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ANTENTOP- 01- 2016 # 020

Modified Beverage Antenna

 

 

Table 2 shows SWR of the Beverage antenna with burned load measured by MFJ- 259B. MFJ- 259B does not indicates the character of the reactance (capacitance or inductive) so I used sign @ at the reactance.

As you could see from the tables the Beverage antenna with burned load (anyway, it is already not a Beverage antenna it is low profile wire antenna) became problematic to match with the transceiver at several bands, 160- meter was included.

 

 

 

Table 1

 

Beverage Antenna with LDG Transformer without Termination Load. Length of the 50- Ohm Coaxial Cable to antenna is 50. Measurement by IC-718

 

Band

160

80

40

30

20

17

15

12

10

SWR

15

3.2

2.5

3.2

1.8

2.8

2.5

2.8

1.8

 

 

Table 2

 

Beverage Antenna with LDG Transformer without a Termination Load. Length of the 50- Ohm Coaxial Cable to antenna is 50. Measurement by MFJ- 259B

 

Band

160

80

40

30

20

17

15

12

10

Z

9@j44

9@j30

21@j30

38@j56

27@j28

38@j50

100@j60

17@j8

114@j33

SWR

5.6

4.6

2.7

2.9

2.9

2.9

2.8

3.0

2.4

 

 

It was obviously at the reception. I heard lots electrical noise, useful signal fall down especially it was at 160, 80 and 40- meter bands. Anyway I attempted to restore my antenna back to Air. Simplest way was to use an ATU. I have MFJ VERSA TUNER II. In minutes the ATU was switched between transceiver and antenna cable. But nobody answered me. Electrical cracks and electrical noise was so much hindered to the reception. I had matched only antenna cable to my transceiver not the antenna wire with cable. ATU could not help me in the situation.

 

MFJ VERSA TUNER II at my Station

 

So I need to restore the antenna in right way. Right way was to install a new termination resistor. However I had not a new one good non- inductive termination resistor. I had only a termination resistor made of from 10 wire- wound resistors on 4k7 connected to bridge. The load had 450- Ohm at DC.

 

 

Termination Load on the Base of the Wire Wound Resistors

 

 

Wire Wound Resistor

 

 

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Last Updated:

April 2, 2016 22:49

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