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Windom baluns for kilowatt range
Windom balun made with Amidon ferrite toroids
post 11 May 2024
Antenna Multibands Links →
Morgain raccorciata per i 40-80 metri, IT9ECY
The antenna described here is known by different names. It is a combination of two dipoles shortened with coils and thus the tires 80-40-20-15 and 10 meters
Multiband HF Center-Loaded Off-Center-Fed Dipol
ON4AA CL-OCFD with 80, 40, 30, 20, 15 10 m coverage. The capacitor C shortens the dipole for 80 m actually 75 m band resonance, whereas the coil lenghtens the dipole for 30 m third harmonic resonance. Resistor R has as sole function bleeding off static charges, protecting capacitor
Folded dipoles
Obviously, the title Folded dipole is not appropriate, it is to confuse the whole with one of its parts
Loop antenna multiband horizontal
This multiband antenna covers the 80, 40, 30, 20, 17, 15, 12, 10 and 6 Mx Amateur bands. Multiband operation is achieved by use of 300 ohm balanced line fed to an antenna tuner
Multibands 3,5 to 28 Mhz
My version of this antenna works from 3.5 to 28 MHz
160
The antenna described here is known by different names. It is a combination of two dipoles shortened with coils and thus the tires 80-40-20-15 and 10 meters
ON4AA CL-OCFD with 80, 40, 30, 20, 15 10 m coverage. The capacitor C shortens the dipole for 80 m actually 75 m band resonance, whereas the coil lenghtens the dipole for 30 m third harmonic resonance. Resistor R has as sole function bleeding off static charges, protecting capacitor
Obviously, the title Folded dipole is not appropriate, it is to confuse the whole with one of its parts
This multiband antenna covers the 80, 40, 30, 20, 17, 15, 12, 10 and 6 Mx Amateur bands. Multiband operation is achieved by use of 300 ohm balanced line fed to an antenna tuner
My version of this antenna works from 3.5 to 28 MHz
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 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 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