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
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