Operating instructions

2
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 6
2.1 Serial I/O Parameters 6
2.2 Line Terminations 7
2.3 Exciter Low Battery Level 7
2.4 External PA Parameters 7
2.5 Generate Loop 7
2.6 External Tone Input 7
2.7
External Tone, High Pass Filter Bypass
7
2.8 Transmit Time 7
2.9 Channel Select Override 7
2.10 CWID Start Delay 7
2.11 CWID Period 8
2.11 CWID Message 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 9
5 Circuit Description 10
5.1 T50 Master Schematic (Sheet 1) 10
5.2 Microprocessor (Sheet 2) 10
5.3 Audio Processing Section (Sheet 3) 13
5.4 Line Input Processing Section (Sheet 4) 14
5.5 Tone Generation Section (Sheet 5) 15
5.6 Frequency Synthesiser (Sheet 6) 16
5.7
Voltage Controlled Oscillators (Sheet 7)
18
5.8 1W
Broadband HF Power Amplifier (Sheet 8)
20
5.9 Power Generation Section (Sheet 9) 20
6 Field Alignment Procedure 21
6.1 Standard Test Equipment 21
6.2 Invoking the Calibration Procedure Manually 21
6.2.1 The “Miscellaneous” Calibration Procedure 22
6.2.2
The “Reference” Calibration Procedure
22
6.2.3
The “Deviation” Calibration Procedure
24
6.2.4
The “Tone Deviation” Calibration Procedure
25
6.2.5
The “Line” Calibration Procedure
25
6.2.6 The “Power” Calibration Procedure 26
7 Specifications 28