T7C – Antenna and transmission line measurements and troubleshooting: measuring SWR, effects of high SWR, causes of feed line failures; Basic coaxial cable characteristics; Use of dummy loads when testing 

- [[T7C01]] (A)
What is the primary purpose of a dummy load? #card
	- A. To prevent transmitting signals over the air when making tests
	- B. To prevent over-modulation of a transmitter
	- C. To improve the efficiency of an antenna
	- D. To improve the signal-to-noise ratio of a receiver

- [[T7C02]] (B)
Which of the following is used to determine if an antenna is resonant at the desired operating frequency? #card
	- A. A VTVM
	- B. An antenna analyzer
	- C. A Q meter
	- D. A frequency counter

- [[T7C03]] (B)
What does a dummy load consist of? #card
	- A. A high-gain amplifier and a TR switch
	- B. A non-inductive resistor mounted on a heat sink
	- C. A low-voltage power supply and a DC relay
	- D. A 50-ohm reactance used to terminate a transmission line 

- [[T7C04]] (C)
What reading on an SWR meter indicates a perfect impedance match between the antenna and the feed line? #card
	- A. 50:50
	- B. Zero
	- C. 1:1
	- D. Full Scale

- [[T7C05]] (A)
Why do most solid-state transmitters reduce output power as SWR increases beyond a certain level? #card
	- A. To protect the output amplifier transistors
	- B. To comply with FCC rules on spectral purity
	- C. Because power supplies cannot supply enough current at high SWR
	- D. To lower the SWR on the transmission line

- [[T7C06]] (D)
What does an SWR reading of 4:1 indicate? #card
	- A. Loss of -4 dB
	- B. Good impedance match
	- C. Gain of +4 dB
	- D. Impedance mismatch

- [[T7C07]] (C)
What happens to power lost in a feed line? #card
	- A. It increases the SWR
	- B. It is radiated as harmonics
	- C. It is converted into heat
	- D. It distorts the signal

- [[T7C08]] (D)
Which instrument can be used to determine SWR? 
	- A. Voltmeter
	- B. Ohmmeter
	- C. Iambic pentameter
	- D. Directional wattmeter

- [[T7C09]] (A)
Which of the following causes failure of coaxial cables? #card
	- A. Moisture contamination
	- B. Solder flux contamination
	- C. Rapid fluctuation in transmitter output power
	- D. Operation at 100% duty cycle for an extended period

- [[T7C10]] (D)
Why should the outer jacket of coaxial cable be resistant to ultraviolet light? #card
	- A. Ultraviolet resistant jackets prevent harmonic radiation
	- B. Ultraviolet light can increase losses in the cable’s jacket
	- C. Ultraviolet and RF signals can mix, causing interference
	- D. Ultraviolet light can damage the jacket and allow water to enter the cable

- [[T7C11]] (C)
What is a disadvantage of air core coaxial cable when compared to foam or solid dielectric types? #card
	- A. It has more loss per foot
	- B. It cannot be used for VHF or UHF antennas
	- C. It requires special techniques to prevent moisture in the cable
	- D. It cannot be used at below freezing temperatures