Transmission lines other than one-quarter or one-half wavelength.

(e) The high Z line is attached to a high Z point in the frame.

(2) Figure 22, Part B.

(a) A half-wave section repeats the input impedance at the output.

(b) A 300-ohm half-wave section connects two lines having a Zo of

500 ohms.

(c) A proper impedance match results regardless of the Zo of the

half-wave section.

(3) Figure 22, Part C.

(a) Open-ended, half-wave section acts like a parallel-resonant

tank circuit.

(b) Voltage is maximum at the open ends of the section.

(c) The supply voltage (B+) and

the

grid-leak

resistor

are

attached at points of minimum RF voltage.

(d) No tuning arrangement provided.

(4) Figure 22, Part D.

(a) The voltage is maximum at the input terminals (A).

(b) One-quarter wavelength away, the voltage drops to zero (B).

(c) Beyond B, the voltage again increases but in opposite phase.

(d) The voltage at the output terminals (C) has the same amplitude

as the voltage at A, but is 180 degrees out of phase with it.

33. Transmission lines other than one-quarter or one-half wavelength.

So far, we have emphasized the quarter-wave and the half-wave

sections of transmission lines. However, there are many applications that

use lengths of transmission lines other than the two we have discussed.

Figure 23 summarizes the properties of transmission lines that are one-half

wavelength or less. The chart shows you that a short-circuited

27