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equipment will be required. If not, remove the test equipment (except dummy load and wattmeter, if
connected) before proceeding.
Correct alignment requires that the ambient temperature be the same as that of the transceiver and test
equipment, and that this temperature be held constant between 20 and 30 C (68 86F). When the
transceiver is brought into the shop from hot or cold air it should be allowed some time for thermal
equalization with the environment before alignment. If possible, alignments should be made with
oscillator shields and circuit boards firmly affixed in place. Also, the test equipment must be
thoroughly warmed up before beginning.
Note: Signal levels in dB referred to in this procedure are based on 0 dBm = 0.5 mV(closed
circuit).
PLL & Transmitter
Set up the test equipment as shown for transmitter alignment.
Maintain the supply voltage at 13.8V DC for all steps.
Press the [LOW] and [D/MR] key, and hold while you turn the radio on. The radio now is in the
Alignment Mode.
PLL Reference Frequency
Tune the dail knob and select [TX FREQ], then press the [MHz] key. The radio now is in the
frequency tuning mode.
With the wattmeter, dummy load and frequency counter connected to the antenna jack, and while
tuned to 146.100 MHz, key the transmitter and tune the dail knob, if necessary, so the counter
frequency is within 100 Hz of 146.100 MHz. Then press the [MHz] key.
Transmitter Output
Tune the dail knob and select [TX PWR], then press the [MHz] key. The radio now is in the TX
power tuning mode.
Key the transmitter, and rotate the dail knob so as to achieve 5 Watts on the wattmeter. Then press the
[LOW] button.
Rotate the dail knob so as to achieve 10 Watts on the wattmeter. Then press the [LOW] button.
Rotate the dail knob so as to achieve 25 Watts on the wattmeter. Then press the [LOW] button.
Rotate the dail knob so as to achieve 50 Watts on the wattmeter. Then press the [LOW] button.
Transmitter Deviation
While tuned to 146.000 MHz, adjust the AF generator level for 50 mV output at 1kHz to the MIC
jack.
Tune the dail knob and select [MAX DEV], then press the [MHz] key. The radio now is in the TX
deviation tuning mode.
Key the transmitter, and rotate the dail knob so as to achieve 4.2kHz on the deviation meter. Then
press the [LOW] button.
Receiver
Set up the test equipment as shown below for receiver alignment.
Interstage Transformers
S-Meter(S1) Calibration
1)
S1
The RF signal generator turned to 146.100MHz, set the generator for +/-3.5 kHz deviation with 1kHz
tone modulation,and set the output level for -7dBu at the antenna jack.
Tune the dail knob and select [S MTR], then press the [MHz] key. The radio now is in the S-Meter
