Maas AHT-28-V, User Manual

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Function 2: TONE Search Scanning
In operating situations where you don’t know the CTCSS/DCS tone being used by
another station or stations, you can command the radio to listen to the incoming signal
and scan in search of the tone being used.
Enter Menu 31
st
/32
nd
to start CTCSS/DCS searching.
If the Tone scan feature does not detect a tone or code, it will continue to scan
indefinitely. When this happens, it may be that the other station is not sending any tone.
You can press PTT key to halt the scan at any time.
You also can press MONI key during Tone scanning to listen to the (muted) signal from
the other station. When you release the MONI key, Tone scanning will resume.
Tone Scanning works either in the VFO or MR modes.
Function 3: TONE Calling (1750Hz)
If the repeaters in your country require a 1750Hz burst tone for access (typically in
Europe), you can press and hold CALL key for 2s and transmitter will automatically be
activated, and a 1750Hz audio tone will be superimposed on the carrier. Once access
to the repeater has been gained, you may release CALL and use PTT key for activating
the transmitter.
22) VFO Step setting (STEP---MENU 29)
Functions: setting of the synthesizer steps
Enter Menu 29
th
to set VFO step.
Available Values: 5/6.25/10/12.5/25/50/100 kHz
23) Wide/Narrow band selecting (N/W---MENU 30)
Functions: setting of wide/narrow bandwidth
Enter Menu 30
th
to set bandwidth.
Available Values: Wide---25kHz/Narrow---12.5kHz
24) Voice Mode and Scrambler (SCR&APRO---MENU 33&34)
Functions: only 2/5 tone version has this function.
The transceiver has 8 groups of scrambler; it is accomplished by the addition of com-
ponents to the original signal in order to make extraction of the original signal difficult.
And its voice compand technology will make the voice more clearly in the noise
environment.
Enter Menu 33
rd
to set scrambler group.
Enter Menu 34
th
to set voice mode.
Available Values: OFF/COMP/SCRA
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