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5-120.
Character Generator
1.
Perform the Basic Alignment Procedure of para 5-105.
2.
Turn the R2001B off and extend the Scope/DVM Control Board using the 100 pin extender card.
3.
Turn the R2001B on and select the Monitor FM Function and the Gen/Mon Mtr Display.
4.
Adjust the Horizontal Character Sweep Width Potentiometer on the Scope/DVM Control Board
(Figure 5-20) so that the right-hand edge of the CRT character display is approximately 4.2 graticule
divisions to the right of the graticule center line.
Figure 5-20.
Scope/DVM Control Char Sweep and Sinad Alignment Points
5.
Adjust the Vertical Character Sweep Width Potentiometer on the Scope/DVM Control Board (Figure 5-
20) so that the bottom edge of the CRT display is approximately 3.3 graticule divisions below the
graticule center line.
6.
Turn the system power off and reinstall the Scope/DVM Control Board into the R2001B.
5-121.
Sinad Notch Filter
1.
Turn the R2001B off and extend the Scope/DVM Control Board using the 100 pin extender card.
2.
Turn the R2001B on and select the Generate FM Function and the Gen/Mon Mtr Display.
3.
Set the Modulation Switch and the Ext. Level Control to their off positions. Set the BW Switch to the
Narrow position and adjust the 1 kHz Level Control for a 20kHz deviation reading on the CRT display.
4.
Connect the Mod Out Jack on the Iron panel to the Vert/Sinad/DVM/Counter Input Jack on the front
panel.
5-32
5.
Alternately adjust the two SINAD Notch potentiometers on the Scope/DVM Control Board (Figure
5-20) for a maximum SINAD reading on the CRT display. A reading greater than 30 dB should be
obtained.
6.
Turn the system power off and reinstall the Scope/DVM Control Bo<:rd into the R2001B.
5-122.
Receiver
5-123.
AM Detector
1.
Perform the basic alignment procedure of para 5-105.
2.
Turn the R2001B off and remove the Receiver Module. Remove the Receiver Module cover and install
the Receiver Test Cover on the module housing. Extend the Receiver module on the Receiver Extender
Card.
3.
Turn the R2001Bon and select the Monitor AM Function and the Gen/Mon Mtr Display. Set the monitor
frequency to 250 MHz. the RF Step Attenuator to the 0 dB position, and the BW Switch to the Narrow
position.
4.
Connect the external signal generator to the RF In/Out Jack on the front panel. Adjust the external
generator for an output level of approximately -60 dBm and a calibrated 30% AM.
5,
Adjust R60 (Marked on the Receiver Test Cover) for a reading of 30% ±5% on the CRT AM display.
5-124.
FM Detector
1.
Select the Monitor FM Function and the Gen/Mon Mtr Display. Set the monitor frequency to 250 MHz,
the RF Step Attenuator to the 0 dB position. and the BW Switch to the Wide position.
2.
Connect the external signal generator to the RF In/Out Jack on the front panel. Adjust the external
generator for a center frequency of 250 MHz at an output level of approximately -30 dBm and a
calibrated 20kHz FM.
3.
Adjust R70 (Marked on the Receiver Test Cover) for a reading of 20kHz± 1kHz on the CRT FM display.
4.
Set the BW switch to the Narrow position and reset the FM on the external generator to 3kHz deviation.
5.
Adjust R125 (Marked on the Receiver Test Cover) for a reading of 3kHz± 150Hz on the CRT FM
display.
6.
Turn off the FM on the external generator so thai a CW signal of a level of approximately -30 dBm is
applied to the R2001B.
7.
Connect the Demod Out Jack to the Vert/Sinad/DVM/Counter Input Jack on the front panel. Select the
DVM Display and the DC DVM Mode on the R2001B.
8.
Adjust R68 (Marked on the Receiver Test Cover) for a 0.0 VDC ±100 mVDC reading on the DVM
Display.
5-33
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