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Build an antenna for 40 and 80
The solution build an antenna for 40 and 80. The roof on the building is not that big that I could install a full size dipole or inverted V
post 20 Apr 2024
Coils Traps Antennas Links →
An Attic Coaxial-Cable Trap Dipole for 10, 15, 20, 30, 40, and 80 Meters
A coaxial-cable trap dipole antenna installed in the attic provides a surprisingly effective solution to HF
Simple Building and Tuning of Traps
Traps are useful for multiband operating of all kinds of antennas
40 & 80 meter trap dipole
Coil 78 turn of insulated copper Wire no spaced
Coaxial Traps Grid-dip meter method
A trap is a parallel resonant circuit network that can perform either of two functions in an antenna system
Coil Design
The coil design is one of the most difficult and important parts of the coilgun
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A coaxial-cable trap dipole antenna installed in the attic provides a surprisingly effective solution to HF
Traps are useful for multiband operating of all kinds of antennas
Coil 78 turn of insulated copper Wire no spaced
A trap is a parallel resonant circuit network that can perform either of two functions in an antenna system
The coil design is one of the most difficult and important parts of the coilgun
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