Abell A720T, Service Manual

Page: 20 / 56

A720T (VHF) Service Manual V1.0
20/56
Default: Turn on
6.1.4 VOX
With voice instead of pressing the PTT key, use voice to control transmission by microphone.
6.1.5 TOT
To forbid long time channel occupation and to protect radio from being operated for long time transmitting.
6.1.6 High/Low Power Switch
Select High or Low power by programming.
6.1.7 Squelch Level
Squelch level from 0-9 can be chosen, level 1 is the shallowest which is easy to receive weak signal, level 9 is the
deepest which can receive stronger signal, and whose background noise is relatively less, interval of each grade is
about 1dbm, level 0 is out of control with squelch hysteresis.
6.1.8 Receive and Make Call
Select Area
Area is a channel group. This radio support 2 areas, there are max. 16 channels in each area
Steps:
Press pre-programmed area key.
You will hear a prompt “Di” tone, which means your radio has switched from area 1 to area 2; you will hear a
prompt “Di Di”tone, which means your radio has switched from area 2 to area 1.
6.1.9 Radio Channel, Radio ID and Group ID
Steps:
After the desired zone is set (if there are more than one zone),switch channel knob to choose channel, radio ID and
group ID.
Receive and Reply Call
Steps:
In channel,after you set the radio ID and group ID , you can receive call or call back.
Indicator LED bright red when radio is transmitting, bright green when radio is receiving signal.
Receive and Reply Group Call
Your radio must be set to belong to the group if you want to receive the group call.

Indicator LED bright green.

Hold radio and place it 1 to 2 inch away from your month at vertical position. If you turned on “Channel Free”
function when programming, after the caller released PTT key, you will hear a short prompt tone, which means
this channel is free for you to call back.

Press PTT key to speak. Indicator LED bright red.