Motorola GM1200E

Table of Contents
Introduction/Theory of Operation 3.1-iii
Paragraph Page
VHF (136-174MHz) SPECIFIC CIRCUIT DESCRIPTION
11.0 Receiver Front-End ................................................................................. 25
11.1 Front-End Band-Pass Filter and Pre-Amplifier.......................................... 25
11.2 Mixer and Intermediate Frequency (IF) Section........................................ 26
11.3 IF IC (U5201) ............................................................................................ 26
12.0 Transmitter Power Amplifier (PA) 5-25W ............................................... 26
12.1 Power Controlled Stage............................................................................ 27
12.2 PA Stages................................................................................................. 27
12.3 Directional Coupler ................................................................................... 27
12.4 Antenna Switch......................................................................................... 28
12.5 Harmonic Filter.......................................................................................... 28
12.6 Power Control ........................................................................................... 28
13.0 Frequency Synthesis .............................................................................. 30
13.1 Reference Oscillator ................................................................................. 30
13.2 Fractional-N Synthesizer (U3701)............................................................. 30
13.3 Voltage Controlled Oscillator (VCO) ......................................................... 30
13.4 Synthesizer Operation .............................................................................. 31