balanced antenna การใช้

Amateurs often use 300-450 ohm balanced antenna feeders.
The system consist of Master Antenna, matching transformer to match the balanced antenna with unbalanced cable and amplifiers.
In measuring the impedance or radiation pattern of a balanced antenna using a coaxial cable, it is important to place a balun between the cable and the antenna feed.
The TURF 25 Watt ( a separate unit to the radio ) is considered mandatory when using the VRC321 it tunes both unbalanced, end fed wires and whips and also balanced antenna such as the dipole.
When a balanced antenna is fed with a single-ended line, common mode currents can cause the coax line to radiate in addition to the antenna itself, distorting the radiation pattern and changing the impedance seen by the line.