Icom IC-R9500 Instruction Manual page 13

o PASSBAND TUNING CONTROLS [TWIN PBT]
(p. 5-11)
Adjusts the IF filter "passband width" via the DSP.
• Passband width and shift frequency are shown on the
multifunction display.
• Push and hold [PBT CLEAR] for 1 sec. to clear the PBT
settings.
• Variable range is set to half of the IF filter passband
width. 25 Hz steps and 50 Hz steps are available in
SSB, CW and FSK modes.
✔ What is the PBT control?
The PBT function electronically modifies the IF passband
width to reject interference. This receiver uses the DSP cir-
cuit for the PBT function.
(PBT1)
–
High cut
!0 PBT CLEAR SWITCH [PBT CLEAR] (p. 5-11)
Push and hold for 1 sec. to clear the PBT settings.
• The [PBT CLEAR] indicator above this switch lights
when PBT is in use.
!1 AGC CONTROL [AGC] (p. 5-10)
Adjusts the continuously-variable AGC circuit time
constant.
• To use [AGC] control, push the appropriate band's
[AGC VR/OFF] ([AGC VR] indicator lights green).
Fast
!2 AGC SWITCH [AGC VR/OFF] (p. 5-10)
➥ Push to toggle [AGC] control usage ON or OFF.
• Use [AGC] control to set the AGC time constant when
switched ON.
• The [AGC VR] indicator above this switch lights
green when the control is ON.
➥ Turns the AGC function OFF when pushed and
held for 1 sec.
!3 AUTO NOTCH SWITCH [ANF] (p. 5-16)
➥ Turns the auto notch function ON or OFF when
pushed in SSB, AM, FM and WFM mode.
• " " appears when auto notch is in use.
AN
(PBT2)
Center Low cut
Slow
!4 MANUAL NOTCH SWITCHES
[NOTCH1]/[NOTCH2] (p. 5-16)
➥ Turns the manual notch function ON or OFF
when pushed in SSB, CW, AM and FSK mode.
• " " or "
MN1
➥ Switches the manual notch characteristics be-
tween wide, middle and narrow when pushed
and held for 1 sec.
✔ What is the notch function?
The notch function eliminates unwanted CW or AM carrier
tones while preserving the desired voice signal. The DSP cir-
cuit automatically adjusts the notch frequency to effectively
eliminate unwanted tones.
!5 MANUAL NOTCH FILTER CONTROLS
[NOTCH1]/[NOTCH2] (p. 5-16)
Varies the "notch" frequency of the manual notch fil-
ter to reject an interfering signal while the manual
notch function is ON.
• Notch filter center frequency:
SSB : –1060 Hz to 4040 Hz
+
CW : CW pitch freq. + 2540 Hz to CW pitch freq.
–2540 Hz
AM : –5100 Hz to 5100 Hz
frequency
!6 AUDIO PEAK FILTER/TWIN PEAK FILTER
SWITCH [APF/TPF]
➥ Push to turn the audio peak filter ON or OFF dur-
ing CW mode operation. (p. 4-10)
➥ Push to turn the twin peak filter ON or OFF dur-
ing FSK mode operation. (p. 4-12)
• " " appears when audio peak filter is in use.
APF
• " " appears when twin peak filter is in use.
TPF
➥ During CW mode operation, push and hold for
1 sec. to select the APF passband width from 80,
160 and 320 Hz. (p. 4-10)
!7 NOISE BLANKER SWITCH [NB] (p. 5-15)
➥ Selects from noise blanker 1, 2, or OFF when
pushed. The noise blanker reduces pulse-type
noise such as that generated by automobile igni-
tion systems. This function cannot be used for
FM/WFM, P25 modes or non-pulse-type noise.
• The [NB] indicator above this switch lights green and
"NB1" or "NB2" appears on the display when the
function is activated.
➥ Enters blank-width set mode when pushed and
held for 1 sec.
!8 NOISE REDUCTION SWITCH [NR] (p. 5-16)
Push to switch the DSP noise reduction ON or OFF.
• The [NR] indicator above this switch lights green when
the function is activated.
1-3
PANEL DESCRIPTION
" appear when manual notch is in use.
MN2
NOTCH1
NOTCH2
Higher
Lower
frequency
1