E-747 Encoder

The Whelen E-747 Encoder

Whelen systems use a high speed Dual Tone MultiFormat (DTMF) method of encoding. Because of the critical timing used in Whelen's encoding system, security is as great as any other system and better than most. DTMF methods allow for as few as one or as many as 10,000 unique addresses to be employed in any one system. This allows for single site operation, multiple site operation, zone addressing, multiple commands to the units and two way reporting of the units in the field.

The Whelen E-747 Encoder is ideal for smaller systems. It can be used in conjunction with other Whelen model encoders or as a stand alone unit. It can be installed in mobiles allowing for a very flexible back up encoding site sounding ALL sirens.

The 747 has capability of individually addressing any one of ten sites. You can use the 747 to sound multiple sirens but you can only individually control 10 individual units.

The operation of the encoder is easy. Using the labeled buttons on the front of the unit you select the function you desire. Then using the number keypad you select the siren number you desire to activate or ALL. The buttons you have pressed will light with a small RED light to indicate your keystrokes. Then you press SEND and the unit/s will activate.

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