Document No. 8128000560
Software Revision – N1B (07 Oct 04)
7-79
RT-9000 B
All responses and associated Link Quality Analysis (LQA) values will automatically be stored in memory for
future use. After all responses (if any) are finished, the RT-9000 B will broadcast an acknowledgement and
establish a Link. General traffic may be passed at this time.
Figure 7.3.4.28 ALE ‘NET CALL’ – Initiating Station – ‘Transmit Scan Terminated’ Display
After the NET CALL process is finished, the Operational Display will appear as shown in Figure 7.3.4.28. The
RT-9000 B will remain on the same frequency (Channel) used for the NET CALL but the ALE system in an
inactive state. The following message will appear in the Operational Display:
‘TX-SCAN TERMINATED’
The Feature Menu will appear as shown in Figure 7.3.4.14. At this point, the Initiating Station originating the
NET CALL may do the following:
a) Repeat the NET CALL. Depressing the ‘NET CALL’ key at 12 will re-transmit the NET CALL on the
same frequency (Channel).
b) Repeat the NET CALL on a different frequency (Channel). Manually select a new Channel by rotating
the ‘TUNING’ knob. Depress the ‘NET CALL’ key again to repeat the NET CALL.
c) Perform other ALE operations.
d) Leave ALE Operating mode and return to the Main Menu. Depressing the ‘END’ key will cause the
RT-9000 B to immediately leave ALE mode, return to the Main Menu, and resume normal operation.
7.3.4.6.2 Receiving a NET CALL
To receive an ALE NET CALL, the RT-9000 B must currently be in ALE Receive (‘RX-ALE’) mode and
scanning. The Channel Group currently selected must contain, as a minimum, the same frequency being
used by the Initiating Station to transmit the NET CALL.
A better practice would be to have the selected Channel Group contain all of the same frequencies being
used by the other Network stations. This suggestion is based on the fact that prevailing signal propagation
conditions might require the NET CALL be re-transmitted on more than one frequency to reach the intended
Network stations. Network stations must be prepared to use alternate frequencies.
Figure 7.3.4.29 shows the RT-9000 B response when initially receiving a NET CALL. The RT-9000 supports
multiple-network capability and will append the RT-9000 B ’s local ALE Network Number where the Initiating
station’s CALL ID resides to the “NC” Operation Indicator.
RC
MHZ
FUNCTION/
STATUS
CH 0314.21200
T
-SCAN TERMINATED
METER
S3 S6 S9 +20 +40 +60
20 60 100 150 FWD
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