Datron TW-100 brochure

100Hz INCREMENTAL

TUNING

SELECTIVE CALLING AND

TRANSCALL (ADAPTIVE) OPTIONS

FULL REMOTE

CONTROL OPTION

NOISE IMMUNE SQUELCH

The TRANSWORLD TW100 is an advanced synthesized HF transceiver covering the entire HF frequency range from

1.6 to 30M Hz. The TW100 provides voice operation in the single sideband mode, radioteletype with the optional
modem, and telegraphy. The transceiver is controlled by a microprocessor which provides the ultimate in operating
flexibility with featu res such as 100 memory channels, continuous tuning, separate transmit and receive frequencies
for half-duplex operation and channel scanning. The transceiver is controlled by a keypad and the channel number
and frequency are shown on a large liquid crystal display. A special version, model TW100SX, is available which only
displays channel numbers and requires an external channel programming/reprogramming unit.

The TW1 00 Series offers a wide range of options and accessories to provide advanced systems capabilities. Built-in
options include full Remote Control Capability, Selective Calling and the TRANSCALL Adaptive System The
TRANSCALL system makes HF operation as simple as using a telephone. The operator simply "dials" the number

(actually a three digit entry on the keypad) and presses the CALL button. The transceiver then automatically links up
with the station being called and they together select the best available channel. When the connection is made, a
telephone-type ringing signal alerts both stations. Additional accessory items include Antenna Tuners, Broadband
Antennas, RTTY/FSK Modems and Linear Amplifiers.

MICROPROCESSOR CONTROL

A high performance microprocessor

is used to control the synthesizer in
the TW100. The inputs from the front
panel keypad control the selection of
the channel frequencies stored in the

memory and permit the entry of new
frequencies on the free tuning
channel. The microprocessor also
controls the large easily read Liquid
Crystal Display which can be used to
show both channel and frequency

information. The use of the
microprocessor provides great

flexibility of control combined with
simple operation and programming.

CIRCUITRY

The TW100 uses all solid state,
broadband cirquitry which eliminates'
all field adjustments and tuning. An
upconversion design to the first IF at

75MHz, places images and spurious

responses in the VHF range, where

they are removed by simple low pass
filters. The transmitter spectral purity
is ensured by six 10-pole elliptical
function filters selected by the channel
switch. The second IF is at 1650kHz
where the main selectively is provided
by high performance 6-pole crystal
filters. The receiver uses a high quality
packaged diode balanced mixer with
an intercept point of

+11 dBm. This

gives the receiver exceptional dynamic
range and freedom from

intermodulation and overload. The
frequency control system is derived

from one stable 5120kHz reference
oscillator. A 10kHz phase locked loop

covers 76.6 to 105MHz for the first
conversion oscillator. The second

100Hz phase locked loop controls a
TCXO operating at 73.35MHz to
provide downconversion to 1650kHz.
Direct loops are used giving great
spectral purity and a simple easily
serviced design.

OPERATING MODES

The standard transceiver is supplied
for A3J, and A3H operation. USB,
AME and CW operation is standard
and LSB may be provided as an
option. A separate power supply and

modem are available for FSK
(teletype operation). This power

supply provides additional cooling for
continuous operation at 100W
(average) power output. The high
performance FSK modem provides
direct connection to any standard
RTTY machine. As an option, high
speed TX/RX switching is provided for

simplex ARQ operation.

greatly to operating convenience. The
receiver audio squelch system is
designed to respond only to voice
signals and eliminates much of the
background noise, characteristic of
HF operation. The transmitter is
equipped with a VOGAD which
automatically adjusts the gain of
microphone amplifier and provides
maximum output power regardless of

voice level. The TW100 has
demonstrated compatibility with

various COMSEC security devices.
Please contact the factory for details.

