Codan-radio MT-4E Analog and P25 Digital - Maintenance Guide Bedienungsanleitung Seite 44
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MAINTENANCE GUIDE | MT-4E ANALOG & P25 DIGITAL RADIO SYSTEMS
Chapter 5: Codan Radio System TestingPage 36
In the receiver RSS, enter the Service section and click on “Ref Oscillator”. The reference oscillator
frequency is shown as the “Target Synthesizer RF OUT”. Enter this RF frequency into the IFR 2975.
The receiver generates this frequency out of the Synthesizer into the IFR 2975.
Monitor the RF Error window on the IFR 2975. To change the reference frequency, adjust the softpot
slider in the RSS as shown in Figure 5-22. Adjust until the RF error is as close to 0 Hz as possible.
Click on the “Program” button to program in the new Reference Oscillator softpot value. The high and
low alarms are turned off.
Figure 5-22: RSS Receiver Reference Oscillator Alignment
Enter the L.O. Reference Oscillator Offset reading on the MT-4E Test Sheet.
- MT-4E Analog and 1
- P25 Digital 1
- Radio Systems 1
- Codan MT-4E 3
- Analog and 3
- Page ii 4
- Page iii 5
- Page iv 6
- Contents 7
- Page vi 8
- INTRODUCTION TO CODAN MT-4E 9
- REPAIR NOTE 10
- ESD - ELECTROSTATIC DISCHARGE 10
- Audio Levels 11
- Carrier Levels 11
- CHAPTER 2: INSTALLATION 13
- Chapter 2: InstallationPage 6 14
- Chapter 2: InstallationPage 8 16
- RECOMMENDED TEST EQUIPMENT 17
- RECOMMENDED SPARES 18
- RECOMMENDED MAINTENANCE ITEMS 19
- CHAPTER 4: RADIO SITE SURVEY 21
- PREPARATION FOR A SITE SURVEY 22
- EXTERIOR SITE SURVEY 23
- INTERIOR SITE SURVEY 23
- RADIO SITE INVENTORY 23
- RADIO SYSTEM TESTING 24
- DEPARTURE CHECKLIST 24
- Radio Service Software (RSS) 27
- Control Cards 27
- Audio Connections 29
- SYSTEM REGULATOR TESTING 30
- RECEIVER TESTING 31
- Audio Distortion: 32
- Reference Sensitivity: 33
- Squelch: 33
- Audio Level: 34
- Receiver Digital Testing 36
- Computer running RSS 38
- USB from 38
- Computer to Rx 38
- RECEIVER 40
- GEN T/R ANT 40
- SYSTEM REGULATOR 40
- -4E Test Sheet 44
- TRANSMITTER TESTING 45
- RF Power: 47
- Deviation Level: 48
- Transmitter CTCSS Testing 50
- Transmitter Digital Testing 53
- Computer to Tx 55
- SYSTEM TESTING 59
- Demodulated Audio Frequency: 60
- Distortion: 60
- Duplex Digital Testing 62
- Unit ID (SID): 64
- Emergency Bit (EMG): 64
- Algorithm ID: 64
- EQUIPMENT 66
- CONNECTED 67
- Receiver Desense 68
- LINK ANTENNA 69
- Spurious Signals over the Air 70
- CHAPTER 7: BLANK WORKSHEETS 71
- Radio Site Inventory 72
- MT-4E Radio System Test Sheet 73
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