|Current Balun 1:1||Broadband-Balun 1:1||Balun 1:4||Balun 1:1 + 1:4||MTFT-Un-Uns|
MTFT-Un-Uns for Random Wires (all with FT240-43)
Un-Un with a fixed ratio of 1:9 (principle of core transformer)
For this Balun you will find a lot of examples for antennas in the web. Used for random wires and
built-in ATUs in the Transceivers. In most cases the ATU will tune the antenna.
Un-Un with ratios of 1:4, 1:9 or 1:16
In some cases other ratios are better and have less losses.
With this Un-Un you can find out the best ratio.
Here with a test resistor for proving the impedance.
Here a simpler Un-Un with fixed taps
For example the SWR with a 20-m-Longwire at 5 turns of the MTFT
The built-in-ATUs of TS-480, TS-590S and IC-7400 have no problem to tune this wire from 7-28 MHz in all bands.