FREQUENCY CALIBRATION

All channel frequencies are derived
from a single high stability crystal
oscillator. If it is ever necessary to
adjust the frequency calibration, a
single adjustment will set all channel
frequencies. When greater stability is
required, the HS10 High Stability
Option incorporates a 1 part in

107

TCXO and also provides 10Hz digital

incremental tuning in place of the
receiver clarifier.

POWER SUPPLY

The TW100 operates directly from
any 13.6V DC power source
permitting direct operation from a
vehicle or shipboard supply system.

Provision is made for the internal
installation of optional 28V DC or

115/230V 50/60Hz AC power supplies

which are rated for SSB service. A

base station power supply is also
available for teletype service. This
supply is rated for continuous service
and provides forced air cooling for
the transceiver power amplifier.

COMPANION LINEAR AMPLIFIERS

Companion all solid state linear
amplifiers are available to boost the
output power to either 500 to 1000
Watts output.

CONSTRUCTION

The case of the transceiver is a
rugged frame formed by the diecast

front panel and massive rear heatsink
joined by side extrusions. The
modules are mounted on a plate held
between the two side extrusions, and
the final amplifier mounts on the rear
heatsink. The main circuitry is

contained in 6 diecast boxes
providing complete RF shielding and

environmental protection. The six
modules, the PA assembly, the RF
filter module and the frequency
selection module are all easily
changed for field service. The entire

transceiver is constructed from
aluminum alloys and all external

hardware is stainless steel for
operation under the most severe

environmental conditions.

FULLY AUTOMATIC TUNING

When used in conjunction with the
companion digital AT100 Automatic
Antenna Tuner, efficient transceiver

coupling to a wide variety of whip and
wire antennas is fully automatic.
Tuning time for the radio with coupler
is typically 1 second.

AUDIO SYSTEM

The TW1 00 has two features that add

The modular design of the TW100 enhances serviceability.

CHANNELIZED OPERATION (CHANNELS 01-99)

PRESS
example

TO DISPLAY CHANNEL FREQUENCY PRESS

@] and CHANNEL NUMBER

@] OJ(i]

I£] Receive or simplex frequency is then displayed.

PRESS
(The frequency stays the same on simplex channels)

III Again or press microphone switch and the transmit frequency is displayed.

- ~

.>. ..,

l'~~.

OPERATIONAL MODES

The transceiver uses internal switches to select the three operational modes. In addition, the coding cicuits may be

removed so that the transceiver remains permanently in Mode 2 or Mode 3.
MODE 1

MODE 2

MODE 3

CONTINUOUS TUNE - CHANNEL 00

Channel 00 is the continuous tune channel.

ENTER
The transceiver is ready for the entry of a new frequency.

The memory channels and the continuous tune channel may be reprogrammed from the keyboard.
The memory channels cannot be changed. The continuous tune channel operates only in the

receive mode.
Only the memory channels operate and the frequency cannot be changed or displayed.

@]@][]J

<" ;. Rl!~t~E TRAK4"'1T • ~

To enter 8034KHz ENTER m@]rnIT]@]1Il

The frequency may be changed again. To change to ·11563.8KHz

ENTER

To enter a separate transmit frequency enter III again.

The complete keystroke sequency to enter 12.5654MHz receive and 13862.8kHz transmitis:

The transmit frequency is displayed at the end of the sequence.

If no separate transmit frequency is entered, the microprocessor automatically enters the receiver frequency in the
transmit memory.

The last frequency stored in Channel 00 is held in memory until changed by the operator.

MEMORY CHANNELS

A lithium battery with a life of 10 years is used to store all channels in permanent memory when the transceiver is

switched off. In Mode 1, the memory channels may be changed from the front panel using a special double

keystroke entry designed to prevent accidental erasure of the stored information.

UP DOWN TUNING

The
single press of the switch moves the frequency in 100Hz steps. HOlding

down a switch rapidly changes the frequency. The tuning buttons do not
move the transmitting frequency.

