B-006-05: Standing waves, standing wave ratio, SWR meter
B-006-05-01:
What does an SWR reading of 1:1 mean?
The best impedance match has been attained
An antenna for another frequency band is probably connected
No power is going to the antenna
The SWR meter is broken
B-006-05-02:
What does an SWR reading of less than 1.5:1 mean?
A fairly good impedance match
An impedance match which is too low
An impedance mismatch; something may be wrong with the antenna system
An antenna gain of 1.5
B-006-05-03:
What kind of SWR reading may mean poor electrical contact between parts of an antenna system?
A jumpy reading
A negative reading
No reading at all
A very low reading
B-006-05-04:
What does a very high SWR reading mean?
The antenna is the wrong length, or there may be an open or shorted connection somewhere in the feed line
The transmitter is putting out more power than normal, showing that it is about to go bad
There is a large amount of solar radiation, which means very poor radio conditions
The signals coming from the antenna are unusually strong, which means very good radio conditions
B-006-05-05:
What does standing-wave ratio mean?
The ratio of maximum to minimum voltages on a feed line
The ratio of maximum to minimum inductances on a feed line
The ratio of maximum to minimum resistances on a feed line
The ratio of maximum to minimum impedances on a feed line
B-006-05-06:
If your antenna feed line gets hot when you are transmitting, what might this mean?
The SWR may be too high, or the feed line loss may be high
You should transmit using less power
The conductors in the feed line are not insulated very well
The feed line is too long
B-006-05-07:
If the characteristic impedance of the feedline does not match the antenna input impedance then:
standing waves are produced in the feedline
heat is produced at the junction
the SWR reading falls to 1:1
the antenna will not radiate any signal
B-006-05-08:
The result of the presence of standing waves on a transmission line is:
reduced transfer of RF energy to the antenna
perfect impedance match between transmitter and feedline
maximum transfer of energy to the antenna from the transmitter
lack of radiation from the transmission line
B-006-05-09:
An SWR meter measures the degree of match between transmission line and antenna by:
comparing forward and reflected voltage
measuring radiated RF energy
measuring the conductor temperature
inserting a diode in the feed line
B-006-05-10:
A resonant antenna having a feed point impedance of 200 ohms is connected to a feed line and transmitter which have an impedance of 50 ohms. What will the standing wave ratio of this system be?
4:1
6:1
3:1
5:1
B-006-05-11:
The type of feed line best suited to operating at a high standing wave ratio is:
600 ohm open-wire
75 ohm twin-lead
coaxial line
300 ohm twin-lead
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