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LBI-38653
Talkaround
Radio to radio direct communication is possible on a
per-channel basis. This is direct communication without the
use of a repeater.
Automatic Number Identification (A.N.I.)
As an option, one ID number per radio is programmed on
a per channel basis. The microprocessor generates the special
1600 Hz A.N.I. signal which is coded with a 4-bit phase
reversing code. It is sent at a 400 baud rate as part of the
handshaking preamble to a repeater just after PTT has been
pressed, or alternatively just after release of the PTT key.
A.N.I. is received and optionally demodulated by the repeater
as part of the system protocol when so installed.
Receive-Only Operation
Channels can be programmed to a receive-only operation.
Channels cannot be programmed for Transmit-only operation.
Busy Channel Lock Out
With Busy Channel Lock Out programmed, the radio
cannot transmit on a channel already busy. If the channel is
busy, fast pulsing beeps will sound (without stopping), until
the PTT switch is released. The radio must be programmed for,
and receiving, the correct Channel Guard. The combination of
Channel Guard and Busy Channel Lock Out prevents the user
from talking on a channel that is already in use (busy).
When the Busy Channel Lock Out option is enabled
without programmed Channel Guard, the user is prevented
from transmitting over a channel until there is no carrier
present in the channel.
Minimum Volume Level
The Front Panel VOLUME controls permit adjustment of
the audio level. Minimum levels are programmable. This
feature prevents missed calls due to a low volume level.
Power Level
Incremental transmitter power level change can be pro-
grammed to permit setting the output power to rated value. The
selected power level will be used for all channels.
4
Digital Channel Guard
Channel Guard provides a means of restricting calls to
specific radios through the use of a continuous tone coded
squelch system (CTCSS), or a multi-code digital squelch
system (DCG). Tone frequencies range from 67 Hz to 210.7
Hz. There are 83 standard programmable digital codes.
The Channel Guard tone frequencies and codes are soft-
ware programmable. Both tone frequencies and digital codes
may be mixed on each channel. The frequencies and codes are
shown in Tables 1 and 2. A Channel Number display that does
not flash, indicates that Channel Guard is enabled, or that
Channel guard is not programmed. A flashing Channel Num-
ber indicates that Channel Guard is programmed and disabled.
Table 1 - Channel Guard Tone Frequencies
Standard Tone Frequencies In Hertz
67.0
82.5
97.4
114.8
136.5
162.2
192.8
71.9
85.4
100.0
118.8
141.3
167.9
203.5
74.4
88.5
103.5
123.0
146.2
173.8
210.7
77.0
91.5
107.2
127.3
151.4
179.9
79.7
94.8
110.9
131.8
156.7
186.2
EXTERNAL SPEAKER (Optional)
The power connector provides a place to connect an
external speaker. The internal speaker must be disconnected
when an external speaker is used.
BATTERY POWER
The vehicle 12 volt battery with negative ground is all that
is required for operation of the radio. A cable connects the
battery to a male connector mounted on the back of the radio.
EASY ACCESSIBILITY
The radio circuitry is mostly contained on a single Main
Board, with the exception of the PA Board and the Front Panel
Board. Access to the Main Board and the inside of the radio is
easy with the removal of the top and bottom covers with two
screws each. Then the few adjustment controls (most are
adjusted with PC programming) can be easily reached. Four
more screws will permit removal of the front panel, giving
access to the Front Panel Board along with the switch and
indicator circuitry.
Table 2 - Primary and Equivalent Digital Codes (OCTAL)
PRIMARY
EQUIVALENT
PRIMARY
CODE
CODE
CODE
023
340,766
132
025
133
026
566
134
031
374,643
135
032
136
036
137
142
037
560,627
143
043
355
144
047
375,707
145
051
520,771
147
053
150
054
405,675
152
056
465,656
153
057
172
155
060
116,737
156
065
301
157
066
734
161
067
516,720
162
071
603,717,746
163
072
470,701
164
073
640
165
074
360,721
171
075
501,624
176
076
203,754
212
104
226,557
213
107
365
217
114
327,615
222
115
534,674
223
117
411,756
224
122
535
225
123
632,657
227
125
173
231
127
412,441,711
234
130
364,641
235
131
572,702
236
EQUIVALENT
PRIMARY
EQUIVALENT
CODE
CODE
CODE
605,634,714
237
464,642,772
413,620
243
267,342
273
245
370,554
205,610
246
542,653
502,712
252
661
174,270
254
314,612,706
333
255
425
466,666
262
316,431,730
525
266
655
303,306,761
271
427,510,762
256,703
274
652
366,415
276
326,432
606,630
307
362,565
233,660
311
330,456,561
517,741
312
515,663,743
322,503
315
321,673
345,532
317
546,614,751
416,553
324
343,570
460,607,654
325
550,626
207,732
331
372,507
354
332
433,552
265,426
344
471,664,715
244,417
346
616,635,724
253
351
353,435
263,736
356
521
371,453,530
363
436,443,444,662
445,457,575
446
467,511,672
350,475,750
447
473,474,731,744
313,506,574
452
524,765
536
454
513,545,564
261,567
455
533,551
504,631,636,745
462
472,623,725
423,563,621,713
523
647,726
611,671,723
526
562,645
251,704,742
LBI-38653
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