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This page only applies to the VS-115-SM1G.
Number of Codes:
The VS-115-SM1G supports up to 4 codes. The codes can be programmed for either Rolling
Double Inversion or Fixed Double Inversion scrambling.
Power Up In Scramble Mode:
If selected the unit will start up in secure mode when the power is turned on. If it is
desired to have the unit always in secure mode, then check this box and do not assign a button for mode select.
TX Pre/De-emphasis Enable:
This setting controls the use of audio emphasis by the scrambler while
transmitting. If checked, the scrambler will perform pre-emphasis before scrambling and de-emphasis after
scrambling. If the radio performs pre-emphasis of TX audio after the scrambler insertion point, this box should be
checked. If this information is not known, choose the option that yields the best recovered audio quality. See the
diagram on the next page.
RX Pre/De-emphasis Enable:
This setting controls the use of audio emphasis by the scrambler while
receiving. If checked, the scrambler will perform pre-emphasis before de-scrambling and de-emphasis after de-
scrambling. If the radio performs de-emphasis of RX audio before the scrambler insertion point, this box should
be checked. If this information is not known, choose the option that yields the best recovered audio quality. See
the diagram on the next page.
Continuous Synchronous Capture:
This setting determines what will happen if a rolling code synchronization
tone is received after the receiving scrambler has already synchronized and is de-scrambling. If this checkbox is
cleared, a synchronization tone received before it is expected will be ignored. This may help prevent the
receiving scrambler from incorrectly synchronizing on some tones in speech. However, the receiving scrambler
may fail to synchronize properly with another scrambled transmission started immediately following the end of the
previous transmission, preventing the first few seconds of the second transmission from being properly
descrambled. If this happens frequently, this checkbox should be checked to enable Continuous Synchronous
Capture mode, which instructs the receiving scrambler to re-synchronize any time a new synchronization tone is
received.
