Barrett 900 Series Manuale utente
Technical manual
Barrett 900 series HF transceivers and receivers
BARRETT 930, 950, 980 local control HF transceivers
BARRETT 930, 950 remote control ( trunk mount) HF transceivers
BARRETT 950M HF transceiver module
BARRETT 950MR HF receiver
BARRETT 940 HF portable transceiver
BARRETT COMMUNICATIONS©
© Barrett Communications
BCM90000/4
:
Barrett Communications Pty Ltd Barrett Europe Limited
10 Port Kembla Drive, Bibra Lake WA 6163 19 Lenten Street
P O Box 1214, Bibra Lake WA 6965 Alton, Hampshire
AUSTRALIA GU34 1HG
Toll Free Tel: 1800 999 570 UNITED KINGDOM
Tel: (61-8) 9 434 1700 Tel: (44) 1420 542254
Fax: (61-8) 9 418 6757 Fax: (44) 1420 54337, P3
Head office: European office
PAGE 1
BARRETT 900 SERIES TRANSCEIVERS
1.0 Specifications ... ............ ............ ............ ............ ............ ............ ............ ............ ............ ............5
1.1 General Specifications... ............ ............ ............ ............ ............ ............ ............ ............5
1.2 Receiver Specifications . ............ ............ ............ ............ ............ ............ ............ ............7
1.3 Transmitter Specifications .......... ............ ............ ............ ............ ............ ............ ............8
2.0 Introduction....... ............ ............ ............ ............ ............ ............ ............ ............ ............ ............9
3.0 Overview .......... ............ ............ ............ ............ ............ ............ ............ ............ ............ ............11
3.1 Front Panel ....... ............ ............ ............ ............ ............ ............ ............ ............ ............11
3.2 Microprocessor PCB...... ............ ............ ............ ............ ............ ............ ............ ............11
3.3 RF/Audio PCB .. ............ ............ ............ ............ ............ ............ ............ ............ ............11
3.4 PA PCB ............ ............ ............ ............ ............ ............ ............ ............ ............ ............12
3.5 Remote Control Head .... ............ ............ ............ ............ ............ ............ ............ ............12
3.6 940 front panel .. ............ ............ ............ ............ ............ ............ ............ ............ ............12
3.7 940 connector transition PCB...... ............ ............ ............ ............ ............ ............ ............12
4.0 Technical description ..... ............ ............ ............ ............ ............ ............ ............ ............ ............13
4.1 Microprocessor PCB...... ............ ............ ............ ............ ............ ............ ............ ............13
4.1.2 Power supplies . ............ ............ ............ ............ ............ ............ ............ ............13
4.1.3 Reference oscillator (Standard) .. ............ ............ ............ ............ ............ ............13
4.1.4 Reference oscillator (High stability option) ............ ............ ............ ............ ............13
4.1.5 Microprocessor. ............ ............ ............ ............ ............ ............ ............ ............13
4.1.6 DDFS and VCO. ............ ............ ............ ............ ............ ............ ............ ............15
4.1.7 Selcall (if enabled).......... ............ ............ ............ ............ ............ ............ ............17
4.1.8 Audio mute........ ............ ............ ............ ............ ............ ............ ............ ............17
4.1.9 PA ALC control voltage PWR ADJ ............ ............ ............ ............ ............ ............18
4.2 RF / Audio PCB . ............ ............ ............ ............ ............ ............ ............ ............ ............19
4.2.1 RF section......... ............ ............ ............ ............ ............ ............ ............ ............19
4.2.1.1 .30 MHz Low pass filter, first mixer and 45 MHz IF amplifier.. ............ ............19
4.2.1.2 .Second mixer and bandpass crystal filter.. ............ ............ ............ ............21
4.2.1.3 .Noise blanker.... ............ ............ ............ ............ ............ ............ ............21
4.2.1.4 .Noise gate......... ............ ............ ............ ............ ............ ............ ............21
4.2.1.5 .Second IF, AGC and demodulator ............ ............ ............ ............ ............21
4.2.1.6 .Transmit and receive switching ... ............ ............ ............ ............ ............21
4.2.2 Audio section .... ............ ............ ............ ............ ............ ............ ............ ............21
4.2.2.1 .Audio path......... ............ ............ ............ ............ ............ ............ ............22
4.3 PA PCB ............ ............ ............ ............ ............ ............ ............ ............ ............ ............24
