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ANTENTOP- 01- 2009, # 011

Top Fed Five Band Vertical Antenna

 

 

 

Table 1 Data for Loop Choke

 

 

Band, MHz

Numbers of turns

Length of the wire, cm

C, PF

Q

7

3

160

150

260

14

2

115

68

230

21

2

80

47

210

28

2

60

36

265

 

 

 

 

 

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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