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DTMF (Dual Tone Multi-Frequency) Devices

Terrorists in several countries have tried adapting any electronic equipment they can get their hands on, to convert it into a method of remotely detonating an improvised explosive device.

DTMF devices are the essential element in touch tone phones. When an individual key on the phone keypad is pressed, a DTMF encoder generates a set of two discrete audible tones. These tones are heard through the earpiece on the handset or through the loudspeaker of phones having that function. The audible tones can be transmitted by wireless phone signal (cordless phone, cell phone or satellite phone). At the IED, there is another phone to receive the transmitted signal and dual tones, and a tone decoder. This is attached to an electric detonator and battery. When the bomber phones that number and presses the correct code sequence, the receiving telephone sends it to the tone decode and triggers the detonator.

A signal DTMF coded signal can detonate up to 10 different IEDs, so a similar effect to daisy-chaining can be created in one location; alternatively, 10 different IEDs can be set off simultaneously in 10 different locations, from a remote signal source device.

DTMF (Dual Tone Multi-Frequency) Devices

CELLPHONE INITIATED IED
Order Sku: ITA-103-CELL
Cell phone Initiated IED. Device initiates on incoming signal.

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TRANSCEIVER INITIATED IED IN BOX
Order Sku: ITA-103-TRAN
Transceiver Initiated IED in Box - Radio-controlled command detonation IED, with dual servo motors for redundancy. Same basic unit as ITA-102, but without automatic electronic arming features. Manual arming only. In all other respects, identical to ITA-102. All batteries supplied for transmitter and receiver in both ITA-102 and ITA-103.

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