RELM SMX920, Техническое руководство

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SMX920 Base Station & Repeater Technical Manual
RELM/
BK RADIO
4
incoming signals will override the Squelch and be heard in the speaker.
When CTCSS is enabled the channel remains quiet until someone
transmits using the same tone. Should the receiver be setup for the
reception of a signalling tone, the '
Green RX LED ' lamp with be on, also
if it contains the correct tone the ' Yellow Tone LED ' lamp will be lit, and
audio out of the speaker will then be heard. When the transmission ends,
the channel becomes quiet again. By using different tones, several groups
of people can share the same channel without disturbing each other.
NOTE: If an incoming signal is very weak and is close to the minimum
squelch level, it may become broken or “chopped” by the squelch action.
To prevent this, simply open the squelch to allow the signal to be heard
clearly. Alternatively, you can reduce the squelch sensitivity as described
above to block out unintentional weak signals.
♦
Front panel Channel Change Control
Refer to Section 2.2.1.3 for channel select method.
Table 1-1 below explains the functions of the front panel LED's. Each LED indicates
the status of the SMX920 in real time. As the LEDs are also software programmable,
it is also best to check the settings in software.
LED COLOR FUNCTION
POWER BLUE Indicates the power supply voltage is within
limits. A flashing display indicates that
battery operation is current. No display
indicates the voltage is not normal.
RX AQUA A signal is being received by the receiver or
the receivers squelch is open.
TX RED The transmitter is transmitting RF power.
TONE YELLOW A valid Continuous Tone Coded Squelch
Signal (CTCSS) or Digital Coded Squelch
(DCS) or 5 Tone signal has been detected.
ALARM ORANGE A prearranged alarm condition exists.
REPEATER GREEN The local repeater mode has been activated
Table 1-1 LED Functions
Switch FUNCTION
REPEATER Selects local Repeater mode
ACCESSORY Software programmable
Table 1-2 Switch Functions