User Manual

ALIGNMENT PROCEDURE AND PERFORMANCE TESTS
6-4
June 1997
Part No. 001-3412-002
6.3.6 RECEIVER ALIGNMENT
C A U T I O N
Do not key the transmitter with the generator con-
nected because severe generator damage may result.
1. Connect the test setup shown in Figure 6-3. Adjust
the power supply for +13.3V DC.
2. Measure the receive current drain. (Typically cur-
rent should be approximately 88 mA or 105 mA
with Loader Board.)
3. Preset tuning slugs of L211/L222 to the full clock-
wise position (slug in all the way).
4. Preset C221 to center position (slot in-line with axis
of part).
5. Readjust L222 counterclockwise 2 turns.
Figure 6-3 RECEIVER TEST SETUP
6.3.7 IF AND AUDIO ADJUSTMENTS
1. Load the synthesizer with the channel frequency.
2. Set the RF signal generator for this frequency with
a 1 kHz tone (modulated output shown below) at a
level of -47 dBm (1000 µV) and inject into J501.
1.5 kHz deviation 12.5 kHz BW (-X10 Radio)
3.0 kHz deviation 25.0 kHz BW (-X30 Radio)
NOTE: Maintain these deviation levels throughout
the test when measuring AC levels, SINAD and %
distortion.
3. Adjust L253 for +2.5V DC (±0.05V DC) at the
receive audio output, J201, pin 13.
4. Set the RF signal generator level to -105 dBm,
"unmodulated".
5. Set the generator frequency 3 kHz (-X10) or 5 kHz
(-X30) below channel center.
6. Adjust C221, then L211 for peak RSSI voltage.
NOTE: Use 2V scale on DVM.
7. Set the RF signal generator frequency back to chan-
nel center at -47 dBm with standard deviation level.
8. Adjust L222 for minimum distortion.
9. Set the RF signal generator to -105 dBm, "unmodu-
lated".
10.Adjust L211 for peak RSSI voltage.
NOTE: Use 2V scale on DVM.
11.Set RF generator back to standard deviation levels
and re-adjust L253 for peak audio output. Verify
audio output level of 150 mV RMS, ±50 mV RMS
at a DC bias of 2.5V DC, ±0.3V DC.
12.Measure the percent distortion. (Typically <3%.)
13.Adjust the RF input level until 12 dB SINAD is
measured. (Typically <0.35 µV/-116 dBm).
14. Adjust the generator RF level to -120 dBm and
measure DC (RSSI) voltage on J201, pin 12.
(Typically ≤ 0.90V DC.)
15.Adjust the generator RF level to -60 dBm and mea-
sure DC (RSSI) voltage on J201, pin 12.
(Typically ≥ 2.40V DC.)
POWER SUPPLY
TX
RX
VOLTMETER
DC
+
-
COMMUNICATIONS
SERVICE MONITOR
DC AMMETER
+
-
ANALYZER
MODULATION
+13.3V DC
0-3A