OJOJ[]][TIrnI]]0

I]£] and ION I tuning buttons are used for continuous tuning. A

SCANNING

Up to 98 channels may be scanned automatically by pressing the
ISCANIswitch. This switch is a toggle, press once to start the scan and

again to stop the scan.
Channel scanning starts at Channel 01 and stops at the channel number

designated by special keystroke entry. The channel numbers are
displayed as scanned.

INTERNAL OPTIONS

SELCALL SELECTIVE CALLING OPTION

This option permits selective calling of up to 256 stations per system as
well as an "all call" feature. This digital system, which is specifically
designed for high reliability in HF-SSB systems, includes a transpond
feature to automatically acknowledge receipt of a call. At the station
called the receipt of the selective call sounds an alarm and activates the

CALL indication on the LCD display.
The code of the station being called is entered on the keyboard and it is

shown on the display before transmission.

When the selective calling system is used in conjunction with the scan mode, the call is repeated until the called
station scans to the calling frequency and receives the correct call code. The called station stops scanning, sounds
the alarm and sends back an automatic reply, which, in turn, stops the call sequence. If the call is not answered
within 60 seconds, the scan mode is resumed but a "CALL" indication remains on the display of the called station.

TRANSCALL ADAPTIVE SYSTEM

The TRANSCALL option is an adaptive HF communications system for fixed and mobile stations incorporating the
SELCALL option and, in addition, providing automatic evaluation of the communications path on up to ten different
channels. The path selection is based on lowest error rate detected on digital burst transmissions as well as on
signal strength. After the best available path is chosen, audible and visual alarms alert the operators. This results in
a fully-automated system which adapts to rapidly changing HF propagation conditions while reducing the need for
specialized operator training.

Operation of the TRANSCALL system is as simple as using a telephone. The three digit station code is entered on
the keypad and the TRANSCALL button is pressed. The operator then waits for the radio to select the best channel
and the call to be answered. The selective calling system may be used in both TRANSCALL and normal operating
modes and is fully compatible with the standard SELCALL selective calling system. To avoid interruption to existing
communications, TRANSCALL monitors each channel for traffic before attempting to establish the link.

The TRANSCALL system is an internal microprocessor controlled module fitted to the standard Transworld TW1 00

and TW1OOSXtransceivers. No separate control units or special connections are required. The selection of

TRANSCALL or Selcall modes is from the radio's front panel and code entry is through the transceiver keypad.
TRANSCALL equipped radios can be used with either broadband antennas (e.g. ABB Series) or with whip or longwire

antennas in conjunction with the AT1

1000 Watt Linear Amplifiers and in many remote control configurations.

UL

WB
RC

HS10
ARC

NB

The standard TW100 is configured for Upper Sideband only. This option adds Lower Sideband capability

Replaces the standard sideband filters with special wideband (300-3100Hz) filters which may be required in some
high speed data and burst applications.

Adds the capability for Remote Control operation using the
Computer Control.

Increases frequency stability to 1 part in
Permits high speed (20mS) RxITx switching for simplex SITOR/ARQ operation.
Reduces interference from impulse type noise (e.g., automotive ignitions, etc.).

OO/M Memory Antenna Tuner. TRANSCALL can also be used with the 500 and

TW5201/RT5201 Remote Control Units or RS232

107. Also replaces analogue receiver clarifier with digital 10Hz steps,

~aNswoMLi:llrM

for communications

ACCESSORIES AND ANCillARIES

REMOTE CONTROLS

When equipped with the RC option, the TW100 can be
connected to a remote control unit to give complete control of
the transceiver over any voice grade two or four wire line or

radio link. The TW5201 remote head duplicates the control
functions available from the radio's front panel including
frequency changing, mode selection, etc. The remote control is
used to operate the transceiver from a remote site, from an
alternate operating position, or as the control head in a vehicle
mounted mobile installation (model RT5201). As an option,

TRANSCALL capability can be added to a remote control if a

metallic (DC continuity) wire line is available to the radio.

