B-006-04: Line losses by line type, length and frequency
B-006-04-01:
Why should you use only good quality coaxial cable and connectors for a UHF antenna system?
To keep RF loss low
To keep television interference high
To keep the power going to your antenna system from getting too high
To keep the standing wave ratio of your antenna system high
B-006-04-02:
What are some reasons to use parallel-conductor feed line?
It will operate with a high SWR, and has less loss than coaxial cable
It has low impedance, and will operate with a high SWR
It will operate with a high SWR, and it works well when tied down to metal objects
It has a low impedance, and has less loss than coaxial cable
B-006-04-03:
If your transmitter and antenna are 15 metres apart, but are connected by 65 metres of RG-58 coaxial cable, what should be done to reduce feed line loss?
Shorten the excess cable
Shorten the excess cable so the feed line is an odd number of wavelengths long
Roll the excess cable into a coil which is as small as possible
Shorten the excess cable so the feed line is an even number of wavelengths long
B-006-04-04:
As the length of a feed line is changed, what happens to signal loss?
Signal loss increases as length increases
Signal loss decreases as length increases
Signal loss is the least when the length is the same as the signal's wavelength
Signal loss is the same for any length of feed line
B-006-04-05:
As the frequency of a signal is changed, what happens to signal loss in a feed line?
Signal loss increases with increasing frequency
Signal loss increases with decreasing frequency
Signal loss is the least when the signal's wavelength is the same as the feed line's length
Signal loss is the same for any frequency
B-006-04-06:
Losses occurring on a transmission line between transmitter and antenna results in:
less RF power being radiated
an SWR reading of 1:1
reflections occurring in the line
the wire radiating RF energy
B-006-04-07:
The lowest loss feed line on HF is:
open-wire
75 ohm twin-lead
coaxial cable
300 ohm twin-lead
B-006-04-08:
In what values are RF feed line losses expressed?
dB per unit length
ohms per MHz
dB per MHz
ohms per metre
B-006-04-09:
If the length of coaxial feed line is increased from 20 metres (65.6 ft) to 40 metres (131.2 ft), how would this affect the line loss?
It would be increased by 100%
It would be reduced by 10%
It would be increased by 10%
It would be reduced to 50%
B-006-04-10:
If the frequency is increased, how would this affect the loss on a transmission line?
It would increase
It is independent of frequency
It depends on the line length
It would decrease
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