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This is a single-inversion voice
scrambler/descrambler. Though no longer useful for police scanners, it would be a fun
project for a hobbyist. It was designed for use on a 9-volt battery, but by changing
resistor values proportionately, it could be adapted to use whatever voltage is available
in your radio. The scramble frequency should be in the 3KHz-3.5 KHz range. |
