Icom IC-7700 - Manual (Page 21)

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^5 MANUAL NOTCH FILTER CONTROL [NOTCH]
(outer control; p. 5-18)
Varies the “valley” 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 NOTCH SWITCH (p. 5-18)
➥
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.
• “ ” appears when auto notch is in use.
➥ 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 filtering 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.
• The shift frequency range is ±9.999 kHz in 1 Hz steps
(or ±9.99 kHz in 10 Hz steps).
^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.
^9
RIT SWITCH (p. 5-10)
➥ 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 (pgs. 5-10, 6-4)
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 (p. 6-4)
➥ 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.
∂ ∂ TX
CLEAR
RIT
AN
MN
NOTCH
High
frequency
Low
frequency
Frequency
increases
Frequency
decreases
Higher
frequency
Lower
frequency
1
PANEL DESCRIPTION