Motorola Micom 2 Manual

MICOM-2E-ALE Owner’s Manual
42
Keyboard Beep (KBBP)
This menu toggles between enabling and disabling the beep for the
keyboard (keypad).
Press
[YES] to enable the keypad
beep.
Press
[NO] to disable the keypad beep.
Press
to confirm,to cancel.
Tone
This menu sets the keyboard beep tone to high or low volume.
Press
[YES] to set to low volume.
Press
[NO] to set to high volume.
Press
to confirm,to cancel. 

Programming the Radio
43
Alternate Display Time-out (ADT)
This menu sets the time-out time of the menu display. You define the
number of seconds that elapse before the display returns to the
previous screen.
To set the time-out time:
1.Enter the Radio Programming menu (steps 1-4 on
page 29).
2.Press[PRMT].
3.Pressto scroll to the ADT option.
4.Press[ADT].
5.Press
Press
Press
Press[] to increment the displayed value by 1.
[1], to quick-set the value to 1.
[10], to quick-set the value to 10.
6.Press
 to...

MICOM-2E-ALE Owner’s Manual
44
Setting Radio Options
MICOM-2E offers three programmable radio options:
· Tuner (TUNE)
· Accessory (ACC)
· ALE
To set the radio option:
1.Enter the Radio Programming menu (steps 1-4 on
page 29).
2.Press[OPTS].
3.Press the function key beneath the option of your choice:
TUNE - toggles the tuner.
ACC - sets the accessory setting.
ALE - toggles ALE option on/off.
4.Press to confirm,to cancel. 

45
Automatic Link Establishment (ALE)
The MICOM-2E unit incorporates Automatic Link Establishment (ALE) to
select the best working channel from the channels programmed into the
unit automatically without user intervention. The ALE incorporates all
advanced data transmission techniques required by MIL-STD-188/141A
and FED-STD-1045. The ALE feature thus ensures the user of the best
possible link without requiring prior knowledge of radio communications.
Previously, HF radio operations had to be familiar...

MICOM-2E-ALE Owner’s Manual
46
Activating/Deactivating the ALE
The MICOM-2E implements Automatic Link Establishment (ALE) that
selects the best working channel from the available channels that are
programmed for use. Using ALE is highly recommended for users
because it ensures the best link possible without an in-depth knowledge
of radio communications. Pages 45-51 describe the ALE features in
greater detail.
To disable ALE:
1.Pressto obtain the Menu display.
2.Press
option.
to obtain the menu with the...

Automatic Link Establishment (ALE)
47
To enable ALE (after disabling):
1.Pressto obtain the Menu display.
2.Press
option.to obtain the menu with the PROG
3.Press[PROG].
4.Press
[RAD].
5.
Press  [OPTS] to enter Radio Programming
mode.
6.Press[ALE].
7.Press[YES] to enable ALE.
8.Press to confirm. 

MICOM-2E-ALE Owner’s Manual
48
LQA Memory
The ALE builds a database of connectivity information based on calls
and digital ALE “sounding” messages transmitted by other stations in
the network. This information is stored in a special “LQA memory” and
used to determine the link quality of all channels in the networks. The
data in LQA memory is “time-weighted”, that is, recent information is
given more value than old, thus compensating for changing propagation
conditions.
Automatic Sounding
Automatic...

Automatic Link Establishment (ALE)
49
To select the best sounding cycle time, the trade-offs must be
considered. On the one hand, a shorter cycle ensures a more updated
LQA memory; thus the channel with the highest LQA value will, in fact,
have the best link quality at that point in time. On the other hand, a
shorter sounding cycle increases network occupancy due to more
frequent sounding messages, leaving less channel-free time for the
users.
Figure 1 shows network occupancy in relation to sounding...

MICOM-2E-ALE Owner’s Manual
50
occupancy. A 60-minute cycle would result in 40% occupancy. A 90-
minute cycle would result in 27% occupancy. A 120-minute cycle would
result in 20% occupancy.
It can now be decided which sounding cycle is the best for any
particular network, taking into account the trade-offs described above.
Under field conditions, the occupancy will usually be less than the value
obtained from the chart because not every station receives all the
soundings that are being broadcast on all...

Automatic Link Establishment (ALE)
51
Bi-directional Handshake
The bi-directional handshake is a shorcut procedure to exchange LQA
scores with other stations in the system without establishing a link. This
procedure is useful in the following cases:
· The radio has only recently been switched on and an automatic
sounding cycle has not been completed yet.
· The operator wishes to update the LQA scores before initiating a call
to another station.
· When a new or passive station joins to the system.
· In...