Tough Questions

Question 1

ERP 150 Watt transmitter

Answer 1

286 Watts

Question 2

ERP 200 watt transmitter, 4dB feed line loss

Answer 2

317 watts

Question 3

ERP 200 watt transmitter, 2dB feed line loss

Answer 3

252 watts

Question 4

Extended double zepp antenna

Answer 4

Center fed 1.25 wavelength

Question 5

Feed point impedance at The center of a two wire folded dipole antenna (ohms)

Answer 5

300 ohms

Question 6

How much gain does an antenna have compared to a 1/2 wavelength diapole when it has 6 DB gain over and isotropic antenna

Answer 6

3.85 dB (only answer with a 3)

Question 7

How does the radiation pattern of a horizontally polarized three element meme antenna vary with increasing height above ground?

Answer 7

Takeoff angle decreases

Question 8

Radiation pattern 1/4, 1/4, 90° out of phase

Answer 8

Cardioid

Question 9

What is the process of normalization with regard to a Smith chart?

Answer 9

Reassigning impedance with regard to the prime center

Question 10

How must an antenna’s driven element be tuned to use a hairpin matching system?

Answer 10

Reactance must be capacitive

Question 11

Radiation pattern 1/4, 1/2, in phase

Answer 11

Figure 8 broadside

Question 12

Drawback of a small wire loop antenna for direction finding

Answer 12

Bidirectional pattern

Question 13

What usually occurs if a Yagi antenna is designed solely for maximum Forward gain

Answer 13

Front to back ratio decreases

Question 14

Physical length of a coaxial transmission line that is 1/4 wavelength long at 14.1 MHz

Answer 14

3.5 meters

Question 15

What parameter describes the interactions at the load end of a mismatch transmission line

Answer 15

Reflection coefficient

Question 16

Feed line to a generator:

1/8 wavelength shorted

1/8 wavelength open

Answer 16

Inductive reactance

Capacitive reactance

Question 17

Feed line to a generator:

1/4 wavelength shorted

1/4 wavelength open

1/2 wavelength shorted

Answer 17

Very high impedance

Very low impedance

Very low impedance

Question 18

Physical length of a transmission line 1/2 wavelength long at 14.10 MHz

Answer 18

10.6 meters

Question 19

Maximum power permitted on the 630 meter band

Answer 19

5 watts EIRP