Icom IC-7700 Stereo Amplifier User Manual


 
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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