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Antentop is FREE e-magazine devoted to Antennas and Amateur Radio an

Special page devoted to

Experimenters

with

Non Snap Ferrite Cylinder

Bead RF Chokes

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ANTENTOP- 01- 2016 # 020

 Experimenters with Non Snap Ferrite Cylinder Bead RF Chokes

 

 

Conclusion:  The transformer may be used as Insulated Transformer for Receiver at the HF and MW. The transformer may be used for some purposes (like insulation transformer installed on antenna and then matched with coaxial cable) at transmission mode at the 160- 15 meter Bands.

 

 

 

Table 4 Four Cylinder Ferrite RF Chokes loaded to 51- Ohm Resistor. Data obtained with MFJ- 259B and IC-718

 

Band

160

80

40

30

20

17

15

12

10

Z by MFJ-259B

20@26

32@28

41@30

30@35

44@44

45@55

46@63

49@75

50@84

SWR by MFJ-259B

3.0

2.1

1.9

2.0

2.3

2.8

3.1

3.6

4.0

SWR by

IC-718

-

2.0

2.0

2.0

2.2

2.7

2.9

3.5

-

 

 

So, the experiment shows that the Ferrite "Bead" RF Choke could be successfully used for radio amateur purposes. It is possible to make with the stuff Insulated Receiving Transformer, similar to: 

 

Insulation RX Transformer,

 

http://www.antentop.org/019/insulation_transformer_019.htm

 

 

As well RF transformer made on Ferrite "Bead" RF Choke may be used with some special antennas in transmitting/receiving mode.

 

Ferrite "Bead" RF Choke made like a weather proof part. So transformer made on the base may be placed outside with very light weather proof prevention measures, straight away at the receiving or transmitting antenna.

 

73! Igor, VA3ZNW

 

Antarctica. 1961 year. Memory Envelope.

 Mark at destination Area: Antarctica. Station Vostok. (Continental Station.1253 km from South Pole)

Mark on the stamp: Antarctica. Mirnyy. (Coast Station at Davis Sea, 1410 km from Station Vostok)

 

 

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April 9, 2016 23:08

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