ANTENTOP- 01- 2009, # 011

Top Fed Five Band Vertical Antenna

Table 1 Data for Loop Choke

Figure 2 Top Fed Five Band Antenna

Horizon part of the antenna has three pair wires in length 10- m (for 7 and 21- MHz), 5- meters (for 14- MHz), 2.5- meters (for 28- MHz). Chokes are placed (from the Top End): 7.5- meters for 28- MHz, 3.5 or 10.5- meters for 21- MHz, 5- meters for 14- MHz, 10- meters for 7- MHz. The sizes are approximately and should be corrected at antenna tuning.

For band 3.5- MHz the outer sheath of the coaxial is grounded to the ground after last Choke.

The distance is approximately and should be corrected at antenna tuning. It is possible to tune the antenna at 3.5- MHz by the coil or capacity that is switching on between the outer sheath of the coaxial and the ground.

The input impedance of the antenna at the bands 7- 14- 21- 28- MHz is close to 50- Ohm. The input impedance of the antenna at the band of 3.5- MHz is close to 100- Ohm.

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