Moving the taps along the hairpin allows continuous adjustment of the impedance transformation, which is difficult with a solenoid coil.
2.
The impedance transformation circle along a transmission line whose characteristic impedance Z 0, i is smaller than that of the input cable Z 0.
3.
A transformer with a turns ratio of 3 : 1 would provide an impedance transformation of 9 : 1, which will match the antenna to a 50-ohm transmission line.
4.
A transformer with a turns ratio of 5 : 2 would provide an impedance transformation of 6.25 : 1, which will match the antenna to a 75-ohm transmission line.
5.
With the narrow band tuners, the L network has the lowest loss, partly because it has the fewest components, but mainly because it necessarily operates at the lowest Q possible for a given impedance transformation.
6.
Conversely, if Z 0, i > Z 0, the impedance curve should be off-centred towards the + x axis . Because the characteristic impedance of each transmission line segment Z 0, i is often different from that of the input cable Z 0, the impedance transformation circle is off-centred along the x axis of the Smith Chart whose impedance representation is usually normalized against Z 0.
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