User's Manual Part 1

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Audio Scrambler
When using the internally fitted audio scrambler accessory PCB that provides
backwards compatibility to the 900 series audio inversion scrambler (BCA20031) or
the Transcrypt scrambler (BCA20054), the scramble code is set using this option.
All stations using the scramblers require the same scrambler code to be entered:-
The code can be selected between 1 and 16 for the Transcrypt
scrambler (BCA20054) or 1 and 32 for the audio inversion
scrambler (BCA20031):-
press the key
Note:- If using the internally fitted rolling code audio scrambler accessory
PCB (BCA20054) the code is set on the unit before installation using an
external programmer.