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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 VPU-12A

Page 1: ...1 VPU 12A 16 Code Voice Inversion Scrambler Manual Revision 2013 04 01 Covers Software Revisions VPU 12A 3 0 and higher ...

Page 2: ...ncy Error 0 25 Device Gain or Loss Unity Inversion Frequency Range 2100 4100 Hz Number of Inversion Codes 16 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 ...

Page 3: ...rn Wht 1100 13 3500 Gray Wht 1101 14 3729 Grn Wht 1110 15 4096 None 1111 16 3276 The VPU 12A is programmed using the KL 4 programming interface and MPS programming software Please reference the KL 4 manual for setup of the programming hardware and software Set the parameters of the software to fit the application If any clarifications on a feature are required move the mouse cursor over the featur...

Page 4: ...polarity and scramble mode will be a negative polarity If is selected then the clear mode will be a negative polarity and scramble mode will be a positive polarity Code 1 16 Set the desired inversion frequency for each code position The table on the previous page shows which code is selected based upon which 4 line binary inputs are selected If only one code is being used program that code in Code...

Page 5: ... program out connect this lead to the yellow clip lead from the KL 3 P1 5 Blue Program In Connect this wire to the green clip lead from the KL 3 P1 8 Green White Frequency Select A Frequency select A B C and D are used to determine the selected inversion frequency see Table 1 above P1 10 Gray White Frequency Select B Frequency select A B C and D are used to determine the selected inversion frequen...

Page 6: ...son 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 For the RX Input Midian recommends having 1 V p p at Pin 7 of IC 5 Adjusting R 12 will adjust the level at Pin 7 of IC 5 For the TX Output Midian recommends matching the level of the radio that is present at t...

Page 7: ...igh Momentary Switch Programming the VPU 12A to momentary with a Mode Polarity of will cause the scrambler to toggle modes when taken to ground A Mode Polarity of will cause the scrambler to toggle modes when taken high Code Selection Single Code If only a single inversion frequency is desired connect the frequency select lines to ground as indicated in Table 1 above Otherwise if no frequency sele...

Page 8: ...o 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 22nd Street Tucson Arizona 85713 USA Toll Free 1 800 MIDIANS Main 520 884 7981 E mail HUsales midians comU Web HU...

Page 9: ...OC10 PIC1101 PIC1102 COC11 PIC1201 PIC1202 COC12 PIC1301 PIC1302 COC13 PIC1401 PIC1402 COC14 PIC1501 PIC1502 COC15 PIC1601 PIC1602 COC16 PIC1701 PIC1702 COC17 PIC1801 PIC1802 COC18 PIC1901 PIC1902 COC19 PIC2001 PIC2002 COC20 PIC2101 PIC2102 COC21 PIC2201 PIC2202 COC22 PIC2301 PIC2302 COC23 PIC2401 PIC2402 COC24 PIC2501 PIC2502 COC25 PIC2601 PIC2602 COC26 PIC2701 PIC2702 COC27 PIC2801 PIC2802 COC28...

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