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Motorola HT750 Service Manual - Page 86

Transmitter, Specification, VHF/UHF, Receiver

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8-20 Model Chart and Test Specifications Specification Frequency Stability: (-25°C to +55°C, +25° Ref.) Power: Modulation Limiting: FM Hum & Noise: Conducted/Radiated Emission: Adjacent Channel Power: Audio Response: (300 - 3000 Hz) Audio Distortion: Transmitter VHF/UHF ±2.5 ppm VHF: 1-5W UHF: 1-4W ±2.5 @ 12.5 kHz ±4.0 @ 20 kHz ±5.0 @ 25 kHz -40 dB typical -66 dBw -60 dB @ 12.5 kHz -70 dB @ 20/25 kHz +1 to -3 dB 3% Specification Receiver VHF/UHF Frequency Stability: (-25°C to +55°C, +25° Ref.) ±2.5 ppm Sensitivity (12 dB SINAD) EIA: Sensitivity (20 dB SINAD) ETS: .25 µV typical .50 µV typical Intermodulation EIA: 70 dB Adjacent Channel Selectivity: 60 dB @ 12.5 kHz / 70 dB @ 20/25 kHz Spurious Rejection: 70 dB Rated Audio: 0.5W Audio Distortion @ Rated Audio: 3% typical Hum & Noise: -45 dB @ 12.5 kHz -50 dB @ 20/25 kHz Audio Response: (300 - 3000 Hz) +1 to -3 dB Conducted Spurious Emission per FCC Part 15: -57 dBm 1 GHz Specifications subject to change without notice. All electrical specifications and methods refer to EIA/TIA 603 standards. Professional Series radios meet or exceed requirements of MIL STD 810 C, D, E.

Section	Page
Foreword	2
Product Safety and RF Exposure Compliance	2
Computer Software Copyrights	2
Document Copyrights	2
Disclaimer	2
Trademarks	2
Table of Contents	3
Foreword ii	3
List of Figures ix	3
List of Tables xi	3
Introduction 1-1	3
Intrinsically Safe Radio Information 2-1	3
Maintenance 3-1	3
Transceiver Performance Testing 4-1	5
Radio Tuning, Programming, Cloning, Lowband Antenna Cutting Procedure, PassPort Tone Options, and...	5
Power Up Self-Test 6-1	5
Accessories 7-1	6
Model Chart and Test Specifications 8-1	6
Glossary Glossary-1	7
List of Figures	9
List of Tables	11
Chapter 1	13
Introduction	13
1.1 Scope of Manual	13
1.2 Warranty and Service Support	13
1.2.1 Warranty Period and Return Instructions	13
1.2.2 After Warranty Period	13
1.3 Radio Model Information	16
Chapter 2	17
Intrinsically Safe Radio Information	17
2.1 FMRC Approved Equipment	17
2.2 Repair of FMRC Approved Products	18
2.2.1 Repair	18
2.2.2 Relabeling	18
2.2.3 Do Not Substitute Options or Accessories	19
Chapter 3	21
Maintenance	21
3.1 Introduction	21
3.2 Preventive Maintenance	21
3.2.1 Inspection	21
3.2.2 Cleaning Procedures	21
3.3 Safe Handling of CMOS and LDMOS Devices	22
3.4 Repair Procedures and Techniques — General	22
3.5 Disassembling and Reassembling the Radio — General	23
3.6 Detailed Radio Disassembly	24
3.6.1 Front Cover from Chassis Disassembly	24
3.6.2 Chassis Assembly/Disassembly	26
3.6.3 Keypad, Display, and Keypad/PassPort/Option Board Disassembly	26
3.6.4 Speaker, Microphone, and Universal Connector Flex Disassembly	28
3.6.5 PTT Disassembly	29
3.6.6 Control Top Disassembly	29
3.7 Detailed Radio Reassembly	30
3.7.1 Control Top Reassembly	30
3.7.2 PTT Reassembly	30
3.7.3 Speaker, Microphone, and Universal Connector Flex Reassembly	30
3.7.4 Keypad, Display, and Keypad/PassPort/Option Board Reassembly	30
3.7.5 Chassis Assembly Reassembly	31
3.7.6 Chassis and Front Cover Reassembly	31
3.7.7 DTMF Retrofit Kit Procedure (Optional Upgrade Procedure)	32
3.7.8 Option Board Installation	33
3.8 HT750 Radio Exploded Mechanical View and Parts List	37
3.10 Test Equipment	38
3.11 Configuring and Wiring the Programming/Test Cable	39
Chapter 4	41
Transceiver Performance Testing	41
4.1 General	41
4.2 RF Test Mode	41
4.3 Test Frequencies for Display and Non-Display Radios	46
4.4 Receiver Performance Tests	47
Chapter 5	49
Radio Tuning, Programming, Cloning, Lowband Antenna Cutting Procedure, PassPort Tone Options, and...	49
5.1 Introduction	49
5.2 Global Radio Tuning Setup	50
5.2.1 Initial Test Equipment Setup	50
5.3 CPS Programming Setup	51
5.4 Cloning (Conventional and LTR)	51
5.4.1 Error Codes (Display Radios Only)	52
5.5 Cloning (Privacy Plus)	52
5.6 Cloning (PassPort)	53
5.7 Lowband Molded Antenna Cut Chart	54
5.8 HT1250•LS+ PassPort Tone Options	55
5.9 HT1250•LS+ Special Diagnostic Functions	55
Chapter 6	57
Power Up Self-Test	57
6.1 Error Codes - Conventional and LTR Radios	57
6.2 Error Codes - Privacy Plus	58
6.3 Error Codes - PassPort	59
6.4 Operation Display Codes	59
Chapter 7	61
Accessories	61
7.1 HT750/HT1250/HT1250•LS/HT1250•LS+/HT1550•XLS/MTX850/ MTX950/MTX850•LS/MTX8250/MTX9250/MTX8250...	61
7.1.1 Antennas	61
7.1.2 Carrying Accessories	62
7.1.3 Carry Cases	62
7.1.4 Chargers	63
7.1.5 Vehicular Accessories	63
7.1.6 Batteries	63
7.1.7 Adapters	63
7.1.8 Miscellaneous	63
7.1.9 Service Aids	64
7.1.10 Audio Accessories	64
7.1.11 Option Boards* (All option boards below are not compatible with HT1550•XLS)	65
7.1.12 Remote Speaker Microphones	65
7.1.13 Manuals	65
7.1.14 Retrofit Front Cover Kits	65
Chapter 8	67
Model Chart and Test Specifications	67
8.1 UHF 403–470 MHz (Conventional)	67
8.2 UHF 450–512 MHz (Conventional)	68
8.3 UHF 403–470 MHz (LTR and PassPort)	69
8.4 UHF 450–512 MHz (LTR and PassPort)	70
8.5 UHF 403–470 MHz (Conventional/LTR)	71
8.6 UHF 450–512 MHz (Conventional/LTR)	72
8.7 VHF 136–174 MHz	73
8.8 VHF 136–174 MHz (Conventional/LTR)	74
8.9 VHF, 136–174 MHz (LTR & PassPort)	75
8.10 LowBand 29.7–42/35–50 MHz	76
8.11 800 MHz (LTR)	77
8.12 800 MHz (Privacy Plus)	77
8.13 900 MHz (Privacy Plus)	78
8.14 Specifications, HT750 Radio	79
8.15 Specifications, HT1250 Radio	81
8.16 Specifications, HT1250•LS+ Radio	83
8.17 Specifications, HT1550•XLS Radio	85
8.18 Specifications, MTX850/MTX8250 (800 MHz), MTX950/MTX9250 (900 MHz) Radios	87
8.19 Specifications, MTX850•LS and MTX8250•LS (800 MHz) Radios	89

