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Midian VPU-12A Manual

16-code voice inversion scrambler
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VPU-12A
16-Code Voice Inversion Scrambler
Manual Revision: 2013-04-01
Covers Software Revisions:
VPU-12A: 3.0 and higher
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Summary of Contents for Midian VPU-12A

  • Page 1 VPU-12A 16-Code Voice Inversion Scrambler Manual Revision: 2013-04-01 Covers Software Revisions: VPU-12A: 3.0 and higher...

  • Page 2: Specifications

    Number of Inversion Codes GENERAL INFORMATION Midian’s VPU-12A voice inversion scrambler provides an entry level of voice security for two-way radio communications. The VPU-12A provides up to 16 different inversion frequencies that are selectable using 4-line binary. These inversion frequencies are programmable using Midian’s KL-3. The VPU-12A is compatible with...

  • Page 3: Product Programming

    PRODUCT PROGRAMMING The VPU-12A comes preprogrammed with default inversion frequencies (see Table 1 below). By configuring the 4-line binary outputs, the desired inversion frequency can be selected. Other default features are a Power-Up State of Clear, a Mode Select of Momentary and a Mode Polarity of Active Low. If different parameters are needed, the KL-4 programming interface and MPS programming software will be needed.
  • Page 4 Switch Mode: Select whether the switch being used for mode selection is a momentary or latched switch. Power Up State: Select the mode you wish the scrambler to go into upon power up. Clr/Scr Polarity: If +/- is selected then the clear mode will be a positive polarity and scramble mode will be a negative polarity.

  • Page 5: Hardware Installation

    HARDWARE INSTALLATION Be certain to follow standard anti-static procedures when handling any of Midian’s products. P1-4 – Black – Ground – Connect to the nearest ground point. P1-2 – Red - +3.7 – 15 VDC – Connect to switched B+ in the radio.

  • Page 6: Radio Programming

    HARDWARE ALIGNMENT The VPU-12A is a unity gain device. If for some reason more or less gain is needed adjust R-2, R-12, R-18 or R- 19 as needed. For the TX Input, Midian recommends having 1 V p-p at Pin 1 of IC-5. Adjusting R-2 will adjust the level at Pin 1 of IC-5.

  • Page 7: Operation

    Mode Selection: The mode of the VPU-12A can be controlled by a momentary or latched switch. Latched Switch: Programming the VPU-12A to latched with a Mode Polarity of +/- will cause the scrambler to be in clear mode when high and scramble mode when taken to ground. A Mode Polarity of -/+ will cause the scrambler to be in clear mode when taken to ground and scramble mode when high.

  • Page 8: Technical Notes

    If installed after pre-emphasis and before de-emphasis, the recovered audio may be noisier due to the amplification of the noise. If installed before pre-emphasis and before de-emphasis, recovered audio will be de-emphasized (bassy). If installed after pre-emphasis and after de-emphasis, recovered audio is pre-emphasized (tinny). MIDIAN CONTACT INFORMATION MIDIAN ELECTRONICS, INC. 2302 East 22 Street...
  • Page 9 ** = TO USE MODE LED REMOVE D4 AND INSTALL R34 IC5:5 IC3:3 +3.7V to +15V[RED] *** = TO USE AUDIO EN REMOVE D3 AND INSTALL R36 LMV324 LMV358 MIDIAN ELECTRONICS, INC. DOCUMENT NAME VPU-12A P1:4 APPR DATE: 2007-07-01 DWN BY:...
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