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Balun trasfomazione multipla
Con un rapporto 4:1 portiamo ad 1/4 l'impedenza che presenta l'antenna, con un rapporto 9:1 ad 1/9 e con un rapporto 16:1 ad 1/16. Alcuni esempi di elevati valori d'impedenze che potrebbe presentare un'antenna, adattate tramite balun
post 20 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
200
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
PIC-Keyer This project describes the construction of a real "QRP" keyer with a small microcontroller PIC 16F84, with slightly modified hardware also PIC16F62
Radioassistance Radioassistance E Kenwood Dealer, vendita ricetrasmittenti, antenne, parti di ricambio, elettronica
Conrad Electronic Electronic components online shop in German and Italian