Motorola GM1200E Service Manual Page 49
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GM1200E Tuning Procedure
Radio Tuning Procedure 4-3
1.3 Battery Threshold
The radio uses 2 battery threshold levels Tx High and Tx Low to determine the battery condition.
The Program buttons must only be activated when the power supply is set to the indicated voltage. If
the DPS detects that the voltage is not within the expected range for the threshold in question then a
message will be displayed to warn that the radio may not be set up correctly for the alignment
operation.
1. From the Service menu, select Transmitter Alignment.
2. Select Battery Threshold to open the battery threshold tuning window. The current softpot
values are displayed for information only and cannot be edited.
3. Set the supply voltage to the value indicated for TX High.
4. Click the TX High Program button to store the softpot value for TX High.
5. Set the supply voltage to the value indicated for TX Low.
6. Click the TX Low Program button to store the softpot value for TX Low.
7. Close the window by clicking Cancel.
1.4 Transmitter Power
The radio has two power level settings, a high power level setting, and a low power level setting.
IMPORTANT: To set the transmitter power for customer applications use the Common Radio
Parameters window under the Edit menu and set the “Low Power Level” and “High Power Level”
powers to the desired values. Only if the transmitter components have been changed or the
transmitter does not transmit with the power set in the Common Radio Parameters window the
following procedure should be performed.
The advanced power setting technology employed in the radio makes use of two reference power
level settings along with parameters describing the circuit behaviour. To determine these parameters
the DPS requires the power values measured for two different settings.
Table 4-1 Quiescent Current Alignment
RF-Band Target
UHF
VHF / 300-390MHz
440mA±10%
150mA±15%
CAUTION: Inadvertant use of the program buttons may result in radio failure.
CAUTION: When setting the Transmitter Power DO NOT EXCEED THE
RECOMMENDED POWER SET LIMITS of 25W.
- Mobile Radio 1
- Cautions and Warnings 3
- SAFETY WARNINGS 5
- Basic Service Manual 7
- Contents 8
- Chapter 1 9
- Table of Contents 10
- 1-ii General 10
- 4.1 Warranty Period 11
- Warranty and Service Support 12
- 1-2 General 12
- 403-470 MHz UHF 13
- 136-174 MHz VHF 13
- 6.0 Technical Specifications 15
- 6.3 Receiver 16
- 6.4 Self-Quieting Frequencies 16
- Chapter 2 17
- 2-ii Maintenance 18
- 1.0 Overview 19
- 2.0 Disassemble the Radio 19
- Disassemble the Radio 20
- 2-2 Maintenance 20
- 3.0 Assemble Radio 21
- 2-4 Maintenance 22
- Maintenance 2-5 23
- 5.0 Service Aids 24
- 6.0 Test Equipment 25
- Test Equipment 26
- 2-8 Maintenance 26
- Chapter 3 27
- 3-ii Accessories 28
- Accessories 3-1 29
- GM1200E Accessory Diagrams 30
- 3-2 Accessories 30
- Ref Motorola 31
- No. Part No. Description 31
- Adjustable Angle Bracket 32
- Mechanical Exploded View 33
- Hang-Up Clip Parts List 33
- Mechanical Parts List 33
- Schematic Diagram 34
- Electrical Parts Lists 34
- 2.4 DTMF Microphone GMN6148 35
- PCB Layout 37
- Electrical Parts List 38
- GMN6148_ 38
- Not shown 39
- Remote Front Housing 40
- GLN7331_ 40
- Remote Back Housing 40
- GLN7332_ 40
- Accessories 3-13 41
- Mechanical Hardware Kits: 44
- Microphones: 44
- Speakers: 44
- Chapter 4 45
- 4-ii Radio Tuning Procedure 46
- 1.0 GM1200E Tuning Procedure 47
- 1.2 PA Bias Voltage 48
- 1.3 Battery Threshold 49
- 1.4 Transmitter Power 49
- 1.5 Reference Oscillator 50
- 1.6 Front-End Pre-Selector 50
- 1.7 Rated Volume 51
- 1.8 Squelch 52
- 1.9 Transmit Voltage Limit 52
- 1.11 Transmit Deviation Limit 53
- 1.12 Signalling Alignments 53
- Appendix A 55
- A-ii PL (CTCSS) Codes 56
- 1.1 PL Codes 57
- 1.2 Digital PL (DPL) Codes: 57
- A-2 PL (CTCSS) Codes 58
- Appendix B 59
- B-ii NPD Application Notes 60
- (Radio Accessory Connector) 61
- (Radio Option Connector) 61
- 4.0 Other Calls 62
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