11. Assume that a circuit has been equalized to meet all requirements for
satisfactory voice communication.
If VF data signals are to be sent over
this circuit, the circuit conditioning technician must also check for
a. uniform frequency response.
b. variation in envelope delay.
c. overall line loss.
d. interference.
12. Telegraph carrier sending channels may cause degrading of the signal
quality in the presence of rising transmission speeds.
The primary cause
for this change in signal quality is the
a. shortened transition delays.
b. bandwidth of the send filters.
c. time delay in relay operation.
d. response of the electronic keying circuits.
13. The serial-parallel method of operating through FDM communication
terminals is intended to allow high-speed data signals to be transmitted
over
a. wide-band voice channels.
b. narrow-band voice channels.
c. wide-band telegraph channels.
d. narrow-band telegraph channels.
14. The most important
principle
in
minimizing
distortion
in
serial-
parallel operation is
a. sequential switching of the data bit stream.
b. sampling of the output signal of the receiving channel.
c. lengthening of the short data pulses to normal-length tt pulses.
d. synchronizing
the
receiving
converter
with
the
received
pulse
sequence.
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