Bedienungsanleitung Icom IC-756PROII (Seite 7 von 88) (Englisch)

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PANEL DESCRIPTION

➥ Transfers the memory contents to VFO when

pushed for 1 sec. (p. 54)

@8 MAIN/SUB CHANGE SWITCH [CHANGE]

➥ Switches the frequency and selected memory

channel between main and sub readouts when

pushed.

•Switches between transmit frequency and receive fre-

quency when the split frequency function is ON.

(p. 32)

➥ Equalizes the sub readout frequency to the main

readout frequency when pushed for 1 sec.

@9 MULTI-FUNCTION SWITCHES

Push to select the functions indicated in the LCD

display to the right of these switches.

•Functions vary depending on the operating condition.

➥ Switches the antenna connector selec-

tion between ANT1 and ANT2 when

pushed. (p. 46)

➥ Switches the [RX ANT]

(receive antenna)

ON and OFF when pushed for 1 sec.

•When the receive antenna is activated, the

antenna which is connected to the [ANT1] or

[ANT2] is used for transmit only.

When a transverter is in use, this [ANT]

does not function and ‘XVERT’ appears.

➥ Selects RF power (Po), SWR, ALC or

COMP metering during transmit. (p. 36)

➥ Switches the multi-function digital meter

ON and OFF when pushed for 1 sec.

➥ Selects one of 2 receive RF preamps or

bypasses them. (p. 37)

•“P. AMP1” activates 10 dB preamp.

•“P. AMP2” activates 16 dB high-gain preamp.

✔

What is the preamp?

The preamp ampliﬁes received signals in the front end cir-

cuit to improve the S/N ratio and sensitivity. Select “P. AMP1”

or “P. AMP2” when receiving weak signals.

➥ Selects 6 dB, 12 dB or 18 dB attenuator,

or bypasses them.

✔

What is the attenuator?

The attenuator prevents a desired signal from distorting

when very strong signals are near the desired frequency, or

when very strong electric ﬁelds, such as from a broadcast-

ing station, are near your location.

➥ Activates or selects fast, middle or slow

AGC time constant when pushed. (p. 30)

•“FAST” is only available for FM mode.

➥ Enters the AGC set mode when pushed

for 1 sec. (p. 30)

AGC time constant can be set between 0.1 to

8.0 sec.

(depends on mode), or turned OFF. While

“OFF” is selected, the S-meter does not function.

✔

What is the AGC?

The AGC controls receiver gain to produce a constant audio

output level, even when the received signal strength is varied

by fading, etc. Select “FAST” for tuning and select “MID” or

“SLOW” depending on the receiving condition.

➥ Turns the VOX function ON and OFF

when pushed in non-CW modes. (p. 35)

➥ Enters the VOX set mode when pushed

for 1 sec. in non-CW modes. (p. 35)

✔

What is the VOX function?

The VOX function (voice operated transmission) starts trans-

mission without pushing the transmit switch or PTT switch

when you speak into the microphone; then, automatically re-

turns to receive when you stop speaking.

➥ Selects semi break-in, full break-in oper-

ation, or turns the break-in operation

OFF when pushed in CW mode.

✔

What is the break-in function?

The break-in function switches transmit and receive with CW

keying. Full break-in (QSK) can monitor the receive signal

during keying.

➥ Turns the RTTY filter ON and OFF in

RTTY mode. (p. 28)

•When the RTTY filter is turned ON, [TWIN

PBT] functions as the IF shift control.

➥ Enters the RTTY filter set mode when

pushed for 1 sec. in RTTY mode. (p. 28)

✔

What is the IF shift?

The IF shift function electronically changes the center of the

IF (Intermediate Frequency) passband frequency to reject in-

terference. Only the inner control of [TWIN PBT] can be used

for the IF shift control.

➥ Turns the speech compressor ON and

OFF in SSB mode. (p. 37)

➥ Switches the narrow, middle or wide

transmit ﬁlter when pushed for 1 sec.

✔

What is the speech compressor?

The speech compressor compresses the transmitter audio

input to increase the average audio output level. Therefore,

talk power is increased. This function is effective for long dis-

tance communication or when propagation conditions are poor.

➥ Turns the

⁄

4 function ON and OFF in

SSB data, CW and RTTY modes. (p. 24)

•

⁄4 function sets dial rotation to

⁄4 of normal

for ﬁne tuning.

➥ Switches the tone encoder, tone squelch

function and no tone operation when

pushed in FM mode. (pgs. 47, 48)

➥ Enters the tone set mode when pushed

for 1 sec. in FM mode. (pgs. 47, 48)

BK-INBK-IN

OFFOFF

VOXVOX

OFFOFF

AGCAGC

MIDMID

ATTATT

OFFOFF

P.AMPP.AMP

OFFOFF

METERMETER

PoPo

ANTANT

RTTYRTTY

FILFIL

OFFOFF

COMPCOMP

OFFOFF

WIDEWIDE

1/41/4

OFFOFF

TONETONE

IC-756PROII.qxd 02.1.8 15:51 Page 5

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