SELECTING A TONE CODE GUARD
The Tone Code Guard system (CTCSS) may be set for any frequency
in the range of 67 to 250.3 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 as
much as possible. RELM guarantees optimum receiver performance
only if tone frequencies below 220 Hz are chosen.
GROUP A
GROUP B
GROUP C
67.0
77.0
88.5
*100.0
107.2
114.8
123.0
131.8
141.3
*151.4
71.9
146.2
74.4
162.2
82.5
156.7
79.7
173.8
94.8
167.9
85.4
186.2
103.5
“179.9
91.5
203.5
100.9
192.8
218.1
*118.8
210.7
233.6
127.3
225.7
250.3
136.5
241.8
* 50/60 Hz power distribution systems could cause falsing.
The assignments in a given area shall be made from one of the
Groups A, B, or C as much as possible.
EPI 3101A User’s Manual
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Содержание EPI 3101A
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