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Baluns
At HF and even at VHF, broadband baluns are generally used nowadays. These can be divided into two distinct categories: voltage baluns and choke or current baluns
post 19 Sep 2023
Toroid & balun Links →
50ohm to 200ohm
Balanced and unbalanced systems can produce common mode currents that cause equalizing currents at the interface of both systems. And exactly at this interface baluns are switched
9:1 UnUn Project
known as a Magnetic Longwire Balun, it is an impedance transformer whose purpose is to feed a high impedance long wire from a 50ohm unbalanced coaxial input. With a 9:1 turns ratio, this gives 450ohm output impedance for the long wire
A cheap easy 1:1 balun
My Baluns are working well on both my 40M resonant dipole and my G5RV antennas
A Cost Effective Current-Mode 1:4 Balun
A cost effective current-mode 1:4 balun can be constructed from two lengths of coax, two ferrite rods, some electrical tape, cable ties, a length of PVC water-pipe and some connectors
209
Balanced and unbalanced systems can produce common mode currents that cause equalizing currents at the interface of both systems. And exactly at this interface baluns are switched
known as a Magnetic Longwire Balun, it is an impedance transformer whose purpose is to feed a high impedance long wire from a 50ohm unbalanced coaxial input. With a 9:1 turns ratio, this gives 450ohm output impedance for the long wire
My Baluns are working well on both my 40M resonant dipole and my G5RV antennas
A cost effective current-mode 1:4 balun can be constructed from two lengths of coax, two ferrite rods, some electrical tape, cable ties, a length of PVC water-pipe and some connectors
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