Telecast Adder 162 User Manual page 21

A signal (tone) generator provides a clean output by which any channel and path can be
checked from the audio input right through to the de-multiplexed output at the receiving unit.
Both signal level and frequency are controllable and signal levels are calibrated and displayed
on a scale on the front panel.
The signal generator provides a convenient means for testing an audio channel. As seen in
Figure 18, the generator has two controls. The LEVEL dBm control sets the power for the
generator/monitor (including speaker and amplifier) to off or sets the levels to one of three
calibrated levels of -20 dBm, 0 dBm or +8 dBm. The second control, FREQUENCY, sets the
output to a choice of four frequencies æ 20 Hz, 400 Hz, 1 kHz, and 20 kHz.
Figure 18: Signal Generator/Monitor
To use the signal generator:
Connect the output labeled GENERATOR by XLR cable to any of the audio input points on an
input module. The Model 162/322 multiplexes that signal, sends it on the fiber, and de-muxes it
at the receiving assembly, which is then output at the same physical location number (row and
number) as the original input.
Connect the output channel by a cable to that unit's MONITOR input connector. Switch the
LEVEL to any setting other than OFF to enable the power to the monitor circuits. A signal level
is displayed on the level meter. Adjust the volume on the internal loudspeaker to hear the signal
(100 Hz - 10 kHz).
An external loudspeaker or headphones ( 8Ω or more) may be connected to the EXTERNAL
SPEAKER by adjusting the speaker volume knob, as shown in Figure 18.
This monitor scheme can be used with program audio as well as the generated test tone.
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