Functional description of PCBs
Manpack Transceiver 2110 series Repair Guide 37
PA & Filter PCB
The PA & Filter PCB performs the following functions:
• amplifies the modulated Tx input signal to 25 W
• provides ALC for the Tx signal
• provides linear dynamic bias for the output transistors
• provides ALC (detection of forward and reflected powers, PA collector voltage,
battery voltage, Tx/Rx relay failures, and thermal control of PA stage)
• provides low-pass filtering to reduce spurious emissions
The PA & Filter PCB contains:
• a gain control circuit (V25, V26)
• a pre-driver circuit (V29 to V32)
• the main power amplifier circuit (V36, V37)
•a PIC (IC1)
• a DC power relay (K12)
• forward and reflected power detection (D1, D2)
• an ALC circuit (IC7, IC8))
• thermal control circuit (IC8)
For details on the PA & Filter PCB,
Codan part number
See...
08-06064-001 Table 9 on page 38 and
Figure 12 on page 30
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