Technical data

20
The unit has been constructed as based on the principles of non-parametric signal
conversion.
At the input of the encryptor, the analogue signal (voice) is converted into digital with
the employ of an 8-bit analog-to-digital converter. Cosine and sine digital filters are used to
determine the vector of the phase of the transmitted voice signal at a specific point of the
message. The envelope metering unit is used to measure the amplitude of the transmitted
signal, and it the delta-increment of the envelope that is subjected to further processing. After
the completion of above-indicated measurements (the phase and the envelope), the digital
sequence of parameters of the voice signal is put together modulo two with pre-created
pseudo-random sequence (generated by the cryptographic protection unit using the "Tiger"
algorithm of encryption) in accordance with a pre-input key. After that, it comes into the
synthesizer that is there to convert the resulting digital sequence into a form, convenient for
further processing. Then, the resulting digital flow is forwarded into the 8-bit digital-to-analog
converter.
As a result, at the output of the encryptor there appears an analog signal of the 500-
2850 Hz band, and goes into the linear amplifier that provides a normal loading for the radio
set.
On the receiving end of the communication channel, the information is
processed in the reverse order.
An input device or a personal computer is required to enter the working keys.
Deliverables:
The encryptor;
An input device;
A package of operating manuals.
Technical characteristics:
Communication establishment time - 0.5 sec maximum;
Service band - 300-3400 Hz;
Communication establishment probability – 0.98;
Admissible signal-to-noise ratio - 3:1
Radio set – VHF/UHF band;
Power supply – 4.5V(battery);
Operating mode - simplex;
Dimensions 65х120х20;
Power consumption – 0.45W maximum .