HF radio transmission
NGT Transceiver Getting Started Guide
79
Networks and scanning
A network is two or more stations that use the same
frequencies and call system to communicate. The frequencies
are allocated by a government authority and enable the
network to maintain HF radio communications throughout the
day and night.
The call system is the method the network uses to make and
receive calls. For example, in networks that use the Codan
Selcall or Open Selcall call system to make calls, the user
enters the address of the station they want to call, then selects
the channel/mode on which to make the call. In networks that
use the ALE/CALM call system, the transceiver selects the
best channel/mode for the call.
The transceiver can be set to scan the channel/modes used by
your network to detect incoming calls. It is recommended that
scanning is switched on when you are not using the
transceiver to communicate. This ensures that you can receive
calls from stations in your HF radio communications network.
