9:1 balun for ladder line
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| Dec 13th 2022, 14:28 | |
KC3OCQTotal Topics: 0 Total Posts: 0 |
Hello - I am looking for a diagram for a three wire wrapped ferrite donut to make a balun. I have searched the internet but unfortunately it has only turned up baluns for long wire or end fed dipoles. I am looking for a schematic for a 9:1 as I am feeding my dipole with home made ladder line and then transitioning to coax to enter the shack. Should I ignore that the schematics state long wire or end fed or is there a specific diagram for the interconnection of the windings? Thanks and 73. |
| Dec 13th 2022, 14:32 | |
W1VTSuper Moderator Total Topics: 0 Total Posts: 0 |
9:1s for long wires and end feds are meant to connect unbalanced coax feeders to unbalanced antennas. Connecting them instead to a balanced feeder may unbalance the feeder and result in feedline radiation. If you want to feed a center fed dipole with window line, one of the better combinations is a 130 ft center fed dipole feeding 100 ft of 450 ohm window line going to a 1:1 balun and a short length of coax to an antenna tuner. I have found it difficult to find a combination that will work on all bands. Changing the window line or dipole length will allow the tuner to work on a finicky band but may result in difficult tuning on another band. Zak W1VT ARRL Senior Lab Engineer |
| Dec 14th 2022, 18:26 | |
KC3OCQTotal Topics: 0 Total Posts: 0 |
Thank you Zak. Much appreciated. |
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