Asynchronous calling
3G ALE HF networks rely on each station on the network having syncronised clocks. Time
synchronisation is achieved by using the signals from GPS satellites. If a radio is unable to receive
GPS signals, their clock will over time lose sync with the rest of the 3G ALE HF network and will
not be able to receive 3G ALE calls. If the station you are calling is not answering your call, it may
be that their radios clock is out of sync. An asynchronous call may allow you to make calls to a
station that is in this operational state.
Note: If you are unable to receive GPS signals on your radio, all calls that you make will
be made using asynchronous calling.
Note: If you are unable to get a GPS signal for an extended period, a TOD (Time of Day)
Request call can be made to the TOD master station to syncronise your radio clock.
To make an asynchronous call:
1. Press the key.
2. Press , then select Async.
3. Select a call type using the and keys.
4. Enter the address of the station you are calling.
5. Press the key.
6. Enter a text message or select a menu item if prompted.
7. Press to begin the call.
Making a 2G or 3G ALE call
Page 48 Sentry-H 6110-MP Operator Guide
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