Page 17

Tone

Programming Inputs, Switch (Solder Jumper)

Nominal

Frequency (Hz)

MX465

Frequency (Hz)

D5

(E6)

D4

(E5)

D3

(E4)

D2

(E3)

D1

(E2)

D0

(E1)

Hex

114.8

114.84

0.035

001011

0B

118.8

118.793

-0.006

011010

1A

123.0

123.028

0.023

001010

0A

127.3

127.328

0.022

011001

19

131.8

131.674

-0.095

001001

09

136.5

136.612

0.082

011000

18

141.3

141.323

0.016

001000

08

146.2

146.044

-0.107

010111

17

151.4

151.441

0.027

000111

07

156.7

156.875

0.112

010110

16

•

159.8

159.936

0.085

110001

31

162.2

162.311

0.069

000110

06

167.9

167.708

-0.114

010101

15

173.8

173.936

0.078

000101

05

179.9

179.654

-0.137

010100

14

•

183.5

183.680

0.098

110010

32

186.2

186.289

0.048

000100

04

•

189.9

190.069

0.089

110011

33

192.8

192.864

0.033

010011

13

•

196.6

196.329

-0.138

110100

34

•

199.5

199.312

-0.094

110101

35

203.5

203.645

0.071

000011

03

•

206.5

206.207

-0.142

110110

36

210.7

210.848

0.070

010010

12

218.1

217.853

-0.113

000010

02

225.7

225.339

-0.160

010001

11

•

229.1

229.279

0.078

110111

37

233.6

233.359

-0.103

000001

01

241.8

241.970

0.070

010000

10

250.3

250.282

-0.007

000000

00

•

254.1

254.162

0.024

111000

38

Notone

N/A

110000

30

Serial input mode

N/A

1

0

Data

Clock

X

X

2X

•

Not specified in the TIA/EIA tone set

Table 4: CTCSS Tones

7. Troubleshooting

Ideally, this section would not be required...however, sometimes the least expected (OK, the

undesired) occurs. This section is intended to answer the most common questions and provide

some helpful troubleshooting suggestions.

7.1 Suggestions



Use an oscilloscope

Because transmit and receive are biased a.c. signals, an oscilloscope is an invaluable

troubleshooting tool to probe and verify signal levels



Check for loose connections or jumpers