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Tone
CTCSS
number
freq.(Hz)
01h
67
02h
71.9
03h
74.4
04h
77
05h
79.7
06h
82.5
07h
85.4
08h
88.5
09h
91.5
0Ah
94.8
0Bh
97.4
0Ch
100
0Dh
103.5
0Eh
107.2
0Fh
110.9
10h
114.8
11h
118.8
CTCSS Frequency vs. Tone Numbers Table
Ex: TX mode, Input = MIC, Output = MOD & SMOD, Sub-tone = CTCSS, CTCSS
tone=01h
CTCSS Tx mode Setup Flow:
Flow description:
<82B01>: Setup the sub-tone channel by selecting the first group of the CTCSS channel.
<81E37>: Enable the DAC1, DAC2, AMP1, AMP2, MIC and PGA circuits. DAC1, AMP1
on- enable the MOD output. DAC2, AMP2 on- enable the SMOD output. MIC on– enable
the microphone circuit. PGA on– enable the PGA input source.
<81B10>: Select the PGA and audio input source locations. Select the PGA input source
to be MIC and audio out to be DAC common-mode bias so as to reduce noise.
<81142> Enter the Tx mode. Select the Tx mode and enable the Sub-tone = CTCSS
function.
HT98R068 Two-way Radio MCU
Tone
CTCSS
number
freq.(Hz)
12h
123
13h
127.3
14h
131.8
15h
136.5
16h
141.3
17h
146.2
18h
151.4
19h
156.7
1Ah
162.2
1Bh
167.9
1Ch
173.8
1Dh
179.9
1Eh
186.2
1Fh
192.8
20h
203.5
21h
210.7
22h
218.1
16
Tone
CTCSS
number
freq.(Hz)
23h
225.7
24h
12205
25h
241.8
26h
250.3
27h
69.3
28h
62.5
29h
159.8
2Ah
165.5
2Bh
171.3
2Ch
177.3
2Dh
183.5
2Eh
189.9
2Fh
196.6
30h
199.5
31h
206.5
32h
229.1
33h
254.1
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