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SNV-12 Operations Manual
4-8
4.6.7
RX Input Level Indication LEDs, Test Point and Adjustment Potentiometer
Two RX level indication LEDs, along with the RX level adjustment potentiometer, are
available through a window in the SVM-2 front panel. When the RX input is properly set, the
green “normal” LED will be lit whenever a field radio is transmitting and its user is talking,
while the red “peak” LED should only flash occasionally during voice peaks. If the normal
LED never comes on or the peak LED never flashes, the RX input is set too low. If the peak
LED stays on or flashes more than occasionally, the level is set too high. Note that there will
be differences in LED activity between load talkers and quiet talkers. If the pilot tone level is
set at standard voice level, the green LED may be on whenever the site receiver is squelched
The RX level test point is also available through the window. Besides its use during the initial
setup, this test point can be used to check for degradation or changes in the link to the site‟s
receiver. Simply measure the pilot tone level on a regular basis to ensure that the level doesn‟t
change appreciably.
4.6.8
Voted LED
The green VOTED LED lights whenever the associated site has been selected as the site with
the best signal quality. When STARS TX steering is enabled the VOTED LED (and the
associated VOTE output) will remain active for the site selected until a new site is voted or the
function times out. The SVM-2 will flash this LED when the module is in the Select Mode.
4.6.9
Unsquelch (UNSQ) LED
The yellow LED lights whenever a signal capable of being voted is present on the associated
site. This indication will depend on the method of COR/pilot tone in use. In systems which use
external COR inputs this occurs when the receiver is unsquelched, driving the receiver‟s COR
output low. In sites using pilot tones, a signal is considered present when the pilot tone is
absent from the input audio. When squelched receivers are used and no external COR line is
available a signal is considered present when the audio input level rises above a preset
threshold. In systems with unsquelched receivers and no COR input line or pilot tone, signal is
considered present continuously, and the LED will always be on.
Regardless of the type of COR used, a site will never be voted if the associated SVM‟s UNSQ
LED is not lit since the SVM will not vote a site unless it determines that there is a signal
present on that site.
4.6.10
Transmit (TX) LED
This yellow LED is lit whenever the SVM‟s TX outputs are activated. This can be a discrete
PTT output or the placement of keying tones on the site‟s TX audio signal, whichever is
selected.
4.6.11
Fault LED
This red LED lights if the SVM fails its power-up test or if a line fault has been detected for the
site. The LED also flashes as a reminder whenever the site has been placed in the Disable
mode by the front panel switch or other means (remote control or rear panel input).
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