PYE OLYMPIC M201

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AF AMPLIFIER MODULE (4)

AT27603

NOTE: This module (4) AT27603 has been superseded by the AF amplifier module (4) AT27703

Both modules are interchangeable and performances are identical.

Value



Part No.



Remarks/Code/Band

Capacitors

2n2



PN99602



C4,C5

10,u



PS99513



C1,C2,C3

22µ



PS99507



33tt



PS99508



Resistors

220



PM01428



560



PM01433



PM01436



Inductors

4,7µH



FT99003



Transistor

PBC108



FV05800



T R1

Integrated Circuit

Amp.



FU10299



I.C.1

Mechanical Items

PWB Mech. Assy.



AT12388

Guide 2 off



BT17558

Heatsink



BT36640

Pan. Hd. Screw Slot M2 x 8



QJ11427/A



2/Heatsink

Hex. Nut M2



QA11603/A



2/Heatsink

Washer



BT09720



2/Heatsink

Washer



QA15003/A



2/Heatsink

5.24

Main Page

Table of Contents4
General Information7
Summary of Data7
Introduction9
Equipment Variations10
Module Identification12
Installation and Operation13
Pre-Installation Checks13
Netting Procedures13
Test Frequency Crystal Information14
Contents List (Installation Items)14
Equipment Required14
Procedure15
Fig. 2.1 Typical Installation16
Fig. 2.2 Connection of 12V Supply17
Fig. 2.3 Connection of 24V Supply17
12V Supply17
Fig. 2.4 Connection of Amplifier A20018
Amplifier A20018
Antenna Information21
Fig. 2.6 Ancillary Items23
Operation25
Fig. 3.1 Receiver Block Diagram27
Technical Description27
Receiver Circuit Summary27
Fig. 3.2 Transmitter Block Diagram28
Transmitter Circuit Summary28
Fig. 3.3 Power Supply Block Diagram29
Power Supplies and Switching29
Receiver RF Unit30
Receiver Oscillator32
Receiver Multiplier32
10,7 Mhz Crystal Filter33
IF Amplifier, Detector, and AGC Module33
Noise Limiter, High and Low-Pass Filter34
Squelch if and Delayed AGC Module34
AF Amplifier Module36
Noise Squelch Module36
Low Power Transmitter Audio Module37
High Power Transmitter Modulator Module38
Transmitter Oscillator38
PA Module40
Antenna Filter Module42
Switching Module42
Regulator Module43
Receiver and Transmitter Oscillator Module (8) - Single Channel43
Receiver and Transmitter Oscillator Module (18) 12-Channel44
Receiver and Transmitter Oscillator Module (18) 6-Channel44
Precautionary Notes and General Information46
Construction47
Equipment Access48
Fig. 4.1 Main Unit Interior View48
Module Replacement50
Crystal Information50
Test Equipment51
Alignment Procedures and Performance Checks52
Fig. 4.2 Diode Probe Circuit Diagram52
Receiver Alignment54
Fig. 4.3 Test Extension Assemblies Kit55
Receiver Performance Checks57
Transmitter Alignment58
Transmitter Performance Checks60
Fault Location Checks - Transmitter60
Fig. 4.4 Audio Test Lead60
Detailed Signal Analysis of Receiver62
Fault Location Checks - Receiver64
Parts List66
Notation66
Ordering of Spare Parts66
Abbreviations66
Miscellaneous Items67
Receiver Multiplier Module68
Squelch if and Delayed AGC Module68
Noise Squelch Module76
Oscillator Module77
Low Power Tx Audio Module80
Tx Multiplier Module81
Motherboard86
High Power Tx Modulator Module87
Optional Servicing Accessories88
Fig. 6.1 Front and Rear Views of Equipment93
Fig. 6.2 Control Module - Component Location Diagram94
Fig. 6.4 Motherboard - Receiver Module Locations96
Fig. 6.5 M201 Receiver Circuit97
Fig. 6.6 Motherboard - Transmitter Module Locations98
Fig. 6.7 M201 Transmitter Circuit99
Fig. 6.8 Earlier Module Pwbs100
Fig. 6.9 Circuit Variation Noise Squelch Module100

PYE OLYMPIC M201 - Page 89

Table of Contents