Operating instructions

Page 2 RF Technology R350/R500
CONTENTS CONTENTS
Contents
1 Operating Instructions 5
1.1 Front Panel Controls and Indicators 5
1.1.1 Mon. Volume 5
1.1.2 Mon. Sq. 5
1.1.3 N. SQ 5
1.1.4 C. SQ 6
1.1.5 Line 6
1.1.6 Power LED 6
1.1.7 SQ LED 6
1.1.8 Alarm LED 6
2 Receiver Internal Jumper Options 7
2.1 JP1: 240Hz Notch Filter 7
2.2 JP2: Audio Response 7
2.3 JP3: Audio Filter In/Out 8
2.4 JP4: 600Ω Line dc Loop COS 8
2.5 JP6: COS Polarity 8
2.6 JP7, JP8, JP9: dc Loop COS Configuration 8
2.7 JP7, JP8, JP9: Direct Output COS 9
2.8 JP11 EPROM Type 9
2.9 JP13: Squelch Defeat (pcb 30/9131/0004 or later) 9
2.10 JP19: LED Alarm output (pcb 30/9131/0004 or later) 9
3 Receiver I/O Connections 9
3.1 25 Pin Connector 9
4 Frequency Programming 9
5 Circuit Description 11
5.1 RF Section 11
5.2 IF Section 11
5.3 VCO Section 12
5.4 PLL Section 12
5.5 Audio Signal Processing 13
5.6 Noise Filter, Amplifier and Detector 13
5.7 Subtone Filter and CTCSS 13
5.8 Microprocessor Controller 14
5.9 Carrier Operated Switch 14
5.10 Voltage Regulator 14
6 Alignment Procedure 14
6.1 Standard Input Signal 15
6.2 RF Alignment 15
6.3 IF Alignment 15
6.4 Line Level Adjustment 16
6.5 TCXO Calibration 16