Installation and Programming GPH-CMD VHF Radio
Page 2-16 BK RADIO
2.3 TONE CODE GUARD VALUES
The Tone Code Guard system may be set for any frequency in the range of 67 to 255.9 Hz.
However, since most systems adhere to the Electronic Industry Association (EIA) standards,
tones should be selected from the following EIA list. In order to insure optimum performance, tone
selection for use on the same radio frequency (RF) channel or adjacent channels in the same
coverage area should be made from one of the Groups A, B, or C to the maximum degree
possible. BK Radio guarantees optimum receiver performance only if tone frequencies below
220 Hz are chosen.
GROUP A GROUP B GROUP C
67.0 (XZ)
77.0 (XB)
88.5 (YB)
*100.0 (1Z)
107.2 (1B)
114.8 (2A)
123.0 (3Z)
131.8 (3B)
141.3 (4A)
*151.4 (5Z)
162.2 (5B)
173.8 (6A)
186.2 (7Z)
203.5 (M1)
218.1 (M3)
233.6
250.3
71.9 (XA)
82.5 (YZ)
94.8 (ZA)
103.5 (1A)
110.9 (2X)
*118.8 (2B)
127.3 (3A)
136.5 (4Z)
146.2 (4B)
156.7 (5A)
167.9 (6Z)
*179.9 (6B)
192.8 (7A)
210.7 (M2)
225.7 (M4)
241.8
74.4
79.7
85.4 (YA)
91.5 (ZZ)
* 50/60 Hz power distribution systems could cause falsing.
The assignments in a given area shall be made from within one of the Groups: A, B, or C.
2.4 DIGITAL CODE GUARD VALUES
Codes for the Digital Code Guard system may be chosen from the following list. This can be done
during the code programming of the system. Usually systems using direct unit to unit
transmission (systems without mobile relays, repeaters, remote control, etc) may use codes from
the table. Systems with relays etc. may use code variations for system control and operational
efficiency. The system operator or engineer should be consulted regarding the operational
requirement on such systems.
023 065 131 165 245 315 411 466 612 703
025 071 132 172 251 331 412 503 624 712
026 072 134 174 261 343 423 506 627 723
031 073 143 205 263 346 431 516 631 731
032 074 152 223 265 351 432 532 632 732
043 114 155 226 271 364 445 546 654 734
047 115 156 243 306 365 464 565 662 743
051 116 162 244 311 371 465 606 664 754
054 125
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