PF100 HEAVY DUTY POWER SUPPLY

Addition of this unit permits use of the TW100 in radioteletype,

facsimile and other applications requiring 100W Average
continuous output. The PF100 is designed so that the TW1 00

fits on top of it to provide additional radio cooling. Operating

power is 115/230'1. 50/60Hz.

PF5100 HEAVY DUTY POWER SUPPLY
AND MODEM

This unit consists of,a PF100 Power Supply and a high

performance FSK Modem, permitting direct connection to a

wide variety of TTY machines with neutral, polar or low level

RS232/MIL 188C interfaces.

AT100 AUTOMATIC ANTENNA TUNER

The AT100 is designed to quickly and efficiently match the 50
ohm output of the TW1 00 to a wide variety of whip and longwire
antennas. Tuner operation is fully automatic an.d typically

requires about ooe second. The AT100 is mounted in a heavy
duty fiberglass case which permits all weather operation in both
mobile and fixed station operation. A special version of the
tuner, model AT1OO/M, is available with 10 memory channels (in
addition to the automatic tuning mode) for use in channel
scanning and adaptive systems.

ABB SERIES BROADBAND ANTENNAS

The ASS Series of antennas is specially designed to offer

broadband coverage over the entire 2 to 30 MHz HF spectrum

and is optimized for short and medium range up to 2500 Km.

Several models are available to meet various power level and

space requirements.

TW500A 500W PEP LINEAR AMPLIFIER

This all solid state Linear Amplifier is designed for voice
operation to increase the output power of the TW1 00 to 500W

PEP output. It is also available as part of the TW11 00 rack
mounted system package complete with TW100 Transceiver
and optional accessories.

TW1000A 1000W PEP/AVERAGE

LINEAR AMPLIFIER

The TW1000A is an all solid state Linear Amplifier designed for

continuous duty voice, FSK or FAX operation to increase the

output power of the TW100 to 1000W PEP and Average output.

The TW1000A operates direct from a high current 28VDC source

such as the PS1000 115/230VAC Power Supply. It is also available

as part of the TW1500 rack mounted system package complete
with TW100 Transceiver, Power Supply and optional accessories.

TW5500 RTTY/ARQ MESSAGE TERMINAL

This Message Terminal is an integrated unit which combines the
functions of an electronic teleprinter with advanced message
handling capabilities, and a high performance FSK modem. As
an option it can also be fitted for SITaR (ARO/FEe) operation.
The TW5500 connects directly to the TW1 00 with PF100 Power
Supply to provide complete facilities for the transmission,
reception and storage of messages, including automatic
operation and selective calling.

TW100

MD DESK MICROPHONE

This is a high quality dynamic

Desk Microphone with push-to-
talk bar.

RM RACK MOUNT KIT

Permits installation of TW1 00 in standard 19 inch rack cabinets.

Requires 5.25 in (13.3m) panel space.

PSA POWER SUPPLY ADAPTER

The PSA unit provides charging of a customer-supplied 12 (or

28) VDC battery with automatic reversion to battery power in

case of mains failure.

TW5800 TELEPHONE INTERFACE

This unit permits interconnection of the TW1 00 with standard

telephone lines. Both manual and VOX operation is provided. A

rack mounted version is also available.

MR HAND MICROPHONE

This is a rugged high quality hand microphone.

TECHNICAL SPECIFICATIONS

GENERAL

POWER SUPPLY

TRANSMITTER

FREQUENCY RANGE: 1.6 - 30MHz in 100Hz (optionally 10Hz) synthesized steps

FREQUENCY ENTRY: Keypad controlled microprocessor
CHANNELS: 100 Simplex and Half-Duplex
CHANNEL PROGRAMMING: Mode 1 Front Panel, Modes 2/3 Internal

