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5-142.
Power Monitor Mode
1.
Set the UUT to the Power Monitor Mode. Set the RF Step Atlenuator to the 30 dB position, and select
the Gen/Mon Mtr Display. Connect the RF power source to the RF In/Out Jack. Key the power source
and verify a correct power reading on the CRT display. Unkey the power source.
2.
Set the UUT to the Monitor Function and verify that the RF Step Allenuator is in the 30 dB position. Key
the RF power source and verify the presence of an audible alarm and a warning display on the CRT.
Unkey the power source.
5-143.
Monitor Mode
1.
Set the UUT to the Monitor FM Function. Set the Squelch Control to the OFF position and verify the
presence of a Sig Lvl indication and noise at the speaker. Turn the Squelch Control full on and verify
the absence of a Sig Lvl indication and noise at the speaker.
2.
Repeat paragraph 5-143.1 except for the AM Function.
3.
Repeat paragraph 5-143.1 except for the SSB/DSBSC Function and enable the BFO. After the testturn
the BFO off.
4.
Select the Narrow Band FM Monitor Function at 300 MHz and set the RF Step Allenuator to the 0 dB
position. Connect the RF Signal Generator to the RF In/Out Jack and the SINAD Meter to the Demod
Out Jack. Set the RF Signal Generator for a center frequency of 300 MHz and for 3kHz FM at a 1 kHz
rate. Adjust the RF output level from the Signal Generator for a 10 dB reading on the SINAD Meter.
Verify that the Signal Generator's level is less than -103 dBm (1.5
f.l
Vrms).
5.
Calibrate the RF Signal Generator for 3 kHz FM at 1 kHz rate using the Modulation Meter. Set the
Generator for a nominal output level of -60 dBm and connect it to the RF In/Out Jack of the UUT. Select
the Gen/Mon Mtr Display and verify a monitor deviation reading of 3kHz ±.150Hz.
6.
Calibrate the RF Signal Generator for 50 kHz FM at a 1 kHz rate. Select the Wide Band Mode on the UUT
and verify a reading of 50 kHz ±.2.5 kHz on the CRT deviation display.
7.
Calibrate the RF Signal Generator for 30% AM at a 1 kHz rate. Set the Generator for a nominal output
level of -60 dBm and connect it to the RF In/Out Jack of the UUT. Select the Monitor AM Function and
the Narrow Band Mode. Verify a monitor AM reading of 30% ±.5%.
8.
Monitor the% AM Displayed on the CRT while increasing the RF level out of the Signal Generator.
Verify that the IF Overload Warning occurs before the displayed AM exceeds a reading of 30% ±.5%.
9.
Select the Modulation Display on the UUT and verify the presence of the received modulation signal.
10.
Select the Gen/Mon Mlr Di,;play and the Wide Band Mode on the UUT. Vary the center frequency on
either the UUT or the Signal Generator and verify that the Frequency Error Display properly represents
the difference between the UUT's Center frequency and the Signal Generator's center frequency.
5-131.
Procedure
5-132.
Power On
1.
Check that the AC input power select card is in the 120 V postion. Connect the Unit Under Test (UUT)
to a 120 VAC line source with the front panel power switch off. Verify the presence of an AC indication
on the front panel.
2.
Set the power switch to the Standby Position. Verify the oven ready indicator is on.
3.
Set the power switch to the on position. Verify that alter a warm-up period a display is visible on the
CRT.
5-133.
Keyboard Check
1.
Verify that each key has the proper effect by observing the Gen/Mon Mlr Display and entering the
frequency 123.4567 MHz and the PL frequency 890. Check for proper cursor key operation.
2.
Verify that the up and down display keys perform properly and that the LED at each display illuminates.
3.
Verify that the up and down function keys perform properly and that the LED at each function
illuminates.
4.
Verify that the up and down modulation keys perform properly and that the LED at each modulation
mode illuminates.
5-134.
Nonvolatile Memory
1.
Select some random combination of Display. Function, and Modulation Modes. Simultaneously
depress both cursor keys and after a five second delay turn the system power OFF. Turn the system
power back ON and verify that the same Display, Function, and Modulation Modes are present.
5-135.
Modulation Capability
1.
Set the UUT to the Generate FM Mode and select the Gen/Mon Mtr Display. On the Gen/Mon Mtr
Display enter a DPL code of 111. Select the Oscilloscope Display and connect the Mod Out Jack to the
Vert In Jack. Set the code synthesizer to the Coni PL!DPL Mode. On thescopeverifythe presence of a
DPL waveform whose amplitude is variable with the code synthesizer level control.
2.
Move the Modulation Switch from CONT to OFF and verify that a short burst of 133Hz is output before
the output stops.
3.
Move the Modulation Switch to the BURST position. Verify that a 133Hz tone is output as long as the
switch is held in the BURST position.
4.
Select the Tone A Continuous Mode. Verify a Tone A output on the scope and at the speaker.
5.
Select the Tone Remote Mode. Verify that when the Modulation Switch is moved from OFF to BURST
11.
Select the IF Display on the UUT and verify the presence of an IF envelope on the CRT.
that a single Tone Remote Access Sequence is generated.
6.
Connect a microphone to the Mic Jack. Turn up the Ext Level Control and verify that speaking into the
mike causes a modulation signal to be output as observed on the scope display.
5-38
5-35
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