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.