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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 operation on the 10, 15, 20, 30, 40, and 80 meter
post 09 Apr 2024
An Attic Coaxial-Cable Trap Dipole for 10, 15, 20, 30, 40, and 80 Meters

Coils Traps Antennas Links

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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, depending on whether the traps are resonant at the operating frequency

Coil Design
The coil design is one of the most difficult and important parts of the coilgun

Cool It
I have owned an AT-AUTO since they were first released and its given good service. One area that it let me down was 10M

Current Through a 75m Bugcatcher Loading Coil
Many experiments and measurements have been made on loading coils using net standing wave current


Linear-loaded-short-dipole-21mhz

Linear loaded short dipole 21Mhz For my amateur radio activities on the HF bands I only have a 3.6 m wide balcony available for antennas. After some study I decided to experiment with a shortened dipole for the 15 m band

Rx antennas 4Square Rx Vertical Array

Rx antennas 4Square Rx Vertical Array My frequency design of 1.825 MHz a 90 degrees line would be 33,70 metersinstead of the previously calculated 33,27 m

Atu balanced feeder antenna system

Atu balanced feeder antenna system An ATU has the advantage of bringing the feeder-antenna system to resonance, act as a band pass filter both on receive and transmit and a low SWR