BARRETT 900 SERIES TRANSCEIVERS
9.4
Barrett 940 man-pack - P/N BC94001
The Barrett 940 man-pack is technically identical to the Barrett 950 but has the PA set between 10 and
35 W output. In addition it is fitted with the high stability TCXO/DCXO as standard and has a switch
mode regulator fitted to the microprocessor PCB in place of the normal regulators for low power
consumption purposes. A connector transition PCB provides a microphone amplifier for the h a n d s e t
connector and transition from the IDC cable to the military waterproof front panel connectors. The 940 is
constructed in a water resistant case and has a battery pack that clips on the rear of the transceiver. In its
portable form an accessory cover is provided that fits over the front panel when in transit.
The BCA94012 Input Charger Supply is an AC/DC switch-mode power supply that provides a regulated 16V
output from an AC power source of between 90V and 264V.
The BCA94021 NiMH 12V input charge regulator charges the BCA94008 battery with a constant current
source of approximately 2.5A. This source is regulated by U4:A, Q9 and R30. The source is pulsed or
switched off by the battery charge controller U3 using Q5. The current source is pulsed to look for a voltage
drop which indicates the battery is fully charged. The current source is switched off if the battery is fully
charged or a fault condition occurs. A fault condition is where the battery voltage is over 14.7V or under 7.4V
or where battery temperature is over 54C or under -9C. This temperature is measured by a thermistor inside
the battery pack.
The charging section is provided with power from two possible sources. The first is regulated external DC
input of 16V provided, usually, by a charger supply Barrett P/N BCA94012. This input is over-voltage and
reverse voltage protected by a relay. The second is unregulated DC input with an input range between 10.8V
and 15.6V. This is over-voltage, under-voltage and reverse voltage protected by a relay and supplies a
switch mode power supply to provide 16V to the charging section.
9.4.1
940 ancillary components
9.4.1.1 110 to 240 VAC input charger supply Barrett P/N BCA94012
9.4.1.2 Charge regulator suit 13Ah NiMH battery 12V DC input Barrett P/N BCA94021
PAGE 50
Содержание 900 Series
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Страница 72: ...BARRETT 900 SERIES TRANSCEIVERS Microprocessor PCB overlay showing TCXO PAGE 72 ...
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Страница 87: ...BARRETT 900 SERIES TRANSCEIVERS PA PCB overlay PAGE 87 ...
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Страница 89: ...BARRETT 900 SERIES TRANSCEIVERS PA schematic See File PA SCHEMATIC pdf PAGE 89 ...
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Страница 99: ...BARRETT 900 SERIES TRANSCEIVERS Front panel PCB overlay PAGE 99 ...
Страница 100: ...BARRETT 900 SERIES TRANSCEIVERS PAGE 100 Front Panel Schematic 900 Front Panel Schematic Drawing No 900516A1 ...
Страница 103: ...BARRETT 900 SERIES TRANSCEIVERS Remote Control Head PCB overlay PAGE 103 ...
Страница 108: ...BARRETT 900 SERIES TRANSCEIVERS Scrambler PCB overlay PAGE 108 ...
Страница 109: ...BARRETT 900 SERIES TRANSCEIVERS Scrambler Schematic PAGE 109 900 Scrambler Module Schematic 900D54A5 ...
Страница 111: ...BARRETT 900 SERIES TRANSCEIVERS GPS ALE Motherboard Overlay PAGE 111 ...
Страница 112: ...BARRETT 900 SERIES TRANSCEIVERS GPS ALE Motherboard Schematic PAGE 112 900 GPS ALE Schematic ...
Страница 114: ...BARRETT 900 SERIES TRANSCEIVERS 950MR Low Pass Filter Power PCB overlay PAGE 114 ...
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Страница 121: ...BARRETT 900 SERIES TRANSCEIVERS 980PSU DC DC Switch Mode Power Supply PCB Overlay PAGE 121 ...
Страница 133: ...BARRETT 900 SERIES TRANSCEIVERS 900 Hand Microphone Schematic PAGE 133 930 940 950 980 Hand Microphone Schematic ...
Страница 134: ...BARRETT 900 SERIES TRANSCEIVERS 900 Cloning Cable Schematic PAGE 134 930 950 980 Cloning Cable Schematic ...
Страница 139: ...940 Front Metalwork Connection PCB Overlay BARRETT 900 SERIES TRANSCEIVERS PAGE 139 ...
Страница 142: ...BARRETT 900 SERIES TRANSCEIVERS 940 Automatic Antenna Tuner PCB Overlay Barrett P N BCA94009 PAGE 142 ...
Страница 148: ...940 Tuner Front Panel PCB Overlay BARRETT 900 SERIES TRANSCEIVERS PAGE 148 ...
Страница 149: ...940 Tuner Front Panel PCB Schematic BARRETT 900 SERIES TRANSCEIVERS PAGE 149 ...
Страница 153: ...BARRETT 900 SERIES TRANSCEIVERS 940 Charge reg 13Ah 12V DC input PCB overlay Barrett P N BCA94021 PAGE 153 ...
Страница 163: ...BARRETT 900 SERIES TRANSCEIVERS PAGE 163 940 Programming Cable Schematic 940 Transceiver Programming Cable Schematic ...