4-7
Voice Scrambling/Encryption
34
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Difference between rolling and non-rolling types
The rolling type (in fact, hopping type is used for the UT-110R) is an additional feature which provides higher
communication security. It changes the divided frequency over a specified period.
Voice scrambling function
The optional voice scrambler unit provides high performance private communication between stations with the
same scrambler code. The 32 code non-rolling-type voice scrambler UT-109R and 1020 code rolling type UT-
110R are available.
Rolling Type (UT-110R)
300Hz
3kHz
Level
Frequency
Dividing Frequency is
changed over specified
period
Dividing Frequency
Low
High
Non-Rolling Type (UT-109R)
300Hz
3kHz
Level
Frequency
Dividing Frequency is fixed
with programming
Dividing Frequency
Low
High
Original AF
300Hz
3kHz
Level
Frequency
Dividing
300Hz
3kHz
Level
Frequency
Dividing Frequency
Inverting
300Hz
3kHz
Level
Frequency
Dividing Frequency
¾
Variable Split and Frequency Inversion
This is the scrambling system employed in the UT-109R and UT-110R. The audio frequency band is divided at a
specified frequency (divided frequency) and high and low audio frequencies in each band are inverted. The
divided frequency is programmable with cloning.
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Digital Voice Encryption Function
The IDAS system provides a 15-bit key (about 32,000 keys) encryption for secure communication.
1 0 1 0 1 0 1 0
1 0 1 0 1 0 1 0
Υ
Υ
Key
Key
Digital Audio
Encryption
Decipher
Digital Audio
TX
RX
