User Manual

6-1
June 1997
Part No. 001-3412-002
SECTION 6 ALIGNMENT PROCEDURE AND PERFORMANCE TESTS
6.1 GENERAL
Receiver or transmitter alignment may be neces-
sary if repairs are made that could affect tuning.
Alignment points diagrams are located in Figure 6-4
or component layouts are located in Section 8.
Fabricate test cables by referring to Figure 2-1.
This cable should include power and ground, a trans-
mit keying switch that shorts the keying line to
ground, data input and data output. The test setup
must apply the various supply voltages and load the
synthesizer with channel information.
6.2 TEST EQUIPMENT
l Modulation Analyzer, HP8901 or equivalent
l RF Signal Generator, HP8656 or equivalent
l Power Meter
l Oscilloscope
l Digital Multimeter
l Power Supply, HP8264A or equivalent
l Audio Analyzer, HP8903A or equivalent
l Loader Board (PN 023-3240-330) or equivalent
6.3 DL3412 TRANSCEIVER ONLY
6.3.1 VCO CONTROL VOLTAGE
1. Connect the test setup shown in Figure 6-1. Set the
power supply for +13.3V DC. See Figure 2-1 for
interface cable.
2. Load the synthesizer with the channel frequency
(see Section 3.2).
3. Connect a DC voltmeter at the junction of R833/
C836 (VCO pin 16) to measure the VCO control
line voltage for a meter reading of ≥ 0.50 and
≤ 4.90V DC (see Figure 6-4).
NOTE: These voltages will be approximately 0.50V
DC higher with the VCO cover off.
4. Adjust R535 fully counterclockwise and key the
transmitter.
5. Connect a DC voltmeter at the junction of R833/
C836 (VCO pin 16) to measure the VCO control
line voltage for a meter reading of ≥ 0.75 and
≤ 5.00V DC (see Figure 6-4).
NOTE: These voltages will be approximately 0.50V
DC higher with the VCO cover off.
6. Unkey the transmitter.
6.3.2 TRANSMITTER AND FREQUENCY ALIGN-
MENT (OEM Not Using Diagnostics)
1. Connect the test setup shown in Figure 6-1. A DC
ammeter capable of measuring up to 3A should be
installed in the supply line. Set the input voltage for
+13.3V DC.
2. Load the synthesizer with the channel frequency.
(Do not transmit for extended periods.)
3. Adjust R535 clockwise for 5.0W +0.5/-0.2W.
Power output should be between 4.0-6.0W with cur-
rent less than 2.5A (subtract 30 mA if Loader Board
is used).
Figure 6-1 TRANSMITTER TEST SETUP
POWER SUPPLY
+13.3V DC
TX
RX
VOLTMETER
DC
+
-
WATTMETER5W, 50 OHM
DUMMY LOAD
COMMUNICATIONS
SERVICE MONITOR
0-1.5A
DC AMMETER
+
-
ANALYZER
MODULATION