ex. RA0C, EY9AF, RA6XPL, RA6PS, RA6PGY
Line: Forum at cqham.ru
Yeh, it is too long title
for the article however it is the right one. Below it is described
two variants of wide band 1:4 RF transformer for matching 200
Ohm antenna to 50 Ohm coaxial cable. One transformer for unbalanced
another one for balanced antenna. Transformer works well at all
HF- Band from 160 to 10 meter. Transformer is very simple to do.
Design of the transformer is clear understandable from the schematic
tubes maybe taken from computer interferences choke that is usually
placed on monitor wires or sometimes on a keyboard wires or inside
the computer. As well the ferrite tube (divided on two halves)
may be taken from ferrite cable clip.
Figure 1 shows schematic of
the transformer for Unbalanced Antenna. Figure 2 shows pictures of the transformer for
Unbalanced Antenna. Figure 3 shows schematic of the transformer for
Balanced Antenna. Figure 4 shows pictures of the transformer for
Balanced Antenna. Figure 5 shows SWR of the transformer for Balanced
Antenna (it is almost the same as to Unbalanced antenna).