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Table of Contents

1. General Information __________________________________________________ 3

1.1 Introduction _____________________________________________________________ 3

1.2 Warranty _______________________________________________________________ 3

1.3 DB1065 Features_________________________________________________________ 4

1.4 Handling Precautions _____________________________________________________ 4

1.4.1 Static Protection _____________________________________________________________ 4

1.4.2 Cleanliness _________________________________________________________________ 4

1.5 Unpacking ______________________________________________________________ 4

2. Electrical Performance ________________________________________________ 4

2.1 Absolute Maximum Ratings ________________________________________________ 4

2.2 Operating Characteristics __________________________________________________ 5

2.3 Prerequisites and Required Equipment ________________________________________ 6

2.3.1 Prerequisites ________________________________________________________________ 6

2.3.2 Power Supply _______________________________________________________________ 6

2.4 Limitations _____________________________________________________________ 6

3. Quick Start __________________________________________________________ 6

3.1 Introduction _____________________________________________________________ 6

3.2 First... _________________________________________________________________ 6

3.3 Second - Setup___________________________________________________________ 6

3.4 Third - Select and Execute a Test ____________________________________________ 7

3.4.1 CTCSS encoder verification ____________________________________________________ 7

3.4.2 Transmit audio path verification_________________________________________________ 8

3.4.3 CTCSS decoder verification ____________________________________________________ 8

3.4.4 Receive audio path verification _________________________________________________ 8

4. Fourth - Explore______________________________________________________ 9

4.1 Measuring CTCSS Encoder response time _____________________________________ 9

4.2 Measuring CTCSS Decoder response time _____________________________________ 9

4.3 Measuring CTCSS Decoder band width _______________________________________ 9

4.4 Measuring CTCSS response at different SINADs _______________________________ 9

4.5 Performance at other operating voltages______________________________________ 10

4.6 Connecting the DB1065 to a system _________________________________________ 12

4.7 TIA / EIA 603 __________________________________________________________ 13

5. Hardware __________________________________________________________ 14

5.1 Introduction ____________________________________________________________ 14

5.2 Description ____________________________________________________________ 14

5.2.1 Functional Layout of Circuitry _________________________________________________ 14

5.2.2 Connectors ________________________________________________________________ 14

6. Logic Table for operation______________________________________________ 16

6.1 I/O Conditions __________________________________________________________ 16

6.2 CTCSS Programming ____________________________________________________ 16

7. Troubleshooting _____________________________________________________ 17

7.1 Suggestions ____________________________________________________________ 17

7.2 If you still need help _____________________________________________________ 18

8. Retrofitting from older designs _________________________________________ 18

8.1 Comparison Specifications ________________________________________________ 18

8.2 External Components Comparison __________________________________________ 19