4.3.1 Gain control amp............ ............ ............ ............ ............ ............ ............ ............24
4.3.2 Low pass filters . ............ ............ ............ ............ ............ ............ ............ ............24
4.3.3 ALC control ....... ............ ............ ............ ............ ............ ............ ............ ............24
4.3.4 Over-voltage and reverse voltage protection......... ............ ............ ............ ............24
4.3.5 Auxiliary antenna socket ............ ............ ............ ............ ............ ............ ............24
4.3.6 Receiver RF amplifier..... ............ ............ ............ ............ ............ ............ ............24
4.3.7 Power supply regulators. ............ ............ ............ ............ ............ ............ ............24
4.4 Front panel........ ............ ............ ............ ............ ............ ............ ............ ............ ............26
4.4.1 LCD and status LED's .... ............ ............ ............ ............ ............ ............ ............26
4.4.2 Keypad ............ ............ ............ ............ ............ ............ ............ ............ ............26
4.4.3 Backlighting ...... ............ ............ ............ ............ ............ ............ ............ ............26
4.4.4 Microphone....... ............ ............ ............ ............ ............ ............ ............ ............26
4.4.5 Volume control and On/Off switch ............ ............ ............ ............ ............ ............26
5.0 Maintenance..... ............ ............ ............ ............ ............ ............ ............ ............ ............ ............30
5.1 Introduction....... ............ ............ ............ ............ ............ ............ ............ ............ ............30
5.2 Printed Circuit Board (PCB) maintenance ............ ............ ............ ............ ............ ............30
5.3 Component replacement ............ ............ ............ ............ ............ ............ ............ ............30
5.4 CMOS devices.. ............ ............ ............ ............ ............ ............ ............ ............ ............31
5.5 Transmitter power amplifier maintenance precautions ....... ............ ............ ............ ............31
5.6 PCB access ...... ............ ............ ............ ............ ............ ............ ............ ............ ............31
5.6.1 930 - 950 - 980 transceivers......... ............ ............ ............ ............ ............ ............31
5.6.2 940 transceivers ............ ............ ............ ............ ............ ............ ............ ............31
5.6.3 930 - 950 remote control head ..... ............ ............ ............ ............ ............ ............31
4.5 Remote control head...... ............ ............ ............ ............ ............ ............ ............ ............28
BARRETT 900 SERIES TRANSCEIVERS
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5.7 Fault diagnosis.. ............ ............ ............ ............ ............ ............ ............ ............ ............32
5.7.1 General ............ ............ ............ ............ ............ ............ ............ ............ ............32
5.7.2 Transceiver will not power up ...... ............ ............ ............ ............ ............ ............33
5.7.3 Transceiver will not receive but displays OK .......... ............ ............ ............ ............35
5.7.3.1 No receiver noise at all ... ............ ............ ............ ............ ............ ............35
5.7.3.2 Receive noise present, but does not receive.......... ............ ............ ............35
5.7.3.4 Transceiver turns on but displays "Barrett 900 Transceiver" only. .... ............35
5.7.4 Transceiver turns on, internal voltages are normal, but no LCD display......... ............36
5.7.5 Main microprocessor faults ......... ............ ............ ............ ............ ............ ............36
5.7.6 VCO faults ........ ............ ............ ............ ............ ............ ............ ............ ............37
5.7.7 Transmitter faulty ........... ............ ............ ............ ............ ............ ............ ............37
5.7.8 Replacement of PA output and driver transistors ... ............ ............ ............ ............38
5.8 Adjustments...... ............ ............ ............ ............ ............ ............ ............ ............ ............40
5.8.1 Front panel........ ............ ............ ............ ............ ............ ............ ............ ............40
5.8.2 Microprocessor PCB...... ............ ............ ............ ............ ............ ............ ............40
5.8.2.1 Reference oscillator setup (Standard oscillator) .... ............ ............ ............40
