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7. tone frequency selection, Tm-221a/321a/421a/521a only), 8. tone squelch (ctcss) – Kenwood TM-521E User Manual

Page 17: 8-2. to open the tone squelch of a distant station, Tone squelch (ctcss)

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4-7. TONE FREQUENCY SELECTION

(TM-221A/321A/421A/521A only)

1. To select the Tone Frequency press the M.IN key

and then the TONE key. The Display Panel will
indicate a Tone Frequency. Whenever the M.IN
key is pressed, the M indicator will turn on. You
must complete the desired action within 5
seconds, or the M indicator will turn off. If the in­
dicator goes off, you must press the M.IN key

again.

2.

Select the desired Tone Frequency using the

UP/DWN switches on the microphone or the

TUNING control.

Available CTCSS Tone Frequencies

Hz

Hz

Hz

67.0

114.8

192.8

71.9

118.8

203.5

74.4

123.0

210.7

77.0

127.3

218.1

79.7

131.8

225.7

82.5

136.5

233.6

85.4

141.3

241.8

88.5

146.2

250.3

91.5

151.4

94.8

156.7

97.4

162.2

100.0

167.9

103.5

173.8

107.2

179.9

110.9

186.2

Press any key or the PTT switch on the
microphone to return to the receiver frequency

display. A tone will be transmitted whenever the

PTT switch is depressed.

4-8. TONE SQUELCH (CTCSS)

(TM-221A/321A/421A/521A only)

4-8-1. Tone Squelch Operation Initiated by the Dis­

tant Station.

Note:-----------------------------------------------------------------------------

This function requires the use of the optional TSU-5

Programmable Tone Decoder Unit.

This function allows you to remain squelched until
the proper Tone Frequency is received. If you are on

a busy repeater this can be quite an aid.

1.

Press the CTCSS key. The CTCSS indicator will

light in the Display Panel.

2.

Your radio will now remain squelched until the

proper code is received. You should ensure all

the stations you wish to communicate with use
the same Tone Frequency. Please note that the

97.4 Hz Tone does not function for decode pur­
poses. Please see Section 4-7 TONE FREQUEN­
CY SELECTION for programming the CTCSS

Tone Frequency.

3.

To release the Tone Squelch function (normal

noise activated squelch), press the CTCSS key
again. The CTCSS indicator should go out on the

Display Panel.

4-8-2. To Open the Tone Squelch of a Distant Sta­

tion

Even if the optional TSU-5 Programmable Tone
Decoder Unit is not installed, your radio can open the

Tone Squelch of a distant station.

1.

Press the CTCSS key. The CTCSS indicator will

light in the Display Panel.
Select the same Tone Frequency between the

stations you wish to communicate. See Section
4-7 TONE FREQUENCY SELECTION.

Press the microphone PTT switch.

To release the Tone Squelch function, press the

CTCSS key again. The CTCSS indicator should
go out on the Display Panel.

2.

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