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GENERAL INFORMATION
Midian’s GPS speaker microphones encode a user’s GPS coordinates along with the user’s ANI and Emergency
ANI to display on Midian’s CAD-800 or CAD-800U base station controllers. The following is a list of benefits
provided by Midian’s GPS systems:
Allows dispatchers to know who he or she is talking to.
Identify system abusers.
Identify emergency conditions.
Assign calls fairly.
Track user location.
Midian’s SM1G series encodes ANI and Emergency ANI along with Midian’s GPS location reporting to Midian’s
CAD-800 or CAD-800U which uses a Google Earth interface to display the unit’s location on a map.
The SM1G series also offers Man-Down and Lone Worker features. If the unit does not detect movement (Man-
Down) or receive any user interaction (PTT or Lone Worker Reset button) for a programmable period of time the
unit can key the radio and send the Emergency ANI.
In addition to the above encoding features, Midian’s GPS speaker mics can decode commands from the CAD-800
such as Polling, Selective Calling, Radio Disable, Radio Enable, Spy (Remote Monitoring) and Emergency
Acknowledge. Polling allows the dispatcher to request a unit’s GPS location. Selective calling can be to call an
individual unit, a group of units or all units. If a unit becomes lost or stolen, it can be disabled, so it cannot
interfere with the system. If the unit is later recovered the unit can be re-enabled. The Spy function enables the
dispatcher to eavesdrop on a unit during an emergency or other condition. If multiple Emergency IDs are
transmitted, the dispatcher can stop subsequent Emergency ID transmissions using the Emergency Acknowledge
feature.
VS-1200:
The VS-1200 is a Digital Signal Processor (DSP) based Frequency Domain voice scrambler offering a high level
of voice privacy. The DSP converts the analog signal into quantitized digital data. It then converts the “Time
Domain” signal into the “Frequency Domain”. This results in an audio “frequency spectrum”, which is then
partitioned into bins that are encrypted by the non-linear key generator. The digitized data is converted back to
the analog realm using a digital to analog converter.
The above technique and the lack of synchronization result in excellent audio quality, high security and enable the
VS-1200 to be used in virtually any type of radio system. These systems include HF SSB, Conventional Two-
Way, Trunking, Voting and Simulcast.
VS-115:
Midian’s VS-115 is a rolling double inversion scrambler that offers 1020 possible codes (4 groups with 255 codes
per group). Of these codes the scrambler may be programmed with up to 4 of these codes. The VS-110 series is
compatible with Icom’s UT-110.
VS-1150:
Midian’s VS-1150 is a double inversion scrambler (aka split-band scrambler) that offers 32 possible codes. Of
these 32 codes the scrambler may be programmed with up to 4 of these codes. The VS-1150 series is compatible
with Midian’s VPU-6, Icom’s UT-109 or Inysa’s XPTO.
VS-1050:
Midian’s VS-1050 is a voice inversion scrambler that provides up to 4 different inversion frequencies that are
button selectable. The programmable inversion frequency range is from 2100 Hz to 4096 Hz and provides
compatibility with Midian’s VPU series voice inversion scramblers, as well as other industry inversion scramblers.
