Icom IC-7700 User Manual
Page 21
1-11
^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