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Make sure the power supplies used are sufficiently noise free. Also make sure there are no

unintended noise sources radiating into the test setup.

7.2 If you still need help

If you have read this section, reexamined your test setup, and still cannot figure out what is

wrong, please contact us for additional assistance. Please be ready to describe the problem or

symptoms and the steps you have taken to try to correct them. We can be reached at

MX-COM, Inc.

4800 Bethania Station Rd.

Winston-Salem, NC 27105-1201



telephone (910) 744-5050



telephone (800) 638-5577



fax (910) 744-5054

8. Retrofitting from older designs

The following is a brief list of differences between older generation MX-COM CTCSS

encoder/decoders and the MX465. For full details refer to each device’s individual data sheets.

8.1 Comparison Specifications

MX365

MX365A

MX165A

MX165B

MX165C

MX465

CTCSS

TONES

38 + No tone

37 = EIA 220

A

plus 97.4Hz

39 + No Tone

37 = EIA 220

B

plus 69.3Hz

& 97.4Hz

39 + No Tone

37 = EIA 220

B

plus 69.3Hz &

97.4Hz

39 + No Tone

39= TIA/EIA

603

47 + No Tone

39 = TIA/EIA

603 plus

159.8Hz,

183.5Hz,

189.9Hz,

196.6Hz,

199.5Hz,

206.5Hz,

229.1Hz,

254.1Hz

47 + No Tone

39 = TIA/EIA

603 plus

159.8Hz,

183.5Hz,

189.9Hz,

196.6Hz,

199.5Hz,

206.5Hz,

229.1Hz,

254.1Hz

Supply

Voltage

Min: 4.5V

Typ: 5.0V

Max: 5.5V

Min: 4.5V

Typ: 5.0V

Max: 5.5V

Min : 3.0V

Typ: 3.75V

Max: 4.5V

Min: 3.0V

Typ: 3.75V

Max: 4.5V

Min: 2.75V

Typ:

3.75/5.0V

Max: 5.5V

Min: 2.75V

Typ:

3.75/5.0V

Max: 5.5V

0dB ref

300mVrms

308mVrms

100mVrms

100mVrms

750mVrms

750mVrms

Composite

Signal

0dB 1kHz test

tone, -12dB

noise (band

limited 6kHz

gaussian

white noise), -

CTCSS tone.

0dB 1kHz test

tone, -12dB

noise (band

limited 6kHz

gaussian

white noise), -

CTCSS tone.

0dB 1kHz test

tone, -12dB

noise (band

limited 6kHz

gaussian

white noise), -

CTCSS tone.

1kHz test

tone at

300mVrms,

75mVrms

noise (band

limited 6kHz

gaussian

white noise),

30mVrms

CTCSS tone.

0dB 1kHz test

tone, -12dB

noise (band

limited 6kHz

gaussian

white noise), -

CTCSS tone.

0dB 1kHz test

tone, -12dB

noise (band

limited 6kHz

gaussian

white noise), -

CTCSS tone.