Match case Limit results 1 per page

8-20

Model Chart and Test Specifications

Transmitter

Specification

VHF/UHF

Frequency Stability:

(-25°C to +55°C, +25° Ref.)

±2.5 ppm

Power:

VHF: 1-5W

UHF: 1-4W

Modulation Limiting:

±2.5 @ 12.5 kHz

±4.0 @ 20 kHz

±5.0 @ 25 kHz

FM Hum & Noise:

-40 dB typical

Conducted/Radiated Emission:

-66 dBw

Adjacent Channel Power:

-60 dB @ 12.5 kHz

-70 dB @ 20/25 kHz

Audio Response: (300 - 3000 Hz)

+1 to -3 dB

Audio Distortion:

Receiver

Specification

VHF/UHF

Frequency Stability:

(-25°C to +55°C, +25° Ref.)

±2.5 ppm

Sensitivity (12 dB SINAD) EIA:

Sensitivity (20 dB SINAD) ETS:

.25 μV typical

.50 μV typical

Intermodulation EIA:

70 dB

Adjacent Channel Selectivity:

60 dB @ 12.5 kHz / 70 dB @ 20/25 kHz

Spurious Rejection:

70 dB

Rated Audio:

0.5W

Audio Distortion @ Rated Audio:

3% typical

Hum & Noise:

-45 dB @ 12.5 kHz

-50 dB @ 20/25 kHz

Audio Response: (300 - 3000 Hz)

+1 to -3 dB

Conducted Spurious Emission per FCC Part 15:

-57 dBm <1 GHz

-47 dBm >1 GHz

Specifications subject to change without notice. All electrical specifications and methods refer to EIA/TIA 603 standards. Professional Series radios meet

or exceed requirements of MIL STD 810 C, D, E.