Specifications

SMX920 Base Station & Repeater Technical Manual

RELM/ BK RADIO

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