5.8.2.2 Reference oscillator setup (High stability oscillator)............ ............ ............40
5.8.2.3 VCO frequency adjustment......... ............ ............ ............ ............ ............40
5.8.2.4 Carrier Insertion oscillator peaking........... ............ ............ ............ ............40
5.8.2.5 VCO Low pass filter........ ............ ............ ............ ............ ............ ............40
5.8.2.6 DAC Low pass filter ........ ............ ............ ............ ............ ............ ............41
5.8.3 RF/ Audio PCB.. ............ ............ ............ ............ ............ ............ ............ ............41
5.8.3.1 Input low pass filter......... ............ ............ ............ ............ ............ ............41
5.8.3.2 45MHz IF Filter.. ............ ............ ............ ............ ............ ............ ............41
5.8.3.3 IF Inductors....... ............ ............ ............ ............ ............ ............ ............42
5.8.3.4 Noise blanker potentiometer ....... ............ ............ ............ ............ ............42
5.8.3.5 Carrier rejection potentiometer.... ............ ............ ............ ............ ............42
5.8.3.6 Transmit drive level set potentiometer ...... ............ ............ ............ ............42
5.8.3.7 455Khz IF ......... ............ ............ ............ ............ ............ ............ ............42
5.8.4 PA PCB ............ ............ ............ ............ ............ ............ ............ ............ ............42
5.8.4.1 Driver bias setup ............ ............ ............ ............ ............ ............ ............42
5.8.4.2 PA bias setup .... ............ ............ ............ ............ ............ ............ ............42
5.8.4.3 Power level adjustment .. ............ ............ ............ ............ ............ ............43
5.3.4.4 Programmable links ....... ............ ............ ............ ............ ............ ............43
6.0 Software programming and options ......... ............ ............ ............ ............ ............ ............ ............44
6.1 Barrett 930 transceivers . ............ ............ ............ ............ ............ ............ ............ ............44
6.2 Barrett 940 transceivers . ............ ............ ............ ............ ............ ............ ............ ............44
6.3 Barrett 950 transceivers . ............ ............ ............ ............ ............ ............ ............ ............44
6.4 Barrett 980 transceivers . ............ ............ ............ ............ ............ ............ ............ ............44
7.0 Internal jumper settings ............ ............ ............ ............ ............ ............ ............ ............ ............45
7.1 Standard jumpers locations ........ ............ ............ ............ ............ ............ ............ ............45
7.2 Configuring antenna connectors . ............ ............ ............ ............ ............ ............ ............45
8.0 Internal options ............ ............ ............ ............ ............ ............ ............ ............ ............ ............46
8.1 Internal scrambler option ............ ............ ............ ............ ............ ............ ............ ............46
8.2 Internal GPS receiver option ....... ............ ............ ............ ............ ............ ............ ............48
8.3 Internal ALE option P/N BCA95001 and BCA95002 ........... ............ ............ ............ ............48
9.0 Features and configurations unique to transceiver models . ............ ............ ............ ............ ............49
9.1 Barrett 950 transceivers fitted with high stability option - P/N BC95001 and BC95003 ............49
9.2 Barrett 950M transceiver module - P/N BC95004 .. ............ ............ ............ ............ ............49
9.3 Barrett 950MR receivers ............ ............ ............ ............ ............ ............ ............ ............49
9.4 Barrett 940 man-pack..... ............ ............ ............ ............ ............ ............ ............ ............50
9.4.1 940 ancillary components ........... ............ ............ ............ ............ ............ ............50
9.4.1.1 110 to 240 VAC input charger supply Barrett P/N BCA94012 ........... ............50
9.4.1.2 Charge regulator suit 13Ah NiMH battery 12V DC input P/N BCA94021 ...50
9.4.1.3 940 multiple-use distribution unit Barrett P/N BCA94010.... ............ ............51
9.4.1.4 940 automatic antenna tuner....... ............ ............ ............ ............ ............51
9.5 Barrett 980 GMDSS transceiver .. ............ ............ ............ ............ ............ ............ ............52
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BARRETT 900 SERIES TRANSCEIVERS
10.0 Accessory interface unit - P/N BCA90016 ............ ............ ............ ............ ............ ............ ............53
