SNV-12 Operations Manual
3-61
Special Notes Regarding SVM Dipswitch Assignments
The switches SW2-5 and SW2-6 set the audio derived COR threshold only if SW2-2 and SW2-
3 are both on, configuring the SVM to the Audio Derived COR type. If SW2-2 and SW2-3 set
the SVM for either Pilot Tone or Hardwired COR, SW2-5 and SW2-6 instead fill the other
function listed in the table.
Switches SW3-7 and SW3-8 are used for AGC link equalization whenever the Pilot Tone AGC
feature is enabled (SW5-1). This prevents the use of the Frequency Response Line Equalization
feature.
There is no SW5 dipswitch on the SVM-1. SW5 was added with the new SNV-2. Some of the
functions of the SW5 can be enabled with the SVM-1 by grounding the assigned rear panel
terminal block pin. See SW5 text for details.
Table 3-51
SVM Jumper Settings
Jumper
Function
Pos 1&2
Pos 2&3
JP1 RX Audio Input Impedance
Low (600 ohms) *
High (10k ohms)
JP2 RX Audio Input – Balanced/Unbalanced
Balanced *
Single-Ended
JP3 COR Input
Normal (logic level)*
E&M
JP4 PTT Output
Normal (logic level)*
E&M
JP5 TX Inhibit; Terminal Block Pin 19 Configuration
Active Low *
Active High
JP6 E&M Return Configuration
Internal Ground *
Connected to Pin 10
Notes:
Factory default jumper settings marked by *
SVM-1 has JP1 only
No JP6 on some early revision SVM-2 Modules. These early units were wired for internal ground.
Pin #1 indicated by square pad. See Figure 3-9 for pictorial view of jumper settings.
3.12.6.1
SVM Jumper Configuration
The jumpers on the SVM module are listed on Table 3-51 and shown on Figure 3-9.
JP1 RX Audio Input Impedance
The RX Audio input port can be set to either 600 ohms (JP1 on pos 1&2) or 10k ohms (JP1 on
pos 2&3).
JP2 RX Audio Input Configuration
The RX Audio input port can be set to either balanced (JP2 on pos 1&2) or unbalanced (JP2 on
pos 2&3). The balanced configuration is highly recommended because of the superior noise
immunity it provides. However, it can‟t be used unless the voting receiver and/or linking
medium provide a balanced audio output.
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