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.
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
CODE
EQUIVALENT
CODE
PRIMARY
CODE
EQUIVALENT
CODE
PRIMARY
CODE
EQUIVALENT
CODE
023
340,766
132
605,634,714
237
464,642,772
025
133
413,620
243
267,342
026
566
134
273
245
370,554
031
374,643
135
205,610
246
542,653
032
136
502,712
252
661
036
137
142
174,270
254
314,612,706
037
560,627
143
333
255
425
043
355
144
466,666
262
316,431,730
047
375,707
145
525
266
655
051
520,771
147
303,306,761
271
427,510,762
053
150
256,703
274
652
054
405,675
152
366,415
276
326,432
056
465,656
153
606,630
307
362,565
057
172
155
233,660
311
330,456,561
060
116,737
156
517,741
312
515,663,743
065
301
157
322,503
315
321,673
066
734
161
345,532
317
546,614,751
067
516,720
162
416,553
324
343,570
071
603,717,746
163
460,607,654
325
550,626
072
470,701
164
207,732
331
372,507
073
640
165
354
332
433,552
074
360,721
171
265,426
344
471,664,715
075
501,624
176
244,417
346
616,635,724
076
203,754
212
253
351
353,435
104
226,557
213
263,736
356
521
107
365
217
371,453,530
363
436,443,444,662
114
327,615
222
445,457,575
446
467,511,672
115
534,674
223
350,475,750
447
473,474,731,744
117
411,756
224
313,506,574
452
524,765
122
535
225
536
454
513,545,564
123
632,657
227
261,567
455
533,551
125
173
231
504,631,636,745
462
472,623,725
127
412,441,711
234
423,563,621,713
523
647,726
130
364,641
235
611,671,723
526
562,645
131
572,702
236
251,704,742
LBI-38653
LBI-38653
4
