Document No. 8128000560
Software Revision – N1B (07 Oct 04)
7-72
RT-9000 B
At this point, the Initiating Station originating the call may do the following:
a) Repeat the Point-to-Point Call. Depressing the ‘ALE/*’ key at 1 as shown in Figure 7.3.4.13 will
cause the Feature Menu shown in Figure 7.3.4.13 to reappear. Depress ‘TX-ALE’ to repeat the Point-
to-Point call.
b) Repeat the Point-to-Point Call using a different Channel Group with different operating frequencies, if
available.
c) Place the RT-9000 B in ALE Receive scan and try to Link later. The Called station may be busy or
propagation unfavorable at this time.
d) Perform other ALE operations.
e) 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.
Figure 7.3.4.18 Link Quality Analysis Values vs. SINAD Values
7.3.4.4.2 Receiving a Point-to-Point Call
To receive an ALE Point-to-Point, the RT-9000 B must currently be in ALE Receive (‘RX-ALE’) mode and
scanning. The Channel Group currently selected should include all or most of the same frequencies being
used by the Initiating Station.
The following describes the sequence of events when receiving a Point-to-Point Call:
1. With the RT-9000 B -equipped Distant Station in ALE Receive (‘RX-ALE’) mode and scanning, the
RT-9000 B will stop scanning on the received frequency when it receives an ALE transmission. Non-
ALE transmissions on any frequency(s) in the Channel Group will only pass through during the brief
1/2 second scan interval but NOT cause the Receiver to stop scanning.
Displayed LQA Value
vs
SINAD Measurement
Displayed
LQA Value
dB
SINAD
Displayed
LQA Value
dB
SINAD
Displayed
LQA Value
dB
SINAD
11B11L21
22C12M22
33D13N23
44E14O24
55F15P25
66G16Q26
77H17R27
88 I18S28
99J19T29
10 K 20 U 30
Notes:
1. LQA = Link Quality Analysis
2. SINAD = Signal + Noise + Distortion - to - Noise + Distortion Ratio
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