950 - Radiosurplus
High Frequency Single Sideband
Communications Systems
950 specifications
High Frequency Single Sideband
Communications Systems
950 HF SSB transceiver
Transmit frequency range
1.6MHz to 30MHz (continuous)
Receive frequency range
500kHz to 30MHz (continuous)
Power output
125 Watt PEP voice, 100 Watt PEP two tones ±1dB.
Channel capacity
Up to 450 programmable channels (simplex or semi-duplex)
Frequency resolution
10Hz program mode 1Hz tuneable receiver
Frequency stability
Standard ±50Hz (0º to +55ºC)
Optional ±10Hz (-15ºC to +55ºC)
The Barrett 950 transceiver is a state of the art, 125 Watt
HF transceiver designed specifically to satisfy the long
distance communications requirements of government,
private organisations and individuals operating in remote
and rugged environments. Utilising the “free to air” nature
of HF communications spectrum the Barrett 950
transceiver provides remote communications with no
ongoing call charges.
Operating modes
J3E (USB, LSB) - H3E (AM) - J2A (CW) - J2B(AFSK)-optional J2B (AFSK) with narrow filter.
0.25uV (-119dBm) for 10dB SINAD - J3E Mode (With RF pre-amp on)
Audio output
4W into 4 Ohms, 2W into 8 Ohm at less than 5% distortion
Operating temperature
-30ºC to +55ºC
95% relative, non condensing
Current consumption
950 local control
950 remote control
840 mA standby (muted, back-light off)
850 mA standby (muted, back-light off)
Current consumption transmit
Voice average
Two tone
less than 9 Amps typical
less than 15 Amps typical
950 local control model
950 remote control model, main unit
950 remote control model, remote head
950 local control
950 remote control, main unit
950 remote control, remote head
Housed in an extremely strong, corrosion resistant,
custom extruded aluminium chassis, with generous heat
dissipating capabilities, the Barrett 950 will operate in
both voice and high duty cycle data modes in mobile and
fixed stations. The Barrett 950 is built to the specifications
of European Standard ETS 300 373, a standard
developed for the exacting role of international maritime
distress communications, and exceeds the requirements
of Australian land mobile communications standard
245mm x 330mm x 75mm
245mm x 310mm x 75mm
200mm x 65mm x 75mm
In addition to the standard features you would expect in a
professional HF transceiver, the Barrett 950 offers
optional features such as selective calling for simplified
network operation, an internal GPS receiver to enable
vehicle tracking, a voice scrambler module for security
and a FED STD 1045/MIL - STD-188-41A internal fit ALE
Teamed with Barrett’s large range of mobile and base
station antennas, HF data modems and automatic HF
telephone interconnects and even more importantly with
Barrett’s international service backup, the Barrett 950
transceiver will provide long distance voice and data
communications for all environments.
Head Office:
Barrett Communications Pty Ltd P O Box 1214, Bibra Lake WA 6965 AUSTRALIA
Toll Free Tel: 1800 999 580 Tel: (618) 9434 1700 Fax: (618) 9418 6757
email: information@barrettcommunications.com.au
internet: www.barrettcommunications.com.au
European Office:
Barrett Europe Limited 19 Lenten Street Alton, Hampshire GU34 1HG
UNITED KINGDOM Tel: (44) 1420 542254 Fax: (44) 1420 543373
email: information@barretteurope.co.uk
internet: www.barrettcommunications.com.au
Dealer Stamp
Quality System
Certified to
ISO 9002
Registration No. 57114
950 HF SSB transceiver
950 features
Full HF spectrum coverage
Transmit and receive frequency range from 1.6 to 30MHz
Selective call - “Selcall”
Selective call - Selcall - provides a simple and efficient method of
calling stations within a network. With the combined “Selcall Telcall” option fitted - all current derivatives of CCIR 493 format
can be programmed into the 950 transceiver on a channel by
channel basis.
Channel scanning combined with the “Selcall Option” means calls
will always get through, no matter what frequency or channel is
operational due to propagation. Two scan tables are available,
channels can be programmed as members of either table or both.
Emergency selcall with geographical position
The Barrett 950 displays and annunciates emergency selective
calls, also showing the position of the station sending the
emergency call if it is fitted with a GPS receiver.
HF fax and data
With the widespread use of HF as a data transmission medium,
the 950 transceiver is specifically designed for high duty cycle
operation and has as standard an auxiliary connector that is fully
featured to interface to a variety of external modems including the
Barrett 923 fax and data modem.
Selcall mute (quiet line)
When using Selcall scanning this mute only opens when a
selcall is directed to a specific transceiver. This reduces
operator fatigue as the operator is not obliged to listen to
HF noise or traffic not directed to him.
Rack mounting
As with all of the Barrett 900 series HF equipment, a 2RU 19" rack
mount conversion kit is available for the Barrett 950.
450 user configured memory channels
A powerful, channel based, configuration system allowing all
channels to have individual characteristics as follows:Separate transmit and receive frequencies.
