User's Manual

CALL TYPES AND FEATURES
CALL TYPES
ENVOY™ TRANSCEIVER REFERENCE MANUAL 401
Channel Test call
If you want to test the suitability of a channel/mode before you use it to transmit voice
or data, make a Channel Test call to a specific station.
In an ALE/CALM HF network, a Channel Test call may be sent to an ALE address
using a Group Selective or NET address syntax (if you have the MIL-STD-188-141B
ALE option installed). Information from this call updates the information stored in the
LQA database for the called address using the same HF network for the current time
slot. The calling station automatically sends a beacon on each channel/mode
combination in the ALE/CALM HF network, recording local and remote BER and
SINAD information, and calculating an LQA score. The LQA screen is visible during
the Channel Test call, and at the end of the call, displays the best channel on which to
make the call.
A Channel Test call made in an ALE/CALM HF network that uses the text
SOUNDING as the call address may be used to initiate a sounding operation.
Transceivers that detect this sounding update the relevant information stored in their
LQA database.
In a Codan Selcall HF network, a Channel Test call sends a request to the station that
you want to call on the channel/mode you have selected. The called station
automatically returns an audible test signal (revertive). The volume and clarity of this
signal indicates the quality of the channel/mode.
NOTE: If you set up one of the status areas to show the Rx level, you can view
the strength of the revertive signal.
You can also test channels once you have started a call.
Table 47: Icons for ALE address syntax calls (MIL-STD-188-141B ALE)
ALE address syntax Icon See...
ALL ALL call on page 409
ANY ANY call on page 410
Group Selective Group Selective call on page 411
NET NET call on page 412
Wildcard Wildcard call on page 413