11.0 Auxiliary connector ........ ............ ............ ............ ............ ............ ............ ............ ............ ............54
11.1 Barrett 980 and Barrett 950 transceivers .. ............ ............ ............ ............ ............ ............54
11.2 Barrett 930 transceivers . ............ ............ ............ ............ ............ ............ ............ ............55
11.3 Barrett 940 manpack transceivers............ ............ ............ ............ ............ ............ ............56
12.0 Circuit diagrams, overlays and parts lists.. ............ ............ ............ ............ ............ ............ ............57
Active component outlines .......... ............ ............ ............ ............ ............ ............ ............ ............57
RF/Audio PCB overlay ... ............ ............ ............ ............ ............ ............ ............ ............ ............58
RF/Audio schematic....... ............ ............ ............ ............ ............ ............ ............ ............ ............59
RF/Audio parts List - showing optional narrow filter components. .... ............ ............ ............ ............61
Microprocessor PCB overlay....... ............ ............ ............ ............ ............ ............ ............ ............72
Microprocessor schematic .......... ............ ............ ............ ............ ............ ............ ............ ............73
Microprocessor parts list ............ ............ ............ ............ ............ ............ ............ ............ ............75
PA PCB overlay. ............ ............ ............ ............ ............ ............ ............ ............ ............ ............87
PA schematic .... ............ ............ ............ ............ ............ ............ ............ ............ ............ ............89
PA parts list ....... ............ ............ ............ ............ ............ ............ ............ ............ ............ ............91
Front panel PCB overlay ............ ............ ............ ............ ............ ............ ............ ............ ............99
Front panel schematic.... ............ ............ ............ ............ ............ ............ ............ ............ ............100
Front panel parts list ....... ............ ............ ............ ............ ............ ............ ............ ............ ............101
Remote control head PCB overlay ........... ............ ............ ............ ............ ............ ............ ............103
Remote control head schematic .. ............ ............ ............ ............ ............ ............ ............ ............104
Remote control head parts list ..... ............ ............ ............ ............ ............ ............ ............ ............105
Scrambler PCB overlay Barrett P/N BCA94031 ... ............ ............ ............ ............ ............ ............108
Scrambler schematic ..... ............ ............ ............ ............ ............ ............ ............ ............ ............109
Scrambler parts list ........ ............ ............ ............ ............ ............ ............ ............ ............ ............110
GPS/ALE motherboard overlay... ............ ............ ............ ............ ............ ............ ............ ............111
GPS/ALE motherboard schematic ........... ............ ............ ............ ............ ............ ............ ............112
GPS/ALE motherboard parts list . ............ ............ ............ ............ ............ ............ ............ ............113
950MR Low Pass Filter/Power PCB overlay.......... ............ ............ ............ ............ ............ ............114
950MR Low Pass Filter/Power PCB schematic ..... ............ ............ ............ ............ ............ ............115
950MR Low Pass Filter/Power PCB parts list ........ ............ ............ ............ ............ ............ ............117
980PSU DC/DC switch mode power supply PCB overlay ... ............ ............ ............ ............ ...........121
980PSU DC/DC switch mode power supply schematic ...... ............ ............ ............ ............ ............122
980PSU DC/DC switch mode power supply parts list.......... ............ ............ ............ ............ ............123
900 series final assembly parts lists.......... ............ ............ ............ ............ ............ ............ ............125
930, 940, 950, 980 hand microphone schematic.... ............Barrett P/N BCA90003 ... ............ ............133
930, 950, 980 cloning cable schematic ..... ............ ............Barrett P/N BCA90024 ... ............ ............134
930, 950, 980 programming cable schematic ........ ............Barrett P/N BCA90023 ... ............ ............135
940 chassis explosion diagram ... ............ ............ ............ ............ ............ ............ ............ ............136
