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Open Air Choke Balun


There are naming conventions for baluns as well, such as voltage, current and open air choke baluns
post 17 Dec 2021


Toroid & balun Links

213



1:1 current choke balunn
A 1:1 balun It offeres a almost flat swr curve from 1 to 30 MHz

1:4 Balun for 80m through 10m
Made from Amidon FT-114-43 core, 16 gauge speaker wire, and tie wraps

1:4 balun, 50 ohm unbalanced to 200 ohm balanced
Of course you can not take every ferrite core, it must already be suitable for high frequency shortwave

4:1 Voltage balun
The length of enamelled copper wire per winding for the T-200-2 powdered iron toroid core is determined by length per winder = 50mm per turn plus 200mm tails

Circuits of 1:1 and 4:1 transformer baluns
A balun is a transformer, a one to one balun 1:1 transforms, for , a 50 ohm balanced feed point on an aerial to 50 ohm unbalanced coax

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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