X2 Technical Service Manual 7-1
Publication No: 15-02047
7 Adjustments
7.1 Introduction
Preset adjustments, which are normally factory-set, will require attention
only if components that affect their settings are replaced. The X-2
Transceiver is provided with a special Test Mode, detailed in Section 7.5, to
assist in alignment and checks of filters, local oscillators and channel
frequencies.
7.2 Test Equipment Required
• Oscilloscope 50 MHz, complete with a 10X probe with a 10 MΩ and
less than 15 pF input impedance.
• RF Dummy Load 50Ω and Power Meter rated at 100 W RMS
minimum.
• RF Signal Generator covering the range of 400 kHz to 18 MHz.
Calibrated output signals from 10 millivolt to 0.5 µV from a source
impedance of 50 Ω.
• Frequency Counter 50 MHz with a resolution of 1 Hz.
• Regulated Power Supply of 13.6 V ± 0.2 V at 20 A peak.
• Two tone Audio Generator operating at 700 Hz and 2300 Hz complete
with 3 dB balance control and adjustable output 0-100 mV RMS.
• Digital Multimeter 10 MΩ input impedance.
• Transceiver Test Unit to Codan drawing 04-01868.
Note: The microphone isolating transformer should be fitted with a
mu-metal screen to prevent mains 50 Hz pickup.
• Resistance Box fitted with E12 series resistor range 10 Ω to 1 MΩ
assists in the selection of the SOT resistors.
• Spectrum Analyser for intermodulation measurements if required.
7.3 Voltage Regulators
None of the voltage regulators are adjustable. Only the output voltages can
be checked at the following locations:
104-02907 Sheet 1 and 3
1. On the Rx/Exciter & Control PCB:
• TP402
[B10] '
B' rail regulated DC (IC401) +10 V ± 0.2 V.
• TP403
[C7]
+5V - A regulated DC (IC402) +5 V ± 0.4 V.
• TP8
[D5]
+5V - B regulated DC (IC3) +5 V ± 0.4 V.
• TP6
[A4]
Switched DC supply (IC7/C), B rail voltage in
receive, 0 V in transmit.
•• TP7 Switched DC supply (IC7/D), B rail voltage in
transmit, 0 V in receive.
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