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Beverage Antenna. Theoretical Look on Practical Result.

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ANTENTOP- 01- 2016 # 020

Beverage Antenna. Theoretical Look on Practical Result.

 

Table 2

 

Data for Beverage Antenna placed at 1.8 meter above the Ground with additional wire at termination side

(Figure 12), simulated with NEC for MMANA and measured practically by SWR- Meter of IC- 718

 

Band

160

80

40

30

20

17

15

12

10

 

Z

133+J736

601+J239

100-J172

1233-1518

401+326

353_51

417+104

622-204

277+711

 

SWR

12.56

1.71

5.16

7.12

2.14

1.32

1.29

1.65

6.14

 

Gain

-17

-10

-9.7

-1.21

-3.77

-2

-0.6

2.43

2.28

At Vertical degree

53

84

29

61

55

53

49

78

23

SWR by IC-718

1.3

1.0

3.0

3.5

3.0

1.1

1.0

1.0

1.2

 

 

As you can see from the Table 2 additional wire affected my Beverage Antenna. Antenna gain was increased (theoretically) near to 3 dB at all working Bands. However due high SWR I lost middle of HF Bands- 40, 30 and 20- Meter Bands. I cannot say that I have noticed significant difference in reception and transmission mode at the rest Bands. Below Figure 13 to Figure 11 show DD of the Beverage Antenna at the 160, 80, 40, 30, 20, 17, 15, 12 and 10- meter Bands in the vertical plane. Feedline with matching transformer is on the left side and the termination resistor is on the right side of the figures. DD the Beverage Antenna at 160 and 80 Meter Bands are practically identical so those ones shown at one figure- Figure 13.

 

As you can see from the Figure 13 - Figure 20 the DD of the Beverage Antenna with additional wire at termination load changed compare to classical Beverage Antenna. In theory the antenna should work better compare to my old one. However the antenna as well has signification radiation into zenith.

 

 

Figure 13

DD of modified Beverage Antenna with additional wire at termination load at 160 and 80- Meter Band

 

 

Figure 14

DD of modified Beverage Antenna with additional wire at termination load at 40- Meter Band

 

 

 

 

Figure 15

DD of modified Beverage Antenna with additional wire at termination load at 30- Meter Band

 

 

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September 4, 2016 0:11

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