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An introduction to the air cored coil


What are the advantages of an air core coil? its inductance is unaffected by the current it carries
post 30 Jan 2024
An introduction to the air cored coil

Coils Traps Antennas Links

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Le mie sloper per 80/160 Lunghe solo MT. 17,50
Disarming simplicity and an efficiency that is nothing short of incredible

Jar Capacitance Calculator For Coils
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Build an antenna for 40 and 80
With the help of the K7MEM site I learned that the dipole would be about 12 meter long

Bootstrap coax traps for antenna
The article is an analysis of an antenna trap where a coil is formed of a length of coax cable

High-Q Coil Construction Techniques
n the past I used loading coils to improve the efficiency of a short dipole on 80m. The results, however, were disappointing. The main reason seemed to be the low Q factor of the coils


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

A simple SWR Meter is to be used at HF

A simple SWR Meter is to be used at HF An SWR meter provides information about how well matched is your antenna with the transmitter and how well power is being radiated