Checkpoint: T9B — HAM Trainer

T9B01 Which of the following connectors should be carefully taped for weather protection when used outdoors?

A PL259 B BNC C Type N D All these choices are correct

T9B02 What is the most common impedance of coaxial cables used in amateur radio?

A 8 ohms B 50 ohms C 600 ohms D 12 ohms

T9B03 Why is coaxial cable the most common feed line for amateur radio antenna systems?

A It is easy to use and requires few special installation considerations B It has less loss than any other type of feed line C It can handle more power than any other type of feed line D It is less expensive than any other type of feed line

T9B04 What is the major function of an antenna tuner (antenna coupler)?

A It matches the antenna system impedance to the transceiver's output impedance B It helps a receiver automatically tune in weak stations C It allows an antenna to be used on both transmit and receive D It automatically selects the proper antenna for the frequency band being used

T9B05 What happens as the frequency of a signal in coaxial cable is increased?

A The characteristic impedance decreases B The loss decreases C The characteristic impedance increases D The loss increases

T9B06 Which of the following connector types is most suitable as an RF connector for frequencies above 400 MHz?

A PL-259 B Type N C RS-213 D DB-25

T9B07 Which of the following is true of PL-259 type coax connectors?

A They are preferred for microwave operation B They are watertight C They are commonly used at HF and VHF frequencies D They are a bayonet-type connector

T9B08 Which of the following is a source of loss in coaxial feed line?

A Water intrusion into coaxial connectors B High SWR C Multiple connectors in the line D All these choices are correct

T9B09 What can cause erratic changes in SWR?

A Local thunderstorm B Loose connection in the antenna or feed line C Over-modulation D Overload from a strong local station

T9B10 What is the electrical difference between RG-58 and RG-213 coaxial cable?

A There is no significant difference between the two types B RG-58 cable has two shields C RG-213 cable has less loss at a given frequency D RG-58 cable can handle higher power levels

T9B11 Which of the following types of feed line has the lowest loss?

A 50-ohm flexible coax B Multi-conductor unbalanced cable C Air-insulated hardline D 75-ohm flexible coax

T9B12 What is standing wave ratio (SWR)?

A A measure of how well a load is matched to a transmission line B The ratio of amplifier power output to input C The transmitter efficiency ratio D An indication of the quality of your station's ground connection