B-005-08: Ratios, logarithms, decibels
B-005-08-01:
A two-times increase in power results in a change of how many dB?
3 dB higher
6 dB higher
12 dB higher
1 dB higher
B-005-08-02:
How can you decrease your transmitter's power by 3 dB?
Divide the original power by 2
Divide the original power by 1.5
Divide the original power by 3
Divide the original power by 4
B-005-08-03:
How can you increase your transmitter's power by 6 dB?
Multiply the original power by 4
Multiply the original power by 3
Multiply the original power by 2
Multiply the original power by 1.5
B-005-08-04:
If a signal-strength report is "10 dB over S9", what should the report be if the transmitter power is reduced from 1500 watts to 150 watts?
S9
S9 plus 3 dB
S9 minus 10 dB
S9 plus 5 dB
B-005-08-05:
If a signal-strength report is "20 dB over S9", what should the report be if the transmitter power is reduced from 1500 watts to 150 watts?
S9 plus 10 dB
S9 plus 5 dB
S9 plus 3 dB
S9
B-005-08-06:
The unit "decibel" is used to indicate:
a mathematical ratio
an oscilloscope wave form
certain radio waves
a single side band signal
B-005-08-07:
The power output from a transmitter increases from 1 watt to 2 watts. This is a db increase of:
3
30
6
1
B-005-08-08:
The power of a transmitter is increased from 5 watts to 50 watts by a linear amplifier. The power gain, expressed in dB, is:
10 dB
30 dB
40 dB
20 dB
B-005-08-09:
You add a 9 dB gain amplifier to your 2 watt handheld. What is the power output of the combination?
16 watts
11 watts
20 watts
18 watts
B-005-08-10:
The power of a transmitter is increased from 2 watts to 8 watts. This is a power gain of __________ dB.
6 dB
3 dB
8 dB
9 dB
B-005-08-11:
A local amateur reports your 100W 2M simplex VHF transmission as 30 dB over S9. To reduce your signal to S9, you would reduce your power to ______ watts.
100 mW
1 W
10 W
33.3 W
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