BITE - Built In Test Equipment
To enable simple in field diagnostics of suspected faults the BITE
tests receiver performance, selcall operation, syllabic mute
operation, VCO operation and serial communications port
Operation mode - USB-J3E, LSB-J3E, AM-H3E,CW-J2A, AFSK -J2B.
Visual display of channel use.
Direct dial telephone calls
The “Telcall” portion of the “Selcall - Telcall” option provides direct
dial telephone access using a Barrett 660 or 960 HF telephone
interconnect as the interface between HF network and the
telephone network.
Compact size
Measuring 245mm x 330mm x 75mm, the Barrett 950 is the
smallest fully featured commercial synthesised transceiver on the
market today.
ALE - Automatic Link Establishment
The ALE option simplifies the operation of HF networks,
automating many of the procedures necessary to
establish and maintain an HF link. The internally fitted
option is fully interoperable with FED STD 1045 ALE
systems. It is also capable of full 16 digit telephone dialling
(using FED STD 1045 ALE as the signalling medium) with
Barrett 960 ALE equipped telephone interconnects.
125 Watt PEP power output
The transceiver has 125 Watt (PEP) power output in voice mode
on all frequencies.
All mode capability
USB - J3E, LSB - J3E, AM - H3E, CW - J2A and AFSK - J2B.
An optional 500Hz filter is available for CW, SITOR or PACTOR I
and PACTOR II use.
Syllabic mute (squelch)
Only responds to human voice and is immune to noise
burst etc.
Scan table membership - member of scan table one, two or both.
High or low power select
Optional antenna socket selection - two antenna sockets available for selection
on a channel by channel basis.
Selective call format - all common CCIR 493 derivatives in use today can be
Simple functional display
All operational information is easily viewed on a temperature
compensated LCD that has adjustable back-light features for
night operation.
GPS tracking
For position tracking applications, an internally fitted GPS receiver
module or external GPS receiver with NMEA 0183 data output
can provide position information to a 950 transceiver which can
be interrogated from another 950 station using a special selcall
sequence. This, combined with a base station that has a Barrett
977 PC based mapped location package, provides both l o g i s t i c
and safety management of a vehicle or vessel fleet.
A selcall based diagnostic tool that enables interrogation
of remote transceivers to retrieve vital transceiver
operating parameters.
An option that enables a PC connected to the 950 to
send a 32 digit alpha numeric message to any Barrett
transceiver fitted with selcall.
Voice security
When message confidentiality is required a
“scrambler” option is available which provides a
medium level of voice encryption for message privacy
even under the most arduous propagation conditions.
Scan resume - no missed calls
If the transceiver has been left unattended it
automatically returns to scanning and is ready to
receive calls on any channel.
Fully EMC tested to IEC 945 standard
New extruded chassis and circuit design eliminates any spurious
radiation - enables closely co-located operation with VHF and
UHF transceivers, without interference.
Built in antenna VSWR indication
For field staff to check the correct operation of antennas, the tune
function displays antenna forward and reverse power.
Second antenna connector
An optional second antenna connector allows each channel to
select one of two antennas - ideal when long and short distance
antennas are used.
Rugged construction
An extruded aluminium chassis combined with a rugged weather
resistant glass reinforced nylon front panel has been designed to
withstand harsh and hostile environments. Extensive vibration
testing and temperature cycling has proved the Barrett 950 will
operate in the world's toughest environments.
Compact, easy to install remote control head for vehicles
Available in a remote control configuration the 950 is ideal for
installation into today's compact vehicles. In specialised
applications the 950 can be used in a dual control configuration
with both a front panel and a control head.
Transceiver programming
Programming is achieved either using the front panel (depending
on local legislation) or a personal computer loaded with a Barrett
900 series transceiver programming package, connected to the
950 auxiliary socket from the computer’s communications port.
Once one transceiver has been programmed all other
transceivers that are to be used in a network can be “cloned” with
identical data by using a Barrett “cloning” cable plugged between
their auxiliary sockets.
Auxiliary socket
The auxiliary socket provides connection to external HF data
modems, HF telephone interconnect systems and remote control
systems. Commonly used signals available on the auxiliary
connector include - 600 Ohm balanced receive audio output, 600
Ohm balanced transmit audio input, PTT input, scan stop input
from external HF data modems, external position information
input from NMEA 0183 standard GPS receivers and RS-232
Computer control
When fitted with the RS-232 control option the Barrett 950
provides complete control of all transceiver functions via the
9600bps communications port - ideal for use by systems
Tunable receiver
Tunes all frequencies, in all modes, between 500kHz to 30MHz
down to 1Hz steps.
Uses an easy to replace, commonly available, industry standard
Noise blanker
A separate receiver within the 950 generates the noise gating
pulses which gate a new technology high speed switch providing
superior impulse noise blanking performance.
Security function
A built-in function allows a network operator, using a Barrett 950
transceiver, to send a unique coded selective call to “kill” a stolen
transceiver. Once “killed” the transceiver must be unlocked using
a special code sequence.
Transmit time out function
If the transceiver has inadvertently been left in transmit i.e. a
microphone jammed under a seat - after a fixed period of time the
transmitter is disabled. It is re-enabled by pressing the push to talk
button momentarily.
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