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The device can send messages at a speed of 75, 150 or 600 baud, and was
inteded for use by air observers, reconaissance units,
special forces (SF) and forward artillery.
It measures 210 x 105 x 52 mm and weights 1.67 kg, battery included.
The unit is housed in a military green enclosure with connections at the
front and controls at the top. Operation is via a rotary
selector, a volume knob and a 16-button keypad.
Towards the rear is a red 9-digit alphanumeric LED display
with a hinged cover to shield it from bright sunlight.
A protective green raincoat is available separately.
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The TMD-326 was commonly used with a manpack radio, such as the
AN/PRC-77,
or a vehicle set like the AN/VRC-47 (RT-524), in which case it was to
the spare U-229 socket
(re-transmit) of the radio. It can also be modified for other types of
radio sets, such as the BE/GRR-476.
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The TMD-326 can be fitted inside the green carrying pouch shown in the
image on the right. It can be attached to a soldier's webbing and protects
the keyboard and display.
The pouch has a flap at the top that covers the controls, and is held in
place withg Velcro strips.
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This is the actual TMED device, which is fully self-contained.
It is powered by an internal 7.2V NiCd battery that is installed at the
bottom, just below the display.
At the front is an U-229 socket – for connection to a radio set –
and a 14-pin female socket for connection of auxiliary equipment,
such as the IB-326 interface box.
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Messages from the TMD-326 can be printed directly on a teleprinter (telex)
by using the IB-326 interface box shown in the image on the right.
The box is connected to the AUX connector of the TMD-326 by means
of a CX-326C cable, whilst the
teleprinter should be connected to the
ADo-8 socket
at the rear.
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Device Burst message terminal Manufacturer Tadiran Message Up to 16 nine-character groups (sentences) Modulation Frequency Shift Keying (FSK) using internal modem Baudrate 75, 150 and 600 baud (bits per second) Bit error 5·10-4 at 12dB S/N Audio out 1.4 mV into 150Ω load Audio in 0.1 to 3V from radio set Display 9-digit alphanumeric Power 7.2V DC NiCd battery Current 420 mA in operations (100 mA with display off) Temperature -40°C to +55°C Dimensions 210 x 1-5 x 52 mm Weight 1.67 kg with battery
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6T-133 Rechargeable 7.2V NiCd battery TMD-330 Printer CW-326 Carrying pouch IB-326 Interface Box TMD-328 Power Supply Unit CX-326/A Audio cable to radio set CX-326/C Auxiliary cable (for IB-326 interface box) CX-326/D Power cable
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© Crypto Museum. Created: Sunday 16 June 2019. Last changed: Saturday, 07 January 2023 - 15:10 CET.
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