a. 1/2 mw.
c. 1 mw.
b. 3/4 mw.
d. 2 mw.
SITUATION
The schematic of one type of line terminating circuit is shown in figure
2-7. It connects the incoming line to station equipment. The circuit includes
jacks, a 0-50-db variable attenuator, an equalizer having 10-db loss, a 42-db
fixed-gain amplifier and a pad with a 6-db loss.
Maximum undistorted output
power capability of the amplifier is +34 dbm.
Jacks permit inserting the
signal generator, decibel, and voltmeter at various points in the circuit for
testing.
The input and output impedances of all circuit components are 600
ohms.
As a circuit conditioner, you will be expected to determine transmission
losses and gains together with absolute and relative signal and noise levels.
Further, you will be expected to make circuit adjustments to meet network
requirements. The decibel and its derivatives are your tools.
Exercises 7 through 12 are based on this situation.
Figure 2-7.
Schematic diagram of a line terminating circuit.
7. Assume that the face of the -decibel meter reads: 1 mw in 600 ohms = 0.
This indicates that the decibel meter reads
a. gain of the amplifier.
b. loss of the circuit.
c. level in milliwatts.
d. level in dbm.
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