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
Содержание 2110 series
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