Icom IC-7700 Instruction Manual page 21

^5 MANUAL NOTCH FILTER CONTROL [NOTCH]
(outer control; p. 5-18)
Varies the notch frequency of the manual notch filter
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
Lower
frequency
^6 NOTCH SWITCH
NOTCH
➥ Switches the notch function between auto, man-
ual and OFF in SSB and AM modes.
➥ Turns the manual notch function ON and OFF
when pushed in CW, RTTY and PSK31 mode.
➥ Turns the auto notch function ON and OFF when
pushed in FM mode.
• " " appears when manual notch is in use.
MN
• " " appears when auto notch is in use.
AN
➥ Switches the manual notch characteristics from
wide, middle and narrow when pushed and held
for 1 sec.
✔ What is the notch function?
The notch function is a narrow filter that eliminates un-
wanted CW or AM carrier tones while preserving the de-
sired voice signal. The DSP circuit automatically adjusts
the notch frequency to effectively eliminate unwanted
tones.
^7 RIT/∂ ∂ TX CONTROL [RIT/∂ ∂ TX] (pgs. 5-10, 6-4)
Shifts the receive and/or transmit frequency without
changing the transmit and/or receive frequency
shown on the main VFO.
• Rotate the control clockwise to increase the frequency,
or rotate the control counterclockwise to decrease the
frequency. The RIT or ∂TX functions must be ON.
Frequency
decreases
• The shift frequency range is ±9.999 kHz in 1 Hz steps
(or ±9.99 kHz in 10 Hz steps).
Higher
frequency
(p. 5-18)
Frequency
increases
^8 CW PITCH CONTROL [CW PITCH] (p. 4-5)
Shifts the received CW audio pitch and the CW side
tone pitch without changing the operating frequency.
Low
frequency
^9 RIT SWITCH
➥ Turns the RIT function ON and OFF when
pushed.
• Use [RIT/∂TX] control to vary the RIT frequency.
➥ Adds the RIT shift frequency to the operating fre-
quency when pushed and held for 1 sec.
✔ What is the RIT function?
Receiver incremental tuning (RIT) shifts the receive fre-
quency without shifting the transmit frequency.
This is useful for fine tuning stations calling you off-fre-
quency or when you prefer to listen to slightly different-
sounding voice characteristics, etc.
&0 CLEAR SWITCH
Clears the RIT/∂TX shift frequency when pushed
and held for 1 sec. or when pushed momentarily,
depending on the quick RIT/∂TX clear function set-
ting .
(p. 12-15)
&1 ∂ ∂ TX SWITCH
➥ Turns the ∂TX function ON and OFF when
pushed.
• Use [RIT/∂TX] control to vary the ∂TX frequency.
➥ Adds the ∂TX shift frequency to the operating
frequency when pushed and held for 1 sec.
✔ What is the ∂ ∂ TX function?
∂TX shifts the transmit frequency without shifting the re-
ceive frequency. This is useful for simple split frequency
operation in CW, etc.
1-11
PANEL DESCRIPTION
High
frequency
(p. 5-10)
RIT
(pgs. 5-10, 6-4)
CLEAR
(p. 6-4)
∂ ∂ TX
1