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RT-85
AWA RT-85 Manuals
Manuals and User Guides for AWA RT-85. We have
1
AWA RT-85 manual available for free PDF download: Technical Handbook
AWA RT-85 Technical Handbook (54 pages)
Carphone
Brand:
AWA
| Category:
Two-Way Radio
| Size: 3.88 MB
Table of Contents
Table of Contents
3
Specifications
7
Transmitter Specifications
8
Receiver Specifications
9
Features & Options
11
Standard Features
11
Hardware Options
13
Ctcss
13
Selcall
13
Programming Features
14
Externally Connected Options
14
Operating Instructions
15
Standard Equipment
15
Power On/Off
15
Channel Selection
15
Transmitting
16
Channel Scanning
16
Scanning Operation
17
Operating with CTCSS Encoder
17
Operating with Standard Selcall Decoder/Encoder
17
Receiving Calls
17
Theory of Operation
19
Synthesizer
19
Transmitter
19
Receiver
19
Microcomputer and EPROM
20
Transceiver Block Diagram
21
Transmitter Assembly
22
General Description
22
Circuit Description
22
Central Microprocessor
22
Control Unit
23
Internal Logic
23
Central Microprocessor Controls
23
EPROM and PLL Control
24
Master Frequency Oscillator
24
Main Frequency Synthesizer
25
EPROM and Shift Register
25
Programmable Dividers, Prescaler and Phase Detector
25
Voltage Controlled Oscillator and Buffers
27
Transmitter Audio Circuit and Phase Modulator
27
Transmitter Phase Locked Loop
27
Exciter Output and out of Lock Protection
27
Transmit Phase Locked Loop
28
DC Power Regulations
29
Top Side
30
Bottom Side
31
Receiver Assembly
38
Identification
38
Front End, Mixer and First if
38
Second if and Discriminator
38
Noise Squelch and Audio Gate
39
Speaker Amplifier
39
DC Input Relay
39
Power Amplifier Assembly
44
Power Amplifier Circuit
44
TX/RX Antenna Switch
44
PA Power Detector and Regulator
45
Antenna Low Pass Filter
45
Adaptor Assembly
47
Audio Mute
47
LED Drivers
47
Display Multiplexing
50
Control Unit Display/Switch Interconnection
51
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