6. Logic Table for operation
6.1 I/O Conditions
Output Pin
Input Pin Condition
Result/Function
Condition
DECODE
CTCSS
Tone in
Tone
Transmitter
Enabled
TX Audio
Path
Enabled
Tone
Decoder
Enabled
RX Audio
Path
Enabled
PTT
MONIT R
D0-D5
PTL
0
Notes
Tone
No Tone
Tone
0
0
1
1
1
1
0
X
0
X
X
0
0
1
1
1
1
0
0
Yes
Yes
Yes
No
No
No
No
No
No
No (bias)
No (bias)
No (bias)
Yes
1
2
No (bias)
No (bias)
No (bias)
No (bias)
No (bias)
No
No
Yes
X
0
Yes
Yes
Yes
Yes
3a
3b
4
Tone
1
0
Tone
X
X
o/c
o/c
Yes
No Tone
Yes
5
Table 3: Combinations of input/output conditions
Notes: o/c = Open circuit
X = don’t care
1. Normal tone transmit condition.
2. Notone programmed in TX mode, tone transmit O/P set to V /2. TX audio path enabled.
DD
3a. Normal decode standby.
3b. Normal decode standby with PTL used to enable audio.
4. Normal decode of correct CTCSS tone condition, PTL has no effect.
5. Notone programmed in RX mode, tone transmit O/P (o/c). RX audio path enabled.
6.2 CTCSS Programming
Tone
MX465
Frequency (Hz)
Programming Inputs, Switch (Solder Jumper)
Nominal
Frequency (Hz)
D5
(E6)
D4
D3
D2
D1
D0
Hex
ꢇ f (%)
0
(E5)
(E4)
(E3)
(E2)
(E1)
67.0
69.3
71.9
74.4
77.0
79.7
82.5
85.4
88.5
91.5
94.8
97.4
100.0
103.5
107.2
110.9
66.98
69.32
-0.029
0.024
0.001
0.042
-0.046
-0.029
-0.021
-0.020
-0.007
-0.048
-0.042
-0.036
-0.040
-0.069
-0.05
1
1
0
1
0
1
0
1
0
1
0
1
0
0
0
0
1
1
1
1
0
1
1
1
0
1
1
1
0
1
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
1
1
1
1
1
1
1
0
1
0
1
1
1
0
1
0
1
1
1
0
1
0
1
1
0
1
0
0
0
1
1
1
1
0
1
1
0
0
0
1
1
0
1
0
0
1
3F
39
71.901
74.431
76.965
79.677
82.483
85.383
88.494
91.456
94.76
1F
3E
0F
3D
1E
3C
0E
3B
1D
3A
0D
1C
0C
1B
97.435
99.96
103.429
107.147
110.954
0.049
Page 16
20480150.001 MX-COM ꢀ 1996
CMLMICRO [ CML MICROCIRCUITS ]
