Kenwood TH-28A Instruction Manual page 29

6 Tone Operation
Some repeaters require a control signal to activate
them. Several different methods are currently in
use.
In the United States, sub-audible tones are
sometimes used. This transceiver will generate sub-
audible frequencies.
In Europe and the United Kingdom, a 1750 Hz tone
is used in transmitting. Simply press and hold the
TONE key to transmit the access code. You need
not press the PTT switch. A 1750 Hz tone encoder
is included with models delivered to Europe and the
United Kingdom.
Selecting Tone Frequencies
Press the F key, then press the TONE key. The
current tone frequency will appear on the display.
2 Rotate the tuning control to select the desired tone
frequency(Hz)
67.0 | 825 | 974 | 1148) 136.5 | 162.2 | 192.8 | 233.6
71.9 | 85.4 | 100.0 | 1188 | 141.3 | 167.9 | 203.5 | 241.8
74.4 | 88.5 | 103.5 | 123.0 | 146.2 | 173.8 | 210.7 | 250.3
77.0 | 91.5 | 107.2 | 127.3 | 151.4 | 179.9 | 218.1 | 1750
79.7 | 94.8 | 110.9 | 131.8| 156.7 | 186.2 | 225.7
Press the TONE key again or simply wait 10 seconds
for the transceiver to resume the previous mode.
Tone Function Operating
Press the TONE key. A " T" indicator appears on
the display, and the transmitter sends the desired
tone when you press the PTT switch.
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