Pulsar TCF-10B, System Manual, Page: 69 / 249

Receiver Sensitivity
1. Place the Receiver Module on an Extender
Card (see Figure 4-1); set the Receiver at
535.0 kHz.
2. Set the Signal Generator at a level to produce
the following levels at INPUT and
COMMON test points on the Receiver
Module:
3. Turn the power “ON”.
4. On the Receiver Module front panel, set the
LEVEL ADJ attenuator (R3) to full CW.
5. Using the Selective Level Meter, monitor the
20 kHz output (high impedance input), at pin
28A (20 kHz IF output) 32A/C (common).
The output should be 65 mVrms ±5 mVrms. If
not, go to Step 6.
6. Adjust the IF Gain Control (R68) for the 20
kHz output level of 65 mVrms. If you adjust
R68 fully counterclockwise, and the output is
greater than 65 mVrms ±5 mVrms, adjust R3
until the output is 65 mVrms.
If the Voice Adapter Module is supplied,
see 5.7.5-3.
7. Turn “OFF” the power. Set the four rotary
switches on the Receiver Module to the
required frequency, and re-install the module
into the chassis.
CLI/Discriminator
1. Place the CLI/Discriminator Module on an
Extender Card, and turn “ON” the power.
For G07 thru G12 modules, ignore all CLI
tests; however, the “NOISE” and “LOW
LEVEL” LEDs on the front panel should light
as indicated in Table 5-7.
2. Set the Signal Generator to 250 kHz or the
required frequency.
3. After setting the Signal Generator to 250 kHz
or the required frequency, set the Signal
Generator to 1,060 mVrms (for Extra Wide
Band) or 353 mVrms (for Wide Band or
Narrow Band). Adjust R3 on the Receiver
until the CLI meter reads “+10.”
4. Vary the generator level as shown in
Table 5-7. Check the CLI instrument readings
on both the Internal CLI and External CLI
(when used). The instruments should read
within ±2 dB of the specified readings, and
within ±2 dB of each other.
5. Adjust the specified potentiometers, if
required:
• Low-Level Adjust (R40)
• External CLI Full-Scale Adjust (R110)
6. Replace the CLI/Discriminator Module in the
TCF–10B chassis. Adjust the input level for a
“0” CLI reading.
7. This step is for 2-frequency units (only).
Change the input frequency per the chart
below, while observing the “NOISE” LED:
The Noise LED should turn “OFF” in all of
the above cases, and the GUARD light should
be “ON.”
April 1997 Page 5–7
Chapter 5. Acceptance Tests
5
Extra 250.500 kHz or required
Wide Band fre 500 Hz
Wide Band 250.250 kHz or required
Wide Shift fre 250 Hz
Wide Band
Narrow Shift or 250.100 kHz or required
Narrow fre 100 Hz
Receiver Level
Bandwidth Module (Receiver Input)
Narrow Band 1606C32G03 5 mVrms
(300 Hz)
Wide Band 1606C32G02 5 mVrms
(600 Hz)
Extra Wide Band 1606C32G01 15 mVrms
(1,200 Hz)
NOTE
The 20 kHz IF must be within ±10 Hz before
you proceed with the following steps.
Adjust C68, on the Receiver PC board, if
necessary.