Zartek ZA-720, User Manual, Page: 10 / 15

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446 MHz Band 464 MHz Band
Channel (MHz) Channel (MHz)
1 446.00625 1a 463.975
2 446.01875 2a 464.125
3 446.03125 3a 464.175
4 446.04375 4a 464.325
5 446.05625 5a 464.375
6 446.06875
7 446.08125
8 446.09375
CTCSS standard tones 1-38
Code# (Hz) Code # (Hz) Code # (Hz)
1 67.0 14 107.2 27 167.9
2 71.9 15 110.9 28 173.8
3 74.4 16 114.8 29 179.9
4 77.0 17 118.8 30 186.2
5 79.7 18 123.0 31 192.8
6 82.5 19 127.3 32 203.5
7 85.4 20 131.8 33 210.7
8 88.5 21 136.5 34 218.1
9 91.5 22 141.3 35 225.7
10 94.8 23 146.2 36 233.6
11 97.4 24 151.4 37 241.8
12 100.0 25 156.7 38 250.3
13 103.5 26 162.2
Sub-tones
The Tone column shows the sub tone assigned for each frequency. There
are 50 QT (CTCSS quiet tones) and 210 DQT (digital quiet tones that can
be selected. These tones are used to privatize conversations and reduce in-
terference from other users on the same frequency. A CTCSS/QT/DQT tone
is a sub-audible tone which allows you to ignore (not hear) calls from other
parties who are using the same channel. When you receive a signal that
has a tone different from the one set up in your transceiver, you will not hear
the signal but only the LED will show frequency activity. Likewise, signals
that you transmit will only be heard by parties whose CTCSS/QT/DQT tone
matches the tone set up in your transceiver.
There are 38 CTCSS standard tones (1-38) plus 12 extra QT tones. The
38 tones are common on other 446 & 464MHz radios such as the Zartek
Pro8 or Pro5. If the tone is left “OFF”, the frequency is left “open” to receive
communication from any tone, but your transmitter will not be decoded by a
radio with a tone.