User manual

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DETAILED FUNCTION DESCRIPTIONS

1) Scan & Scan Mode setting (SCAN&SCANS---MENU 1&17)

Functions: under VFO/MR/CH mode, the transceiver allows you to scan the entire

current operating band and memory channels.

Enter Menu 1

and press [ ] key to start scanning.

When you have started scanning, press [ ] / [ ] key to change direction. And it

will halt on a signal it encounters, press PTT key to stop scanning; Press MONI key to

stop scanning temporarily; Press [ ] key again to exit the scanning function.

Scanning operation is basically the same in each of the above modes. Before you begin,

take a moment to select the way in which you would like the scanner to halt on a signal.

Enter Menu 17

to set scan mode. Default: TO.

Three options for the scan mode are available under VFO mode:

TO: In this mode, the scanner will halt on a signal it encounters, and will hold there for

some time. If you do not take action to disable the scanner within the time period,

the scanner will resume even if the stations are still active.

CO: In this mode, the scanner will halt on a signal it encounters, and will hold there if

the stations are still active. And after the carrier has dropped, the scanner will

resume.

SE: In this mode, the scanner will halt on a signal it encounter, it will not restart

automatically; you must manually re-initiate scanning if you wish to resume.

2) Priority Transmit (TX.SEL---MENU 2)

Functions: The AHT-28-V/AHT-78-U allows you to transmit on the sub band even if you

are working on the operating band.

Enter Menu 2

to select priority transmit band. Default: EDIT.

EDIT: It will transmit on the operating band.

BUSY: It will transmit on the band last talking used.

3) VOX Level & VOX Switch (VOX&VOX.SW---MENU 3&13)

Functions: the VOX function provides automatic transmit/receive switching based on

voice input to the microphone. With the VOX switch ON, you do not need to

press PTT switch in order to transmit, and it is not necessary to use a VOX

headset in order to utilize VOX operation.

Enter Menu 13

to set VOX switch. Default: OFF.

When the VOX is activated, the “VOX” icon will appear on the display.

Enter Menu 3

to set VOX level. It has 8 grades.

The higher level is, the more sensitive will be.

The AHT-28-V/AHT-78-U provides for adjustment of “Hang-Time” of the VOX (the

transmit-receive delay after the cessation of speech) via program software.

Default: 2s.