940 connector transition PCB overlay ...... ............ ............ ............ ............ ............ ............ ............139
940 connector transition schematic.......... ............ ............ ............ ............ ............ ............ ............140
940 connector transition parts list ............ ............ ............ ............ ............ ............ ............ ............141
940 automatic antenna tuner PCB overlay ............ ............Barrett P/N BCA94009 ... ............ ............142
940 automatic antenna tuner ... ............ ............Barrett P/N BCA94009 ... ............ ............143
940 auto tuner PCB parts list.......... .......... ............ ............ ............ ............ ............ ............ ............146
940 multiple-use distribution unit schematic .......... ............Barrett P/N BCA94010 ... ............ ............151
940 multiple-use distribution unit parts list ............ ............Barrett P/N BCA94010 ... ............ ............152
940 charge reg. 13Ah / 12V DC input PCB overlay. ............Barrett P/N BCA94021 ... ............ ............153
940 charge reg. 13Ah / 12V DC input PCB schematic .........Barrett P/N BCA94021 ... ............ ............154
940 battery charger PCB parts list ............ ............ ............Barrett P/N BCA94021 ... ............ ............157
940 handset lightweight tactical schematic............ ............Barrett P/N BCA94004 ... ............ ............161
940 transceiver mic schematic ............ ............ ............Barrett P/N BCA94013 ... ............ ............162
940 programming cable schematic .......... ............ ............Barrett P/N BCA94013 ... ............ ............163
940 final assembly parts list......... ............ ............ ............ ............ ............ ............ ............ ............137
schematic
940 automatic antenna tuner final assembly parts list (Drab Olive, Periwinkle) .......... ............ ............147
940 tuner front panel PCB overlay ............ ............ ............ ............ ............ ............ ............ ............148
940 tuner front panel PCB schematic ....... ............ ............ ............ ............ ............ ............ ............149
940 ATU front panel PCB parts list............ ............ ............ ............ ............ ............ ............ ............150
940 transceiver cloning cable schematic .. ............ ............Barrett P/N BCA94014 ... ............ ............160
BARRETT 900 SERIES TRANSCEIVERS
PAGE 4
1.0 Specifications
BARRETT 980
BARRETT 950 BARRETT
930 BARRETT 950M
BARRETT 950MR
BARRETT 940
930, 940, 950
980
930, 950
930, 950
980
940
980
1.1 General Specifications
Equipment GMDSS transceiver.
transceiver local and remote control models
transceiver local and remote control models
transceiver module
receiver module (disregard references to transmit
specifications and descriptions)
man-pack transceiver (power output limited to 10 - 35 W
(adjustable))
Transmit frequency range 1.6 MHz to 30 MHz (continuous)
Receive frequency range 500 kHz to 30 MHz (continuous)
Channel capacity 980 local and remote control models, 950 local and remote control
models, 950R and 950MR1 receivers and - Up to
450 programmable channels (simplex or semi-duplex)
930 local and remote control models - Up to 20 programmable channels
(simplex or semi-duplex)
Frequency resolution 10 Hz program mode
1 Hz tuneable receiver (940, 950 and 980 transceivers)
Frequency stability Standard ±50 Hz (0 to +55 C)
Optional ±10 Hz (-15 C to +55 C)(Standard 980)
Intermediate frequencies 45 MHz and 455 kHz (double conversion)
Operating modes J3E (USB, LSB)
H3E (AM)
J2A (CW)
J2B (AFSK) standard filter (980, 950 local and remote control models
only)
J2B (AFSK) narrow filter option (980, 950 local and remote control models
only)
Operating temperature -30 C to +55 C
Humidity 95% relative, non condensing
Display system Supertwist backlit LCD matrix, 16 character x 2 line
Controls 20 key keypad (illuminated), analogue power/volume
Supply voltage - 13.8 VDC + 20% / - 10% (negative ground)
Polarity protected. Over voltage protected
- 24 VDC +20% / -10% galvanically isolated from transceiver (using
matching, switch mode power supply)
Current consumption local control models 840 mA receive
receive. remote control models 860 mA receive
(24V) 450 mA receive
595 mA receive
Antenna Impedance 50 unbalanced
Compass Safe Distance GMDSS transceiver 2 metres
940 man-pack model
°°
°°
°°
W
BARRETT 900 SERIES TRANSCEIVERS
PAGE 5
Weight 3.6 Kg.
3.2Kg.
portable transceiver 3.9 Kg.
13 Ah NiMH battery pack 2.7 Kg
automatic antenna tuner 1.8 Kg.
Dimensions 250 mm x 75 mm x 300 mm
transceiver - no battery 275 mm x 97 mm x 210 mm
transceiver and battery 275 mm x 97 mm x 310 mm
transceiver, battery and top case 275 mm x 97mm x 405mm
automatic antenna tuner 275 mm x 53 mm x 210 mm
Selcall System Based on CCIR 493-4
Scan Types Selcall, Voice(syllabic), AGC derived signal level.
Scan Channels Two tables, programmable by channel.
Scan Rate Selcall Scan - Fixed at 500 ms.
