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.
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