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RF Technology R350/R500 Page 9
4 FREQUENCY PROGRAMMING
Function Signal Pins Specification
DC Power +12 Vdc
0 Vdc
1, 14
13, 25
+11.4 to 16 Vdc
Ground
Channel Select 1
2
4
8
10
20
40
80
21
9
22
10
23
11
24
12
BCD Coded
0 = Open Circuit
or 0 Vdc
Logic1 = +5 to +16 Vdc
RS232 Data In
Out
15
2
Test and Programming use
9600, 8 data 2 stop bits
600Ω Line Output
Line-
Line+
20
6
Transformer Isolated
Balanced 0dBm Output
150Ω / Hybrid
7
19
Discriminator Audio 18 AC coupled, unsquelched
Direct Audio Output 17 Direct AC Coupled Audio
Audio Ground 5 Direct Audio Ground
Sub-Audible Audio
Out
4 Unsquelched, 1-250 Hz
Carrier Operated Sw
Carrier Operated Sw
COS+
COS-
3
16
Opto-coupled Transistor
Switch (10mA 30V max)
External Squelch Input 8 <1 Vdc to Squelch
>2 Vdc or open circuit to
unsquelch
Table 3: Pin connections and explanations for the main, 25-pin,
D-shell Connector
- R350/R500 Receiver 1
- Contents 2
- 1 Operating Instructions 4
- 1.1.4 C.SQ 5
- 1.1.5 LINE 5
- 1.1.6 POWER LED 5
- 1.1.7 SQ LED 5
- 1.1.8 ALARM LED 5
- 2.2 JP2: Audio Response 6
- 3 Receiver I/O Connections 8
- 4 Frequency Programming 8
- 5 Circuit Description 10
- 5.3 VCO Section 11
- 5.4 PLL Section 11
- 6 Alignment Procedure 13
- 6.1 Standard Input Signal 14
- 6.2 RF Alignment 14
- 6.3 IF Alignment 14
- 7 Specifications 15
- 7.1.3 Channel Programming 16
- 7.1.4 Channel Selection 16
- 7.1.5 Microprocessor 16
- 7.3.1 Controls 16
- 7.3.2 Indicators 17
- 7.3.3 Test Points 17
- 7.4.1 Power Requirements 17
- 7.4.18 Audio Distortion 20
- 7.4.21 CTCSS 20
- A Engineering Diagrams 22
- R F Technology 23
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