CONTINUOUS ENTRY: Channel 00 by keypad entry. Mode 1: Transmit

FREQUENCY DISPLAY: 6 Digit by keystroke (locked out in Mode 3 and SX Models)
PROTECTION AGAINST UNAUTHORIZED FREQUENCY CHANGE: Coding device may be removed
from TW1 00 to lock transceiver in Mode 2 or Mode 3. TW100SX requires use of special external

programming unit.
TUNING: Up
SCANNING: Automatic 2-98 channels
ANTENNA IMPEDANCE: 50 Ohms, SO-239 connector
TEMPERATURE RANGE: - 30° to

SHOCKIVIBRATION: Testing methods in accordance with MIL-STD-810D

FREQUENCY CONTROL:
MODES: Simplex and Half-duplex

OPERATION MODES A3J (USB/LSB*), A3A* (SSB reduced carrier), A3H (compatible AM),
A 1 (CW), F1 (teletype)* *Optional
COMSEC: Demonstrated compatability with various COMSEC units

TX/RX SWITCHING: 20mS maximum
SIZE: 4.25H x 13.5W x 17.5D in. (10.8 x 34.3 x 44.5cm)

WEIGHT: AC-13kg (28.6 Ib), DC-11.6kg (25.5 Ib)

13.6V DC
28V DC NOMINAL (20-32V): Receive 350mA, Transmit 7A Average SSB
Internal AC power supply 110/230V
External power supply 110/230V

POWER OUTPUT: 125W PEP, 100W Average (FCC Type Accepted Parts 81,83,90,97 at

OVERLOAD PROTECTION: Protected against mismatch including open and shorted antennas
CARRIER SUPPRESSION: Greater than - 50dB

UNWANTED SIDEBAND - 60dB at 1kHz typical
SPURIOUS SUPPRESSION: Greater than - 63dB

HARMONIC SUPPRESSION - 63dB (except below 2MHz)
AUDIO INPUT: 150 Ohms, VOGAD for constant audio level, 600 ohms CldBM (rear connector)
AUDIO BANDWIDTH: 300Hz to 2700Hz (300Hz to 3100Hz optional)
INTERMODULATION DISTORTION: - 32dB typical
ALC: Less than 1dB increase for 20dB increase in audio input
AUDIO COMPRESSION: No significant distortion
METERING: Relative RF output (calibrated 100W full scale)

& Down Pushbutton Switches (receive only), 100Hz steps

± 20 %: Receive 620mA, Transmit 12A Average SSB

120 Watts)

SX Models require external programmer

& Receive

Mode 2: Receive Only Mode 3/SX Models: Disabled

+ 60°C

± 0.0001 %, ± 20Hz maximum (1 part in t07 with HS10 option)

± 10%, 50/60Hz for SSB operation

± 10%, 50/60Hz for FSK operation, optional built-in FSK modem

and tliermal overload

+ 30dB above normal

RECEIVER

SENSITIVITY: 0.35flV for 10dB SINAD (front panel selection of 12dB attenuator)
SELECTIVITY: 300 to 2700Hz at - 6dB. - 60dB at 5kHz (optional 300Hz to 3100Hz at - 4dB)

IMAGE REJECTION Greater than 80dB
IF REJECTION: Greater than 80dB
INTERNAL SPURIOUS: Less than 6 audible, all below 0.3flV
CONDUCTED RADIATION: - 85dBm
AGC CHARACTERISTICS: Less than 6dB audio increase from 3flV to 300,000flV, dual time

INTERCEPT POINT:
INTERMODULATION: - 85dB

CLARI FIER:
SQUELCH: Audio derived syllabic-type, noise immune
NOISE BLANKER Optional, pulse type

AUDIO OUTPUT: 4W into 3 ohms, internal loudspeaker, separate 600 ohms OdBM squelched

METERING: Relative signal strength

± 125Hz minimum (± 70Hz in calibrated digital 10Hz steps with HS10 option)

and unsquelched outputs (rear panel)

constant for voice or FSK/CW

+ 11dBM, + 23dBM with attenuator activated

Specifications subject to change without notice.

PL 3/89