ANTENNAS AND FEED LINES
Subelement T9
Section T9B
Feed lines: types, attenuation vs frequency, selecting; SWR concepts; Antenna tuners (couplers); RF Connectors: selecting, weather protection
Which of the following connectors should be carefully taped for weather protection when used outdoors?
-
PL259
-
BNC
-
Type N
-
Correct AnswerAll these choices are correct
This question does not yet have an explanation!
Register to add one
Tags: none
What is the most common impedance of coaxial cables used in amateur radio?
-
8 ohms
-
Correct Answer50 ohms
-
600 ohms
-
12 ohms
This question does not yet have an explanation!
Register to add one
Tags: none
Why is coaxial cable the most common feed line for amateur radio antenna systems?
-
Correct AnswerIt is easy to use and requires few special installation considerations
-
It has less loss than any other type of feed line
-
It can handle more power than any other type of feed line
-
It is less expensive than any other type of feed line
This question does not yet have an explanation!
Register to add one
Tags: none
What is the major function of an antenna tuner (antenna coupler)?
-
Correct AnswerIt matches the antenna system impedance to the transceiver's output impedance
-
It helps a receiver automatically tune in weak stations
-
It allows an antenna to be used on both transmit and receive
-
It automatically selects the proper antenna for the frequency band being used
This question does not yet have an explanation!
Register to add one
Tags: none
What happens as the frequency of a signal in coaxial cable is increased?
-
The characteristic impedance decreases
-
The loss decreases
-
The characteristic impedance increases
-
Correct AnswerThe loss increases
This question does not yet have an explanation!
Register to add one
Tags: none
Which of the following connector types is most suitable as an RF connector for frequencies above 400 MHz?
-
PL-259
-
Correct AnswerType N
-
RS-213
-
DB-25
This question does not yet have an explanation!
Register to add one
Tags: none
Which of the following is true of PL-259 type coax connectors?
-
They are preferred for microwave operation
-
They are watertight
-
Correct AnswerThey are commonly used at HF and VHF frequencies
-
They are a bayonet-type connector
This question does not yet have an explanation!
Register to add one
Tags: none
Which of the following is a source of loss in coaxial feed line?
-
Water intrusion into coaxial connectors
-
High SWR
-
Multiple connectors in the line
-
Correct AnswerAll these choices are correct
This question does not yet have an explanation!
Register to add one
Tags: none
What can cause erratic changes in SWR?
-
Local thunderstorm
-
Correct AnswerLoose connection in the antenna or feed line
-
Over-modulation
-
Overload from a strong local station
This question does not yet have an explanation!
Register to add one
Tags: none
What is the electrical difference between RG-58 and RG-213 coaxial cable?
-
There is no significant difference between the two types
-
RG-58 cable has two shields
-
Correct AnswerRG-213 cable has less loss at a given frequency
-
RG-58 cable can handle higher power levels
This question does not yet have an explanation!
Register to add one
Tags: none
Which of the following types of feed line has the lowest loss?
-
50-ohm flexible coax
-
Multi-conductor unbalanced cable
-
Correct AnswerAir-insulated hardline
-
75-ohm flexible coax
This question does not yet have an explanation!
Register to add one
Tags: none
What is standing wave ratio (SWR)?
-
Correct AnswerA measure of how well a load is matched to a transmission line
-
The ratio of amplifier power output to input
-
The transmitter efficiency ratio
-
An indication of the quality of your station’s ground connection
This question does not yet have an explanation!
Register to add one
Tags: none
HamStudy.org™ is copyright 2026 Signal Stuff™, All rights
reserved.
View Privacy Policy | Get help with HamStudy.org™
View Privacy Policy | Get help with HamStudy.org™