SNV-12 Operations Manual
3-62
JP3 COR Input Configuration
The options are NORM (JP3 on pos 1&2) or E&M (JP3 on pos 2&3). When set to NORM, the
SVM expects a logic level signal to indicate the active COR (receiver unsquelched) condition.
This logic level signal may be either active low (factory default) or active high, depending on
the setting of SVM dipswitch SW2-7. When set to E&M, the SVM expects a negative input
lower than –10 VDC to indicate active COR. An inactive COR requires an input of –0.5 VDC
or higher. If dipswitch SW2-7 is set to Active Low, a signal below –10 VDC will indicate
inactive COR.
Note: The SVM must also be set to the Hardwired COR mode for the E&M
input to be used. See directions for SW2-1, 2, 3.
Note: Negative input signals can damage the SVM-2 if JP3 is not set to
E&M.
JP4 PTT Output Configuration
The SVM PTT Output signal may be set as either an open-collector transistor that pulls low
when PTT is activated (JP4 pos 1&2), or as an E&M output, with a relay contact closure (JP4
pos 2&3). The relay contact closure can either be to an internal ground, or the E&M signal can
be looped back out to a rear panel terminal depending on the setting of JP6.
JP5 Pin 19 Configuration
JP5 determines whether the input terminal at Pin 19 is active low (JP5 pos 1&2) or active high
(JP5 pos 2&3). Note that the function of Pin 19 is set by dipswitch SW5-3 and may be either
TX Inhibit or Unsquelch Inhibit.
JP6 E&M Output Configuration
If JP6 is set to Ground (pos 1&2), the PTT output/E&M relay output pin 18 is internally
grounded when the SVM is in the TX mode. When set to Return (pos 2&3), the signal is
looped back to terminal block pin 10 whenever the SVM is in the TX mode.
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