•
DECODE
MODE
SCREENS
PL
CODE
FREQ.HZ
PL
CODE
FREQ.HZ
All decode screens have a "start" decode select. This will
XZ
67.0
4Z
136.5
start the specified decode and put the software into a
tight loop. This assures the best accuracy possible, but
WZ
69.3 4A
141.3
to
do
so, the analyzer ignores all switch selections and
key
entries except to go
to
the "menu"
or
to "end" the
146.2
'----
decode loop. During the decode loop, a
"DECODE"
XA
71.9
4B
message
appears
near
the
top
of
the
screen.
In
general,
a
WA
74.4
5Z
151.4
"0"
entry on the 2nd line
will
return the screen to menu,
a "1" entry starts a decode
or
will
reset a decode
in
proc-
XB
77.0
5A
156.7
ess, and a "2"
will
end the decode.
SIGNALING
SEQUENCE
MODE SEL) 4
WB
79.7
5B
162.2
0)
MENU I) START
2)
END
YZ 82.5
6Z
167.9
PL
DECODE
YA
85.4
6A
173.8
FREQ: 076.3
YB
88.5
6B
179.9
CODE: -
186.2
ZZ
91.5
7Z
FIGURE
3-22.
PRIVATE
LINE
DECODE
DISPLAY
ZA 94.8
7A
192.8
•
PL
DECODE
ZB
97.4
M1
203.5
Select Signaling Sequence DISPLAY. Monitor FUNC-
lZ
100.0
82
206.5
TION,
and
PL
Mode. Use special function control to
select the signal source for the decoder. The decoder ac-
1A
103.5 M2
210.7
cepts signal inputs from either the internal monitor
demodulator
output
or
from the Ext Mod In port. The
IB
107.2
M3
218.1
Analyzer decodes tone sequence,
PL
and
DPL
signals,
to determine the generating code. Figure 3-22 shows a
2Z
110.9 M4
225.7
page 4 display
of
a decoded
PL
frequency and code.
'---
Frequencies readout to a maximum 300
Hz
with
0.1
Hz
2A
114.8
9Z
229.1
resolution. The code
of
the nearest valid frequency will
be displayed. Dashes display
if
the frequency exceeds
2B
118.8
M5
233.6
the limit. Table
3-5
lists all valid
PL
codes and their fre-
quencies.
3Z
123.0
M6
241.8
3A
127.3
M7
250.3
3B
131.8
TABLE
3-5. VALID
PL
CODES
'--....---'
3-12
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