Operations Manual

Page 2 RF Technology T50
CONTENTS CONTENTS
Contents
1 Operating Instructions 5
1.1 Front Panel Controls and Indicators 5
1.1.1 PTT 5
1.1.2 Line 5
1.1.3 POWER LED 6
1.1.4 TX LED 6
1.1.5 ALARM LED 6
2 Transmitter Internal Jumper Options 7
2.1 Serial I/O Parameters 7
2.2 Line Terminators 7
2.3 Exciter Low Battery Level 7
2.4 External PA Parameters 7
2.5 LOOP Volts Select 7
2.6 Direct Audio (TONE) Select 8
2.7 Direct Audio (TONE) High Pass Filter Select 8
2.8 Transmit Time 8
2.9 Channel Selectable Parameters 8
3 Transmitter I/O Connections 8
3.1 25 Pin Connector 8
3.2 9 Pin Front Panel Connector 9
4 Channel and Tone Frequency Programming 10
4.1 Setting Options 10
4.2 Setting Channel Parameters 11
5 Circuit Description 13
5.1 T50 Master Schematic (Sheet 1) 13
5.2 Microprocessor (Sheet 2) 13
5.3 Audio Processing Section (Sheet 3) 13
5.4 Line Input Processing Section (Sheet 4) 13
5.5 Tone Generation Section (Sheet 5) 20
5.6 Frequency Synthesiser (Sheet 6) 21
5.6.1 The Modulation PLL 21
5.6.2 The Channel PLL 22
5.6.3 The External Reference Divider 23
5.6.4 The DAC 23
5.6.5 The VCOs and the RF Output 24
5.7 Voltage Controlled Oscillators (Sheet 7) 24
5.8 1W Broadband HF Power Amplifier (Sheet 8) 26
5.9 Power Generation Section (Sheet 9) 26
6 Field Alignment Procedure 27
6.1 Standard Test Equipment 27
6.2 Invoking the Calibration Procedure 28
6.3 The “Miscellaneous” Calibration Procedure 28
6.4 The “Reference” Calibration Procedure 29