Abell A720T, Service Manual

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A720T (VHF) Service Manual V1.0
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low battery warning tone every 3 seconds.
Warning tone in second stage: When battery voltage is lower than 5.8V±0.1, transmitting will be prohibited and
radio give low battery warning tone. When you release PTT key, radio will turn to receive mode, indicator LED
flash red.
6.2 Configurations
6.2.1 Squelch Level
You can adjust radio squelch level to filter unwanted call with low RSSI or any channel who’s background noise is
too high.
Steps:

Press pre-programmed function key to active Squelch function.

You’ll hear a prompt “Di” tone, which means that radio is under high level squelch; Radio is under normal
squelch when you hear a prompt “Di Di” tone.
6.2.2 High/Low Power Switch
You can set high/low power for each channel.
You’d better set high power for long distance communication and low power for short distance communication.

Press pre-programmed Power Switch function key to switch between high and low power.

You will hear a prompt “Di” tone, which means that radio is under low power status; Radio is under high
power status when you hear a prompt “Di Di” tone.
6.2.3 VOX
This function allows you to hands free call in pre-programmed channels. When you are wearing VOX earpieces,
radio can detect your voice and start to transmit your voice automatically.
You can quit VOX by pressing PTT key. You need to do following steps if you need to active VOX function again:
Reboot the radio, or change channel by channel knob or do following steps:
Note: Please contact your dealer for any information of VOX.
Steps:
Press pre-programmed VOX function key to active/prohibit this function.
6.2.4 Prompt Tone Turn On/Off
If necessary, you can turn on/off radio prompt tone, except incoming call urgent prompt.
Steps:

Press pre-programmed function key.

You will hear a “Di” tone, which means prompt tone function turned on; radio prompt tone turned off when
you hear a “Di Di” tone.
6.2.5 Check Battery Charging Status
When desk charger indicator LED shows yellow, battery is charging, green for fully charged.