Lesson 3/Learning Event 3
(b) The line monitor section is connected to the receive side of
the circuit. To monitor the transmit side of the circuit under test, the
PRESS TO MONITOR TRANSMIT switch has to be pressed. The volume controls the
output to the speaker and output jack.
of a FREQUENCY CONTROL switch, OUTPUT LEVEL control and NONLINEAR DISTORTION
(a) Frequency control switch.
The frequency control switch
selects the transmit frequency control mode. When it is in the AUTO STEP
position, the transmit frequency is automatically stepped in 100 Hz
increments from 204 Hz to 3904 Hz at a rate controlled by the step rate
control. In the STEPPED 100 hZ position, the frequency in manually stepped
in 100 Hz increments from 204 Hz to 3904 Hz by pressing the UP or DOWN push
When the switch is in the MANUAL position the transmit
frequency is continuously variable over the range of 200 Hz to 3904 Hz by
adjusting the manual control.
(b) Output level control. The output level control is a variable
control, that will vary the transmitted test signal from a -49 dBm to a +10
(c) Nonlinear distortion key.
The nonlinear distortion key
permits comparison of a normal test signal and the receive test signal so
that compensation of background noise can be made.