Page 2
RF Technology R350/R500
CONTENTS
CONTENTS
Contents
1
Operating Instructions
4
1.1 Front Panel Controls and Indicators
4
1.1.1
Mon. Volume
4
1.1.2
Mon. Sq.
4
1.1.3
N. SQ
5
1.1.4
C. SQ
5
1.1.5
Line
5
1.1.6
PWR LED
5
1.1.7
SQ LED
5
1.1.8
Alarm LED
6
2
Receiver Internal Jumper Options
6
2.1 JP1: 240Hz Notch Filter
6
2.2 JP2: Audio Response
7
2.3 JP3: Audio Filter In/Out
7
2.4 JP4: 600
Ω
Line dc Loop COS
7
2.5 JP6: COS Polarity
7
2.6 JP7/8/9: dc Loop COS Configuration
7
2.7 JP7, JP8, JP9: Direct Output COS
8
2.8 JP11 EPROM Type
8
2.9 JP13: Squelch Defeat (pcb 30/9132/0002 or later)
9
2.10 JP19: LED Alarm output (pcb 30/9132/0002 or later)
9
3
Receiver I/O Connections
10
3.1 25 Pin Connector
10
4
Channel and Tone Frequency Programming
11
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 External Squelch
14
5.9 Microprocessor Controller
14
5.10 Carrier Operated Switch
14
5.11 Voltage Regulator
15
6
Alignment Procedure
15
6.1 Standard Input Signal
15
6.2 RF Alignment
16
6.3 IF Alignment
17
6.4 Line Level Adjustment
17
6.5 Reference Oscillator Calibration
17
