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Modified Beverage Antenna

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ANTENTOP- 01- 2016 # 020

Modified Beverage Antenna

 

 

Five rings were inserted on to copper tube in ¼ inch OD. At one side a jumper connected the tubes. At the other side a wire was soldered to the tubes. It was winding for coaxial cable, 50- Ohm. Three turns of insulated wire (300- V, 20- AWG) were inserted inside of the copper tubes. It was second winding, 450- Ohm intended for Beverage Antenna. The transformer was covered by wide shrink that after thermal heating hold the rings.

 

Ready transformer was tested with small ¼- Wtt resistor on 450-Ohm. Table 5 shows data measured by MFJ- 259B. MFJ- 259B does not indicates the character of the reactance (capacitance or inductive) so I used sign @ at the reactance. It looks like the transformer was not optimal for the 160- meter band. Though I decided try it. After 5 minutes I have the transformer changed. I straight away did measurement of the Beverage

 

 

Antenna with Transformer with Insulated Windings. Table 6 shows data for Beverage Antenna with Transformer with Insulated Windings measured by MFJ- 259B. MFJ- 259B does not indicates the character of the reactance (capacitance or inductive) so I used sign @ at the reactance. Table 7 shows data for Beverage Antenna with Transformer with Insulated Windings measured by IC- 718.

 

SWR of the Beverage Antenna with the new transformer was good. For my opinion level of the electrical noise went down at all bands. The transformer with Insulated Windings worked well. Evening came to me and I turned on to the Test. The load worked the last part of CQ- WW- 160- Meter Contest without burning. After Contest I visually checked the termination load. It looked like new. During the test I made 124 QSO, 33- US States and 3 Canadian Provinces. Not bad.

 

So it is possible use at Beverage Antenna termination load made on the base of wire wound resistors. It was a little surprisingly for me.

 

 

 

Ferrite Rings and Copper Tubes for the RF Transformer with Insulated Windings

 

 

 

 

 

 

Ready Transformer with Insulated Windings

 

 

 

Table 5

 

Transformer 2x5 Rings loaded to a Metal Film Resistor in 450- Ohm. Measurement by MFJ- 259B

 

Band

160

80

40

30

20

17

15

12

10

Z

33@j24

43@j14

44@j8

42@j6

40@j5

37@j5

35@j5

33@j7

32@j9

SWR

1.9

1.4

1.2

1.2

1.2

1.3

1.4

1.5

1.6

 

 

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Last Updated:

April 2, 2016 22:50

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