ICOM 242700 用户手册

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1

PANEL DESCRIPTION

DURING FM/WFM OPERATIONS:

VOX FUNCTION (p. 85)

➥Push momentarily to toggle the VOX func-

tion ON and OFF.

• “

” appears when the VOX function is

ON.

➥Push and hold for 1 sec. to enter the VOX

set mode.

• The VOX gain, ANTI-VOX, VOX delay and

VOX gain can be set in VOX set mode.

✔ What is the VOX function?

The VOX function (voice operated transmission) activates
the transmitter when you speak into the microphone; then,
automatically returns to receive when you stop speaking.

SPEECH COMPRESSOR (p. 89)

➥Push momentarily to toggle the speech

compressor ON and OFF.

• “

” appears when the speech compres-

sor is ON.

➥Push and hold for 1 sec. to enter the com-

pression level set mode.

• Speech compression can be adjusted in

compression level set mode.

AGC (p. 76)

➥Push to change the time constant of the

AGC circuit.

• “

,” “

” or “

” appears when

the fast time constant, middle time constant
or slow time constant is selected, respec-
tively.

➥Push and hold for 1 sec. to enter the AGC

set mode.

• “

” (OFF) can be selected.

TBW (p. 86)

➥Push momentarily to indicate the selected

TX filter width.

• The popup indicator appears.

➥Push and hold for 1 sec. to toggle the TX

filter width between narrow, middle or
wide.

• The following filters are specified as the de-

fault. Each filter width can be set in the quick
set mode. (pgs. 123, 124)

WIDE

: 100 Hz to 2900 Hz

MID

: 300 Hz to 2700 Hz

NAR

: 500 Hz to 2500 Hz

BREAK-IN FUNCTION (p. 87)

➥Push momentarily to select semi-break-in,

full break-in (QSK) and break-in OFF.

• “

” or “

” appears when selecting

semi break-in or full break-in, respectively.

• An external switch, such as a foot switch,

must be connected to the ACC socket (pin 3,
pin 7 or RTTY SEND—see p. 23) if break-in
is turned OFF.

➥Push and hold for 1 sec. to enter the

break-in delay time set mode.

✔ What is the break-in function?

Full break-in (QSK) activates the receiver between transmit-
ted dots and dashes. This is useful when operating in nets,
or during DX pile-ups and during contests, when “fast re-
sponses” are common.

Push to toggle the 1/4-speed tuning func-
tion ON and OFF in CW and RTTY
modes.

• When the 

1

⁄

4

function is ON, “

” appears

and fine tuning can be used.

DUPLEX FUNCTION (p. 63)

➥Push to select the duplex transmit offset

direction or turn the function OFF.

➥Push and hold for 1 sec. to turn the one-

touch repeater function ON/OFF.

➥Push momentarily to set the subaudible

tone encoder for repeater use, tone
squelch function, DTCS and OFF.

• “

” appears when the repeater tone

function is ON. (p. 63)

• “

” appears when the tone squelch func-

tion is ON. (p. 60)

• “

” appears when the DTCS squelch

function is ON. (p. 62)

➥Push and hold for 1 sec. to enter the tone

frequency or DTCS code set mode. (pgs.
60, 62)

• Tone scan function is also available. (p. 61)

➥Push and hold to transmit a 1750 Hz tone

when pushing and holding 

[PTT]. (p. 67)

Push to turn the 9600 bps data transmis-
sion mode  ON and OFF. (p. 118)

9600

TON

DUP

1/4

BRK

TBW

AGC

COM

VOX

VOX

DUP

TON

9600