Table Of Contents - Vertex Standard VX-450 series Service Manual

Table of Contents

Introduction1
Important Note1
Table Of Contents1
Specifications2
General2
Frequency Range2
Eia (Ce) Model3
Exploded View & Miscellaneous Parts (16 Key & 4 Key Type)4
Exploded View & Miscellaneous Parts (Non Key Type)5
Optional Accessories5
Parts List6
Version A & D6
Version I & K6
Block Diagram (Version A & D, 16 Key & 4 Key Type)8
Block Diagram (Version A & D, Non Key Type)14
Block Diagram (Version I & K, 16 Key & 4 Key Type)17
Block Diagram (Version I & K, Non Key Type)21
Circuit Description (Version A & D)24
Circuit Configuration By Frequency24
Receiver System24
Audio Amplifier24
Carrier Squelch25
Mic Amplifier25
Pll Frequency Synthesizer25
Vco25
Front-End Rf Amplifier27
Noise Squelch27
Squelch Circuit27
If Amplifier27
Vx-450 Series Uhf Band Service Manual27
Circuit Description (Version I & K)28
Pll29
Alignment30
Required Test Equipment30
Alignment Preparation & Precautions31
The Alignment Tool Outline31
Installation Of The Alignment Tool31
Action Of The Switches31
Alignment Mode32
Unit32
Vco (Rx Vco/Tx Vco)33
Pll Reference Frequency33
Rx Sensitivity34
Squelch35
Tight Sql Level (Ti Nsq W/N)35
Threshold Sql Level (Th Nsq W/N)35
Tight Sql Rssi Level (Ti Rssi W/N)35
Tv Power36
Maximum Deviation37
Modulation Balance38
Ctcss Deviation39
Dcs Deviation40
Dtmf Deviation41
Sequential Tone Deviation41
Vox On Level42
Tx Msk Level42
Ltr Deviation43
Battery43
Main Unit Circuit Diagram44
Main Unit (Version A & D)44
Main Unit Parts Layout46
Main-2 Unit (Version I & K)59
Main-2 Unit Parts Layout60
Main-2 Unit Circuit Diagram62
Main-2 Unit Parts Layout (Version I & K, Non Key Type)63
Display Unit Circuit Diagram (16 Key & 4 Key Type)65
Display Unit Parts Layout (16 Key & 4 Key Type)66