1-3
i SQUELCH CONTROL [SQUELCH] (p. 3-8)
Adjusts the squelch threshold level. The squelch
disables output from the speaker (closed condition)
when no signal is received.
• The squelch control is particularly effective for FM or
AM. It is also available for other modes.
•11 to 12 o’clock position is recommended for any set-
ting of the [SQL] control.
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
