Aeroflex 2946A Instructions d'exploitation Page 56
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OPERATING MANUAL 2945A
46882-311D 3-17
Tx test (transmitter testing)
Overview
The Communications Service Monitor 2945A has been designed to test the performance of
mobile communication equipment. This section explains the use of the Tx TEST mode. Typical
uses are:-
• Performance checking following manufacture
• Routine quality assurance testing
• Workshop or field fault diagnosis etc.
The tests which need to be carried out will depend on the specification of the transmitter and the
reason for testing, however a generalised list would be:-
Transmitter power
Transmitter frequency
RF distortion
Spurious outputs
Modulation characteristics
Modulation frequency response
Companding/limiting
Modulation distortion
This Service Monitor will perform all of the above tests.
With the Tx TEST mode selected, the screen and menu shown in fold out diagram (2 -0) is
displayed.
Using this screen and menu, the Service Monitor is set up for transmitter testing, and the test
results displayed.
The sections of the monitor available for transmitter testing are: -
The AF generators, used to provide a modulating signal for the transmitter.
The audio tones generator. Used to provide sequential tones for POCSAG and DCS
systems.
The RF power meter.
The RF counter.
The modulation meter, to measure the depth of amplitude modulation or the deviation of
frequency modulation and to recover the modulating signal for other tests. The
demodulated output is fed to the audio amplifier, and can therefore be monitored on the
loudspeaker or on a headset connected to the accessory socket. The SSB option allows
Single Side Band modulation to be demodulated.
The oscilloscope, to examine the wave form of the demodulated signal.
As well as setting up the major sections of the Service Monitor, the following parameters are
selected from the
TRANSMITTER TEST screen:-
The
TRANSMITTER TEST screen allows setting of the following;
IF filter bandwidth.
AF filter pass-band.
De-emphasis filtering.
Distortion measurement methods.
- Operating Manual 1
- COMMUNICATIONS 1
- SERVICE MONITOR 1
- About this manual 4
- About this manual (continued) 5
- Battery usage 8
- Battery storage 9
- GENERAL INFORMATION 10
- Purpose and features 11
- Receiver testing 12
- Duplex testing 13
- Systems testing 14
- Spectrum analyzer 14
- AF testing 15
- Performance data 16
- Audio analyzer 17
- 46882-311D 1-9 18
- Transmitter measurements 19
- Tracking generator 21
- General features 22
- Frequency standard 22
- Options and accessories 23
- Power requirements 24
- Power cords 24
- 1-16 46882-311D 25
- 46882-311D 1-17 26
- INSTALLATION 27
- Ventilation 28
- HARMONISED-WIRE ENDED 29
- North American 30
- Continental Europe 30
- RF and AF connections 32
- Hot Surfaces 32
- Accessory socket connections 32
- Remote control connections 33
- 9-WAY 9-WAY 34
- 9-WAY 25-WAY 34
- Self tests 35
- Using the Service Monitor 36
- Routine maintenance 37
- 2. Earth bonding tests 38
- 3. Insulation tests 38
- 4. Rectification 38
- Cleaning 39
- List of tables 41
- 46882-311D 3-3 42
- About this chapter 43
- Front panel layout 43
- SPECTRUM ANALYZER 44
- Hot surfaces 45
- 46882-311D 3-7 46
- 3-8 46882-311D 47
- Getting started 48
- Test mode screens and menus 48
- HELP/SETUP 49
- Volts, dBm, dBV or Watts and 51
- Bar charts 52
- Using the test modes 54
- TRANSMITTER TEST screen: 56
- 3-18 46882-311D 57
- TRANSMITTER TEST menus 58
- Tx power 59
- TRANSIENT ANALYSIS mode 60
- Audio distortion measurement 62
- Freq. range 10 Hz to 20 kHz 63
- Level range 0.1 mV to 4 V rms 63
- Shape option Sine or square 63
- Stores, Settings/results 64
- Printer 64
- 46882-311D 3-27 66
- 3-28 46882-311D 67
- 46882-311D 3-29 68
- 3-30 46882-311D 69
- Tx FREQ legend 70
- Modulation characteristics 71
- Companding/limiting 71
- *STANDARD OSCILLOSCOPE* 71
- *EXPANDED OSCILLOSCOPE* 71
