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Helix Antenna Design
With matching Coax to 50 ohm
post 05 Dec 2024
Antenna Calculator Links →
EZNEC antenna software
EZNEC v. 6.0 programs function on Windows XP(SP3) and later Windows operating systems, 32 or 64 bit
Folded dipole antenna input impedance calculator
If you play with the numbers, and get the input impedance down to 200ohms, you'll need a 4:1 balun to feed it from 50 ohm coax
Folded Dipole Calculator
The impedance of this antenna is around 300 ohm, so you may want to use a transformer or a 1/4 long piece of 120 ohm coaxial cable to match this impedance to 50 ohm
Impedance Transformation with Quarter-Wave Lines
The input impedance of a line an odd multiple of 1/4 long is
Inductive Reactance Calculator
An online inductive reactance calculator: write frequency, inductance
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EZNEC v. 6.0 programs function on Windows XP(SP3) and later Windows operating systems, 32 or 64 bit
If you play with the numbers, and get the input impedance down to 200ohms, you'll need a 4:1 balun to feed it from 50 ohm coax
The impedance of this antenna is around 300 ohm, so you may want to use a transformer or a 1/4 long piece of 120 ohm coaxial cable to match this impedance to 50 ohm
The input impedance of a line an odd multiple of 1/4 long is
An online inductive reactance calculator: write frequency, inductance
Antenna splitter per VHF-UHF per quattro ricevitori Chi dispone di una sola antenna e vuole collegarvi più di un ricevitore necessità di uno splitter
Amateur radio kits by Kanga US
50MHz to 28MHz RX Converter The concept of the rx converter is quite simple and nothing really new. the local oscillator is a standard colpitts crystal oscillator producing the 22mhz lo signal