User Manual

Page 2 RF Technology R220
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 PWR LED 6
1.1.7 SQ LED 6
1.1.8 Alarm LED 7
2 Receiver Internal Jumper Options 7
2.1 JP1: 240Hz Notch Filter 7
2.2 JP2: Audio Response 8
2.3 JP3: Audio Filter In/Out 8
2.4 JP4: 600
Ω
Line dc Loop COS 8
2.5 JP6: COS Polarity 8
2.6 JP7/8/9: dc Loop COS Configuration 8
2.7 JP7, JP8, JP9: Direct Output COS 9
2.8 JP11 EPROM Type 9
3 Receiver I/O Connections 11
3.1 25 Pin Connector 11
4 Channel and Tone Frequency Programming 12
5 Circuit Description 12
5.1 RF Section 12
5.2 IF Section 12
5.3 VCO Section 13
5.4 PLL Section 13
5.5 Audio Signal Processing 14
5.6 Noise Filter, Amplifier and Detector 14
5.7 Subtone Filter and CTCSS 14
5.8 External Squelch 15
5.9 Microprocessor Controller 15
5.10 Carrier Operated Switch 15
5.11 Voltage Regulator 16
6 Alignment Procedure 16
6.1 Standard Input Signal 16
6.2 RF Alignment 16
6.3 IF Alignment 17
6.4 Line Level Adjustment 18
6.5 Reference Oscillator Calibration 18