35
4
RECEIVE AND TRANSMIT
2001 NEW 2001 NEW
■ Operating RTTY (FSK)
Before operating RTTY, be sure to consult the manual
that comes with your TNC.
q Push a band key to select the desired band.
w Push [CW/RTTY] several times to select RTTY.
• After RTTY mode is selected, push [CW/RTTY] for
1 sec. to toggle RTTY and RTTY-R modes.
e Rotate [AF] to set audio to a comfortable listening
level.
r Rotate the tuning dial to tune a desired signal.
• S-meter indicates received signal strength.
•If the received signal cannot be demodulated, try select-
ing RTTY-R mode.
t Push [TRANSMIT] to set the transceiver to the
transmit condition or transmit a SEND signal from
your TNC.
• The TX indicator lights red.
•
The Po meter indicates transmitted RTTY signal strength.
y Operate the connected PC or TNC (TU) to transmit
RTTY (FSK) signals.
• Adjust [MIC GAIN] at this step, if necessary.
u Push [TRANSMIT] to return to receive.
Band keys[TX] indicator[TRANSMIT]
[CW/RTTY] Tuning dial
“RTTY” or “RTTY-R” appears
DD
Convenient functions for receive
• Preamp and attenuator (p. 47)
➥ Push [P.AMP/ATT] several times to set the pre-
amp OFF, preamp 1 ON or preamp 2 ON.
•“P.AMP1,” “P.AMP2” or “P.AMP” appears when the
preamp 1, preamp 2 or preamp is set to ON, respec-
tively. (depending on operating frequency band)
➥ Push [P.AMP/ATT] for 1 sec. to set the attenuator
ON.
•Push [P.AMP/ATT] momentarily to turn the attenuator
OFF.
•“ATT” appears when the attenuator is set to ON.
• Noise blanker (p. 50)
➥ Push [NB] to turn the noise blanker ON and OFF.
•“NB” appears when the noise blanker is set to ON.
• Push [NB] for 1 sec. to enter noise blanker set mode.
• Noise reduction (p. 52)
➥ Push [NR] to turn the noise reduction ON and
OFF.
•Rotate [NR] control to adjust the noise reduction level.
•“NR” appears when the noise reduction is set to ON.
• Twin PBT (passband tuning) (p. 51)
➥ Rotate [TWIN PBT] controls (inner/outer).
• Push [PBT C] to clear the settings.
• AGC (auto gain control) (p. 48)
➥ While M1 is selected with [MENU], push
[F1 AGC] several times to select AGC F,
AGC M, AGC S or AGC OFF.
•
1
⁄4 function (p. 21)
➥ While M1 is selected with [MENU], push
[F3 1/4] to turn the
1
⁄4 function ON and OFF.
DD
Convenient functions for transmit
• Transmit quality monitor (p. 56)
➥ Push [MONITOR] to turn the monitor function ON
and OFF.
•“MONI” appears when the monitor function is set to
ON.
IC-7400.qxd 02.4.2 11:35 Page 35
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