Barret 975 Catalog

High Frequency Single Sideband

975 1000 Watt HF Transmitter

The Barrett 1000 Watt HF SSB Transmitter is a compact
rack mounted unit developed for base applications in large
HF networks. The transmitter comes as a complete
package with exciter, power supply, RF power amplifier,
interconnect cables and all rack mount hardware.
Optionally, it can be supplied with a Barrett remote site
controller for remote siteoperation. The exciter is a Barrett
950 Transceiver with 450 channel capacity and all mode
capability. The RF power amplifier consists of two
separate push pull broadband amplifier plug-in modules
and a combiner. The amplifiers are mounted on each side
of the module on large heatsinks. A fan is mounted on the
rear of the module and is activated by separate
thermostats on each heatsink. The combinedoutputof the
two modules passes through the high performance
harmonic filters and a VSWR bridge which supplies the
ALC voltage to control the exciter drive level. No tuning
adjustments are required and a special circuit detects
severe mismatches and turns the amplifier off. Two panel
meters monitor the collector currents to each module and
immediately detect unbalance or faults. A separate meter
measures power output. The PS1000B Power Supply
uses a "constant-voltage" ferroresonant transformer
which provides a high- reliability DC power source that is
self-protecting against overloads.

Communications Systems

Consists of:

Barrett 950 Local Control HF Transceiver
Barrett 922 Power Supply Unit
TW1000B Linear Amplifier
Cable (control) transceiver to linear
Cable (coaxial) transceiver to linear
Fan option to suit Barrett 950 (BCA90007)
Fan option to suit Barrett 922 (BCA90007)
Rack mounting kit suit Barrett 950 (BCA90010)
Rack mounting kit suit Barrett 922 (BCA90010)
Rack mounting tray to suit TW1000B
39U 19" rack cabinet for floor mounting or;
18U 19" rack unit for desk mounting
19" Blanking panels and hardware

All solid state
Built-in 115/230V AC power supply
Instantaneous frequency changes
No tuning adjustments
Broadband 1.6-30MHz
Meets CCIR specifications

Technical Specifications:

Frequency Range 2 - 30MHz Broadband, (1.6-2MHz

at reduced harmonic specifications)

Power Output 1000 Watt PEP SSB, 1000 Watt

Avg. FSK, CW
Duty Cycle Continuous transmit
Intermodulation Distortion -30dB typical
Harmonics and Spurious -60dB
Output Impedance 50 Ohms < 2:1 VSWR
Primary Voltage 115/230V AC 10%

(jumper selectable)
Primary Current 14A (230 V)

26A (115V)
Frequency 50Hz/60Hz (jumper selectable)
Weight 190kg
Size 1875(h) x 610(w) x 700(d) cm

±

BCB97500/3

Quality System
Certified to
ISO .9002
Registration No. 57114

High Frequency Single Sideband

975 500 Watt HF Transmitter

The Barrett 500 Watt HF SSB Transmitter is a compact
rack mounted unit developed for base applications in large
HF networks. The transmitter comes in either an 18U rack
mount cabinet for desk mounting or a 39U rack cabinet for
floor mounting. The transmitter comes as a complete
package with exciter, power supply, RF power amplifier,
interconnect cables and all rack mount hardware.
Optionally, it can be supplied with a Barrett remote site
controller for remote siteoperation. The exciter is a Barrett
950 Transceiver with 450 channel capacity and all mode
capability. The 500W RF power amplifier is of solid state
broadband design and has a built-in AC power supply.

Consists of:

Barrett 950 Local Control HF Transceiver
Barrett 922 Power Supply Unit
TW500B Linear Amplifier
Cable (control) transceiver to linear
Cable (coaxial) transceiver to linear
Fan option to suit Barrett 950 (BCA90007)
Fan option to suit Barrett 922 (BCA90007)
Rack mounting kit suit Barrett 950 (BCA90010)
Rack mounting kit suit Barrett 922 (BCA90010)
Rack mounting tray to suit TW500B
39U 19" rack cabinet for floor mounting or;
18U 19" rack unit for desk mounting
19" Blanking panels and hardware

Communications Systems

All solid state
Built-in 115/230V AC power supply
Instantaneous frequency changes
No tuning adjustments
Broadband 1.6-30MHz
Meets CCIR specifications

BCB97500/3

Head Office:

Barrett Communications Pty Ltd P O Box 1214, Bibra Lake WA 6965 AUSTRALIA
Toll Free Tel: [phone] Tel: [phone] Fax: [phone]
email: [email protected]
internet: www.barrettcommunications.com.au

European Office:

Barrett Europe Limited 19 Lenten Street Alton, Hampshire GU34 1HG
UNITED KINGDOM Tel: [phone] Fax: [phone]
email: [email protected]
internet: www.barrettcommunications.com.au

Technical Specifications:

Frequency Range 2-30MHz (1.6-2MHz with reduced

Power output 500W PEP Minimum, 500-600W

Duty Cycle Continuous transmit
Intermodulation distortion - 30dB typical
Harmonics and spurious - 43dB 50
Output impedance 50 Ohms <2:1 VSWR
Primary Voltage 115/230V AC 10% (jumper

Primary current 14A (230V)

Frequency 50Hz/60Hz (jumper selectable)
Weight 120kg
Size 950(h) x 610(w) x 700(d) cm

harmonic specifications)

PEP Typical

±

selectable)

26A (115V)

Dealer Stamp