- *DUPLEX* 72
- Modulation distortion 72
- 3-34 46882-311D 73
- 46882-311D 3-35 74
- Rx test (receiver testing) 75
- ON or OFF 76
- TRANSMIT’ inadvertently 76
- 3-40 46882-311D 79
- AF input level measurement 80
- AF filters 81
- Audio distortion 81
- Making measurements 82
- 3-44 46882-311D 83
- RECEIVER TEST screen 84
- AF bandwidth 85
- AF distortion 85
- Selectivity 86
- Frequency 87
- AGC response 88
- Dx test (duplex testing) 89
- 46882-311D 3-51 90
- 3-54 46882-311D 93
- Tracking generator facility 94
- 3-56 46882-311D 95
- or OFF 95
- Look and Listen 96
- Demod settings 97
- Video filter option OFF ON 98
- Peak hold option OFF ON 98
- mode is the same as for the 98
- Input level measurement 99
- Input filtering 100
- Distortion measurement 100
- *Oscilloscope* 101
- Assigning 102
- 995 Hz 103
- Signal routeing 104
- RF input attenuators 104
- Audio, in the above 105
- OPERATING MANUAL 2945A 106
- 46882-311D 3-67 106
- Tone ON/OFF control 107
- 46882-311D 3-69 108
- Revertive tones 109
- Output level 110
- Tone selection 110
- Tone frequency shift 110
- Overview 110
- Inverted 111
- Tx test DTMF tones function 113
- Rx test DTMF tones function 113
- Formatting a tone sequence 114
- Editing a tone sequence 114
- Tones modulation level 114
- Dx test DTMF tones function 115
- AF test DTMF tones function 115
- Tones ON/OFF control 115
- Mess 2 etc.) 116
- Inverted and Normal 117
- Decoding POCSAG type signals 118
- Oscilloscope 119
- Persistence 120
- Stores, settings/results 121
- DISPLAY HOLD STORE 122
- Other memory functions 122
- Memory card 123
- Accessing the memory cards 124
- ] key to 124
- Write-protecting cards 124
- Coded store protection 125
- Storing on memory cards 126
- Printing from memory cards 126
- Error messages 127
- Real time clock 127
- Date and time stamping 127
- 46882-311D 3-89 128
- Parallel printer port option 129
- 46882-311D 3-91 130
- Setting up 131
- 46882-311D 3-93 132
- LOCAL OPERATION 133
- 3-94 46882-311D 133
- 46882-311D 3-95 134
- 3-96 46882-311D 135
- 46882-311D 3-97 136
- 3-98 46882-311D 137
- 46882-311D 3-99 138
- 3-100 46882-311D 139
- 46882-311D 3-101 140
- 3-102 46882-311D 141
- 46882-311D 3-103 142
- 3-104 46882-311D 143
- 46882-311D 3-105 144
- 3-106 46882-311D 145
- TECHNICAL DESCRIPTION 146
- The display 148
- Replace this A4 page with an 150
- A3 page of the same number 150
- Tx test mode 152
- Data generator 153
- Receiver circuits 154
- IF circuits 155
- Demodulators 156
- Rx test mode 157
- RF generator 158
- Modulators 158
- RF amplifier 158
- Audio generators 158
- Modulation control 158
- Dx test mode 159
- Spectrum analyzer mode 159
- AF test mode 160
- Systems mode 160
- 46882-311D 4-5 161
- 4-6 46882-311D 162
- ACCEPTANCE TESTING 163
- Introduction 164
- Test equipment 165
- RF output tests 166
- RF output level 167
- Measuring 168
- Amplitude modulation 172
- Modulation meter 173
- AF output tests 175
- Audio generator distortion 176
- Audio generator frequency 176
- AF input tests 177
- Audio voltmeter 178
- Audio oscilloscope 179
- LF generator 180
- RF input tests 181
- Signal generator 182
- Modulation analyzer - AM 184
- RF frequency meter 186
- RF spectrum analyzer 187
- RF broad band power meter 189
- Options if fitted 191
- 46882-311D 5-31 193
- 5-32 46882-311D 194
- 5-34 46882-311D 196
- 46882-311D 5-35 197
- 46882-311D 5-37 199
- 5-38 46882-311D 200
- 46882-311D 5-39 201
- DIRECTIONAL POWER HEADS 208
- Precautions 209
- Précautions 210
- Vorsichtsmaßnahmen 211
- Precauzioni 212
- Precauciones 213
- Features 214
- A-8 46882-311D 215
- 46882-311D A-9 216
- Power measurement 217
- MAX SAFE POWER 218
- A-12 46882-311D 219
- Supplied 220
- Optional 220
- Power supply 221
- Procedure 221
- Technical description 223
- 46882-311D A-17 224
- Appendix B 225
- Contents 225
- List of figures 225
- Dimensions and weight 232
- Part numbers 232
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