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A jpole dipole 1/2 wave for 4 meter


J-pole, centre fed dipole. I built it using two 1 metre lengths of 6mm aluminium tube, and all terminations are inside a waterproof electrical box. Inside, I also placed a coax choke balun, which is built out of a 25mm piece of pipe, with 11 turns of RG58 coax wrapped around it
post 16 Dec 2021
A jpole dipole 1/2 wave for 4 meter


Toroid & balun Links

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1:4 Guanella-Balun Current-Balun
The purpose of this article is to show how a 1:4 Guanella current balun changes an impedance level by a multiplier of four; for example, 50-ohm coax to a 200-ohm antenna

Constructing a 6:1 RF transformer
If it's using used a 50 Ohm coaxial transmission line, the main problem in constructing a 1:1 current balun using bifilar windings is that you have to get the impedance of the transmission line formed by the two parallel wires exactly correct

Balun & Chokes
I chose the LFB095051 ferrite tubes - sleeves with similar characteristics to the Mix31, therefore excellent for 80 and 160

9:1 Impedance Transformer, VK1NAM
a 9:1 unbalanced to unbalanced UNUN impedance transformer, is to experiment with an Inverted V end fed antenna for 80 to 17m, I'm not aiming for transmission on 12 and 10m

10 m| 12 m| 15 m|
17 m 20 m| 2 m|
23 cm| 30 m| 40 m
6 m| 70 cm| 80 m| 160 m| 136 khz
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