11.
Either the TS-2669/GCM or the 340B may be used to measure envelope
delay. One advantage of using the 340B instead of the TS-2669/GCM is
that the 340B has
a.
automatic phasing capability.
b.
meter readout of delay in milliseconds.
c.
digital readout directly in microseconds.
d.
a fixed-frequency carrier for reference return.
12.
When TS-2669/GCM's are used to measure envelope delay in the
reference-return method, the indication of delay can be observed at
the
a.
receive end only.
b.
transmit end only.
c.
midpoint of the line under test.
d.
either the transmit or receive end.
13.
The test equipment used to measure amplitude-vs-frequency distortion
is
a.
Envelope Delay Distortion Measuring Set TS-2669/GCM.
b.
Envelope Delay and Amplitude Equalizer CN-1234A/GCC.
c.
Oscilloscope, Tektronix Type 561A.
d.
Telephone Test Set AN/USM-181.
SITUATION
Assume that you are determining the amplitude-frequency response of a
telephone line as specified under parameter S3.
You are transmitting the
test tones specified in figure 2-4 from station A and they are received at
station B. Observed levels at station B are as follows:
Maximum level = -9.5 dBm at 0.3 kHz
Minimum level = -13 dBm at 2.9 kHz
1,000 Hz (1.0 kHz) level = -12 dBm
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