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Defender Modem

D856-DF Defender

Digital Voice & Data Modem  

 

The D856-DF Defender is a low rate voice and data HF modem for secure communications. The D856-DF Defender can be connected to most modern HF transceivers and VHF/UHF radios.

The D856-DF Defender applies a complex adaptive mechanism, so it is especially perfect on HF channels where signal propagation is determined by the fact that it's repeatedly reflected from the ionosphere and the earth surface and significant changes of propagation conditions depending on the geographical location, frequency, time of day, season, solar activity, and other circumstances.

A voice part of the D856-DF Defender includes all elements of typical digital voice encryption system: a digital speech coder (vocoder) which transforms the speech into a digital bit stream, a digital encryption & decryption block to encode and decode the bit stream, and a modem to transmit and receive the encrypted digital information.

A data part of the D856-DF Defender is a three rates HF modem – 600, 1200 and 2400 bps.

The D856-DF Defender automatically detects and processes the incoming signal with different bps rates (Autobauding).

The D856-DF Defender automatically detects and processes the incoming signal clear or encrypted (Automode).

The SM10 Speaker Microphone (1W) is included.

The D856-DF Defender is connected to most modern commercial radios and transceivers.

The D856-DF Defender has the ability to be upgraded with any future improvements via upgrade file.

The programming and key loading is occurred via PC.

The D856-DF Defender is a digital device of D856 series. More than 72 quadrillion digital keys combinations. Three data and vocoder rates 2400, 1200 and 600bps.