Operating instructions

DMH Series VHF Radio Installation and Programming
BK RADIO Page 2-19
2.4 CTCSS CHANNEL GUARD VALUES
The CTCSS Channel 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.
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.
2.5 CDCSS CHANNEL GUARD VALUES
Codes for the CDCSS Channel Guard system may be chosen from the following list. Since
there are no EIA standards for the performance or compatibility of CDCSS Channel Guard
systems it is recommended that an operational test be made on the intended system before
wholesale assignments are made. In some cases either or both transmit and receive codes
will require an inverted code to operate with existing systems. 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 systems 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