The Control List
Manpack Transceiver 2110 series Reference Manual 263
LQA Screen entry
The LQA screen is automatically displayed when you make a Channel Test call in an
ALE/CALM network, and is accessed at other times via the LQA Screen entry in the
Control List. It enables you to display the most current LQA information for the best
channel. If you need to refer to this screen frequently, consider creating a hot key to
display it, or making it the home screen (for more information see page 337, Hot keys,
page 389, Example 2: displaying an information screen, and page 111, Setting the home
screen).
Figure 48: The LQA Screen entry in the Control List
The LQA screen contains information on the most recent LQA exchange that has
occurred. This may be due to a Channel Test call in an ALE/CALM network, a sounding,
or an ALE call.
The LQA score is an overall measure of the quality of the information between the two
stations for a particular channel/mode combination. This score is compared with the
ALE Call Threshold to determine whether or not the channel is suitable.
The local and remote BER/SINAD provide a measure of the effectiveness of data/voice
transmission on the channel. The BER may range from 0 (no errors) to 30. The
transceiver typically does not use channels with a BER > 12. The SINAD may range
from 0 (poor channel) to 30.
The channel/mode combination with the highest LQA score is displayed on the LQA
screen. The highest number of replies on a channel/mode is displayed with the number of
channels on which a response was received.
The information presented in the LQA screen reflects information in the LQA database,
and as such is affected by the ALE LQA Decay entry in the Control List.
NOTE
The LQA Screen entry is only displayed if the MIL-STD-188-141B ALE
option is installed (2110 only).
NOTE
LQA information derived from a sounding does not contain BER/SINAD
information from the remote site.
LQA score BER/SINAD
best channel
number of
channels tried
highest number
of responses
on a channel
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