1-3
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.
!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).
!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.
!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 “
” appear when manual notch is in use.
➥
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
!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.
• “
” appears when twin peak filter is in use.
➥
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.
TPF
APF
Higher
frequency
NOTCH1
NOTCH2
Lower
frequency
MN2
MN1
AN
Slow
Fast
Low cut
High cut
Center
–
+
(PBT1)
(PBT2)
1
PANEL DESCRIPTION
