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Coax cables specifications

A Quarter wavelength of RG-58/U (VF = 0.66) at 7.040Mhz would be 23.06ft in length
post 07 Nov 2020

Antenna Feed Lines Links


All-HF-Band, Horizontal, Center-Fed Antenna, W5DXP
All-HF-Band, Horizontal, Center-Fed Antenna is our old friend, the 80 meter halfwave dipole dressed up a bit. By varying the length of the 450 ohm ladder-line feeding the antenna, we can achieve an SWR of less than 2:1 on all frequencies on all HF bands with the exception of the lowest part of 80m

Antenna Cable Loss and SWR,YO5OFH
To measure the cable loss, you should disconnect the other end of the cable from the antenna

Balanced feed with coaxial line
A previous model, fed with 300-ohm Twin-Lead and a T-match, had just beentaken down due to the unsatisfactory performance

Parallel Wire Impedance Calculator
This tool is designed to calculate the inductance of two parallel wires

Coaxial line RF choke
Understanding Common Mode and Differential Mode Currents on Transmission Lines