Non Selcall scan - Adjustable from 100 ms to 5 secs
930, 950 and 980
950MR1
940
940
Optional 940
930 - 950 - 980
940
940
940
Optional 940
.
BARRETT 900 SERIES TRANSCEIVERS
PAGE 6
1.2 Receiver Specifications
Sensitivity 0.256uV (-119dBm) for 10dB SINAD - J3E Mode (With RF pre-amp on)
Selectivity J3E -1kHz and + 4kHz better than 60dB
Selectivity F1B (optional) -500Hz and + 500Hz better than 45dB
Desensitisation -1kHz and + 4kHz better than 60dB
-10kHz and +10kHz better than 71dB
-20kHz and +20kHz better than 80dB
-50kHz and +50kHz better than 87dB
The level of an unwanted signal above the level of a wanted signal that will
reduce the SINAD of the wanted signal producing 10dB SINAD to 7dB
SINAD
Image rejection Better than 76dB
Spurious response ratio Better than 70dB
Cross modulation -20kHz and +20kHz better than 82dB
The level of an unwanted signal that is 30% AM modulated and at
20kHz above the level of a wanted signal that is producing 10dB SINAD
that will cause this wanted signal SINAD to reduce by 3dB
Blocking -20kHz and +20kHz better than 80dB
The level of an unwanted signal above the level of a wanted signal that will
reduce the SINAD of the wanted signal producing 10dB SINAD to 7dB
SINAD
Intermodulation 85dB - the level of an unwanted signal in relation to a wanted signal.
Inband IMD Greater than 34dB
Clarifier range Receive only 1Hz steps up to ±1kHz (dependant on configuration).
AGC efficiency Less than 6.0 dB variation with an input signal of 6uV(-91.4dBm) to
3V(+22.5dBm).
Audio Output 4W into 4 Ohms, 2W into 8 Ohms at less than 5% distortion
Audio output impedance 2 to 80 Ohms
Audio response Less than 6dB variation from 350Hz to 2750Hz
Audio distortion Less than 5% at rated power J3E mode
Input protection Better than 30V RMS from a 50 ohm source
BARRETT 900 SERIES TRANSCEIVERS
PAGE 7
930 - 950
980
940
930, 950,980
940
930, 950, 980
940
1.3 Transmitter Specifications
RF Output Power 100 W PEP two tone ± 1 dB
125 W PEP voice ± 1 dB
or
10 W PEP two tone ± 1 dB
12 W PEP voice ± 1 dB
100 W PEP two tone ±1.5 dB
(portable) 25 W two tone 10 - 35 W PEP (factory set to user
requirement)
Duty Cycle 100% two-tone input signal with fan option
(portable) 25% voice duty cycle
Protection Safe under all load conditions, thermal protection against excessive power
transistor temperatures.
Sideband suppression Better than -65dB below PEP
Harmonic suppression Better than -60dB below PEP
Carrier suppression Better than -60dB below PEP
Spurious emission Better than -60dB below PEP
Intermodulation products Better than -31dB below PEP (25dB below two tone peak)
Audio frequency response Less than 6 dB variation 350 Hz to 2750 Hz
Current consumption Voice average less than 9Amps typical
Two tone less than 15Amps typical
Voice average less than 5Amps typical.
Two tone less than 9Amps typical.
BARRETT 900 SERIES TRANSCEIVERS
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BARRETT 900 SERIES TRANSCEIVERS
2.0 Introduction
This technical manual covers the Barrett 950 local and remote control transceiver, the Barrett 980 GMDSS
transceiver, the Barrett 940 man-pack transceiver, the Barrett 930 local and remote control transceiver, the
Barrett 950M transceiver module and the 950MR receivers. They have largely identical hardware and only
vary by key function and operational software and in the case of the 940 the mounting hardware and
enclosure.
PAGE 9
BARRETT 900 SERIES TRANSCEIVERS
PAGE 10
BARRETT 900
DRAWING NUMBER DATE ECN REFERENCE
BARRETT PART NO
DIMENSIONING
SCALE
NTS
DRAWN
DRAWING TITLE
DESIGNED SHEET
1OF1
DJS (PE)
900B64A3.PCB 25-1-99
PMW
SYSTEM BLOCK DIAGRAM
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1
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7
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