Icom IC-7700 CLEAR SWITCH, ✔What is the RIT function, &1∂TX SWITCH ∂TX (p. 6-4), ✔What is the ∂TX function, ^9RIT SWITCH RIT (p. 5-10), ✔What is the notch function

^5MANUAL NOTCH FILTER CONTROL [NOTCH] (outer control; p. 5-18)

Varies the “valley” 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
	Higher
	frequency
	Lower
	frequency

^6NOTCH SWITCH NOTCH (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.

•“ MN ” appears when manual notch is in use.

•“ AN ” 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 unwanted CW or AM carrier tones while preserving the desired voice signal. The DSP circuit automatically adjusts the filtering frequency to effectively eliminate unwanted tones.

^7RIT/∂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 increases

Frequency decreases

•The shift frequency range is ±9.999 kHz in 1 Hz steps (or ±9.99 kHz in 10 Hz steps).

PANEL DESCRIPTION 1

^8CW PITCH CONTROL [CW PITCH] (p. 4-5) Shifts the received CW audio pitch and the CW side tone pitch without changing the operating frequency.

High frequency

Low frequency

^9RIT SWITCH RIT (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 frequency without shifting the transmit frequency.

This is useful for fine tuning stations calling you off-frequency or when you prefer to listen to slightly different- sounding voice characteristics, etc.

&0CLEAR SWITCH CLEAR (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 setting (p. 12-15).

&1∂TX SWITCH ∂TX (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 receive frequency. This is useful for simple split frequency operation in CW, etc.

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