Operating instructions

Page 2 RF Technology R50
CONTENTS CONTENTS
1 OPERATING INSTRUCTIONS 1
1.1 FRONT PANEL C
ONTROLS AND
INDICATORS 1
1.1.1 Monitor Volume 1
1.1.2 Monitor Squelch 1
1.1.3 N.SQ 1
1.1.4 C.SQ 2
1.1.5 LINE 2
1.2 FRONT PANEL INDICATORS 2
1.2.1 PWR LED 2
1.2.2 SQ LED 2
1.2.3 ALARM LED 2
2 RECEIVER OPTIONS 3
2.1 SERIAL I/O PARAMETERS 3
2.2 RECEIVER LOW BATTERY LEVEL 3
2.3 LOOP VOLTS SELECT 3
2.4 COS SOURCE/SINK SELECT 3
2.5 COS POLARITY 4
2.6 NOISE BLANKER 4
2.7 ADVANCED SLOT SELECTABLE PARAMETERS 4
2.8 STANDARD CHANNEL PARAMETERS 5
3 RECEIVER I/O CONNECTIONS 5
3.1 25 PIN CONNECTOR 5
3.2 9 PIN FRONT PANEL CONNECTOR 6
4 CHANNEL PROGRAMMING AND OPTION SELECTIONS 6
5 CIRCUIT DESCRIPTION 7
5.1 R50 MASTER SCHEMATIC (SHEET 1) 7
5.2 M
ICROPROCESSOR
(SHEET 2) 7
5.3 RF SECTION (SHEET 3) 9
5.4 5.4 RECEIVER SECTION (SHEET 4) 10
5.5 VOLTAGE CONTROLLED OSCILLATOR (SHEET 5) 11
5.6 AUDIO PROCESSING SECTION (SHEET 6) 12
5.7 POWER GENERATION SECTION (SHEET 7) 13
6 FIELD ALIGNMENT (CALIBRATION) PROCEDURE 14
6.1 STANDARD TEST EQUIPMENT 14
6.2 INVOKING THE CALIBRATION PROCEDURE MANUALLY 14
6.3 THE "MISCELLANEOUS" C
ALIBRATION
PROCEDURE 14
6.4 LINE CALIBRATION PROCEDURE 15
6.5 THE "REFERENCE" CALIBRATION PROCEDURE 16
7 SPECIFICATIONS 16
7.1 OVERALL DESCRIPTION 16
7.1.1 Channel Capacity 16
7.1.2 CTCSS 17
7.1.3 DCS 17
7.1.4 Channel Programming 17
7.1.5 Channel Selection 17
7.1.6 Microprocessor 17