4-14
D About RTTY reverse mode
Received characters are occasionally garbled when
the received signal has Mark and Space tones re-
versed. This reversal can be caused by incorrect TNC
connections, setting, commands, etc. To receive re-
versed RTTY signals correctly, select RTTY-R mode.
➥ During RTTY mode, hold down
RTTY/PSK
for
1 second to select RTTY and RTTY-R mode.
D Twin peak filter
The twin peak filter changes audio frequency response
by boosting the mark and space frequencies (2125
and 2295 Hz) for better reception of RTTY signals.
➥ During RTTY mode, push
APF/TPF
to turn the
twin peak filter ON or OFF.
•
“
” appears in the LCD and the [APF/TPF] indicator
above this switch lights green while the filter is in use.
NOTE: When the twin peak filter is in use, the
received audio output may increase. This is a nor-
mal, not a malfunction.
Normal Reverse
Space
Mark
BFO
Space
Mark
BFO
170 Hz 2125 Hz 170 Hz2125 Hz
4
RECEIVE AND TRANSMIT
• Preamp (p. 5-10)
➥ Push [P.AMP]
(MF3) several times to set the
preamp OFF, preamp 1 ON or preamp 2 ON.
•Hold down [P.AMP] (MF3) for 1 second to turn the
preamp function OFF.
•“P.AMP1” or“P.AMP2” appears when the preamp 1
or preamp 2 is ON.
• Attenuator (p. 5-10)
➥ Push [ATT] (MF4) several times to set the attenu-
ator in 6 dB steps.
•Hold down [ATT] (MF4) for 1 second to turn the
attenuator function OFF.
•“ATT”andattenuationlevelappearwhentheattenu-
ator is ON.
• Noise blanker (p. 5-17)
➥ Push
NB
to turn the noise blanker ON or
OFF, and then rotate [NB] control to adjust the
threshold level.
•Noise blanker indicator (above
NB
switch) lights
when the noise blanker is ON.
•Holddown
NB
for 1 second to enter noise blank-
er set mode.
• Twin PBT (passband tuning) (p. 5-13)
➥ Rotate [TWIN PBT] controls (inner/outer).
•PBTindicator(above
PBT-CLR
switch) lights when
PBT is in use.
•Hold down
PBT-CLR
for 1 second to clear the set-
tings.
• Noise reduction (p. 5-18)
➥ Push
NR
to turn the noise reduction ON or
OFF.
•Rotate [NR] control to adjust the noise reduction
level.
•Noisereductionindicator(above
NR
switch) lights
when the noise reduction is ON.
• Manual notch filter (p. 5-19)
➥ Push
NOTCH
to turn the manual notch func-
tion ON or OFF.
•Rotate [NOTCH] control to set the attenuating fre-
quency.
•Notchindicator(above
NOTCH
switch) lights when
the manual notch is ON.
• AGC (auto gain control) (p. 5-12)
➥ Push [AGC] switch several times to select
AGC FAST, AGC MID or AGC SLOW.
➥ Push
AGCVR
to turn the AGC time constant
manual setting ON or OFF.
•Rotate[AGC]controltoadjustthetimeconstant.
•
1
⁄4 function (p. 3-6)
➥ Push [1/4] to turn the
1
⁄4 function ON or OFF.
D Convenient functions for receive
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