Motorola GP360 Series Informasi Layanan - Halaman 11

Jelajahi secara online atau unduh pdf Informasi Layanan untuk Radio Dua Arah Motorola GP360 Series. Motorola GP360 Series 32 halaman. Professional radio, power distribution and controller
Juga untuk Motorola GP360 Series: Lembar Spesifikasi (2 halaman), Panduan Pengguna Dasar (18 halaman), Petunjuk Pengoperasian (4 halaman), Informasi Layanan (30 halaman), Informasi Layanan (30 halaman)

Halaman Cetak
Motorola GP360 Series Informasi Layanan
1.0

Introduction

This Chapter provides a detailed theory of operation for the UHF circuits in the radio. For details of
the theory of operation and trouble shooting for the the associated Controller circuits refer to the
Controller Section of this manual.
2.0

UHF Transmitter

(Refer to Figure 2-1 and the UHF Transmitter schematic diagram)
The UHF transmitter consists of the following basic circuits:
1.
Power amplifier (PA).
2.
Antenna switch/harmonic filter.
3.
Antenna matching network.
4.
Power Control Integrated Circuit (PCIC).
From
VCO
2.1

Power Amplifier

The power amplifier (PA) consists of two principle devices:
1.
LDMOS PA driver IC, U101.
2.
LDMOS PA final stage, Q110.
The LDMOS driver IC provides 2-stage amplification using a supply voltage of 7.3V. The amplifier is
capable of supplying an output power of 0.3W (pins 6 and 7) with an input signal of 2mW at 3dBm
(pin16). The current drain is typically 160mA while operating in the frequency range of 403-470MHz.
P CI C
Vcontrol
Power
Amplifier
PA
Driver
Figure 2-1 UHF Transmitter Block Diagram.

THEORY OF OPERATION

Vcontrol
Antenna Switch/
P A Final
S t a g e
Harmonic Filter
Chapter 2
Antenna
Matching
Network