
The W3DZZ antenna for 40 and 80 meter band
Before you start, bee sure that you know exactly where you would hang the dipol
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Coaxial traps work as loading coils below their resonant frequency, thus reducing the overall length of the dipole
Looking at the sketch above, when working 40 m only the red wires are part of the antenna but when using 80 m the red and purple wires are the antenna
Sono stati realizzati due circuiti risonanti di facile riproducibilità e meccanicamente di adeguata robustezza
Before you start, bee sure that you know exactly where you would hang the dipol
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