ANTENTOP- 01- 2016 # 020

Experimenters with Non Snap Ferrite Cylinder Bead RF Chokes

Fourth experimental transformer was made with Four Cylinder Ferrite RF Chokes. Figure 10 shows schematic of the transformer. It was classical RF Transformer where one turn is primary and second turn is the secondary winding. Then the transformer was tested. Primary winding was connected to MFJ- 259B. Secondary winding was loaded on to 51- Ohm resistor. Figure 11 shows the transformer loaded to 51-Ohm resistor. Table 4 shows data obtained for the Four Ferrite RF Chokes transformer.

As you can see from the table the transformer had parameters better the one, two and three cylinder transformer. Certainly the transformer may be used for receiving purposes. I tested the transformer with my transceiver IC- 718 and receiver Hallicrafters S- 85. Transformer worked good up to 160- meter Band. As well the transformer performed well at MW band. Transformer was tested with IC-718 in transmitting mode, 15- wt. SWR showed by IC- 718 is close to SWR showed by MFJ- 259B.

Figure 11

 RF Transformer on Four Cylinder Ferrite RF Chokes loaded to 51- Ohm Resistor

Figure 10 RF Schematic for RF Transformer Made on Four Cylinder Ferrite RF Chokes

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