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Balun of 4:1 Ruthroff
These notes primarily relate to the construction of 4:1 Unbalanced to Unbalanced, Ruthroff voltage transformers UnUn, where one end of the windings are connected to ground
post 12 Oct 2024
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
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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
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