1.
The two basic types of transmission line are
2. If one wire of a transmission line is connected to ground, the line is
said to be _____.
3. The distance that a signal travels during one cycle is called the
_____.
4. One wavelength that a frequency of 450 MHz is _____ m.
5. A line 4 in. long represents one-half wavelength at a frequency of
_____ GHz.
6. The physical dimensions of a transmission line determine its _____.
7. To a generator, a transmission line looks like a(n) _____ made up
of distributed _____ and _____.
8. A coax line has a shield braid with an inside diameter of 0.2 in. and
a center conductor with a diameter of 0.057 in. The characteristic
impedance is _____ .
9. The attenuation of 250 ft of RG-11U coax at 100 MHz is _____ dB.
(SeeFig.9-7) (page 211-Frenzel)
10. For optimum transfer of power from a generator to a load of 52,
the transmission line impedance should be _____ .
11. The current and voltage along a properly matched line are _____.
12. If a transmission line is not terminated in its characteristic
impedance, _____ will develop along the line
13. If a load and line have mismatched impedances, power not
absorbed by the load will be _____.
14. Patterns of voltage and current variations along, a transmission
line with a mismatched load are known as _____.
15. A 52- coax bas a 36- antenna load. The SWR is _____.
16. If the load and line impedances are matched, the SWR will be
_____.
17. All incident power on a line will be reflected if the line is _____ or
_____ at its end.
18. The ratio of the reflected voltage to the incident voltage on a
transmission line is called the _____.
19. The maximum voltage along a transmission line is 150V, and the
minimum voltage is 90V. The SWR is _____.The reflection coefficient
is _____.
20. The reflection coefficient of a transmission line is 0.75. The SWR is
_____.
21. An open or shorted transmission line will have a reflection coefficient of
_____ and an SWR of _____.
22. Transmission lines, one-quarter or one haIf wavelength can be used as
_____.
23. A transmission line bas an SWR of 1.75. The power applied to the line, is
90 W. The amount of reflected power is _____ W.
24. A shorted quarter-wave line looks like a(n) _____ impedance to the
generator.
25. The following lines look like a series resonant circuit: a _____ /4 line; a
_____ /2 line.
26. Transmission lines less than /4 or between /4 and /2 act like _____ or
_____.
27. An open transmission line 6 in. long acts as a _____ resonant circuit at a
frequency of 492 MHz.
28. A coax bas a velocity factor of 0.68. One half wavelength of this coax at
120 MHz is _____ ft long.
29. Radio waves are made up of _____ and _____ fields.
30. The polarization of a radio wave depends upon the position of its _____
with respect to the earth’s surface.
1. balanced, coax
2. unbalanced
3. wavelength
4. 0.667
5. 1.475
6. characteristic or surge impedance
7. low-pass filter, capacitors, inductors
8. 75.23
9. 6.25
10. 52
11. constant or fiat
12. standing waves
13. reflected
14. standing waves
15. 1.44
16. 1
17. open, shorted
18. reflection coefficient
19. 1.67,0.25
20. 7
21. 1, infinity
22. tuned or resonant circuits
23. 6.3 [0.07(90)=6.3] (See Fig. 9-12.)
24. high or infinite
25. open, shorted
26. inductors, capacitors
27. series
28. 2.788
29. electric, magnetic
30. electric field
