Midian’s VS-1000 series of inversion voice scramblers protect your voice communications against casual listeners. By mixing the frequency of the voice with an inversion tone in a balanced modulator, sum and difference frequencies are created. A low-pass filter eliminates the sum and the difference is transmitted as “inverted voice”. The “inverted voice” undergoes an identical process on the receiving end that reconstructs the voice.

The MT1 series products are supported in the following Motorola MOTOTRBO radios in analog mode only:

Portables: DGP-4150, DGP-6150, DP-3400, DP-3401, DP-3600, DP-3601, XiR-P8200, XiR-P8208, XiR-P8260, XiR-P8268, XPR-6300, XPR-6350, XPR-6380, XPR-6500, XPR-6550, XPR-6580

Mobiles: DGM-4100, DGM-6100, DM-3400, DM-3401, DM-3600, DM-3601, XiR-M8220, XiR-M8228, XiR-M8260, XiR-M8268, XPR-4300, XPR-4350, XPR-4380, XPR-4500, XPR-4550

• Mode indication tones
• Protects against casual listeners
• Scramble/clear mode is selectable
• User-programmable for up to 16 codes
• User-programmable to any inversion code between 2100 – 4096 Hz
• Programmable after installation in the radio using our MPS.