Icom IC-7410 Instruction Manual - Page 13

1 PANEL DESCRIPTION ✔ What is the PBT control? The PBT function electronically modifies the IF passband width to reject interference. This transceiver uses the DSP circuit for the PBT function. PBT2 PBT1 $3 CW PITCH CONTROL [CW PITCH] (outer control; p. 37) Rotate to shift the received CW audio pitch and the CW sidetone pitch without changing the operating frequency. • The pitch can be adjusted from 300 to 900 Hz in approximately 5 Hz steps. Higher pitch - + High cut Center Low cut $1 NOTCH SWITCH [NOTCH] (p. 61) (Mode = Auto notch : SSB/AM/FM Manual notch: SSB/CW/RTTY/AM) ➥ In the SSB and AM modes, push to toggle the notch function between auto, manual and OFF. • Either the Auto or Manual Notch function can be turned OFF in the "[NOTCH] SW" item of the Set mode. (p. 88) ➥ In the FM mode, push to turn the Auto Notch function ON or OFF. ➥ In the CW or RTTY mode, push to turn the Manual Notch function ON or OFF. • "MNF" appears when the Manual Notch function is ON. • "ANF" appears when the Auto Notch function is ON. • No icon appears when the Notch function is OFF. ➥ H old down for 1 second to switch the manual filter characteristics from wide, mid and narrow when the Manual Notch function is selected. ✔ What is the notch filter? The notch filter is a narrow filter that eliminates unwanted CW or AM carrier tones, while preserving the desired voice signal. The DSP circuit automatically adjusts the notch frequency to effectively eliminate unwanted tones. $2 MANUAL NOTCH FILTER CONTROL [NOTCH] (inner control; p. 61) Rotate to adjust the notch frequency to reject an inter- fering signal when the Manual Notch function is ON. • Notch filter center frequency: SSB/RTTY : -1040 Hz to +4040 Hz CW : C W pitch freq. -2540 Hz to CW pitch freq. +2540 Hz AM : -5060 Hz to +5100 Hz Higher frequency Lower frequency Lower pitch $4 ∂TX SWITCH [∂TX] (p. 65) ➥ P ush to turn the ∂TX function ON or OFF. • Use the [RIT/∂TX] control to vary the ∂TX frequency. ➥ H old down for 1 second to shift the transmit frequency up or down by the ∂TX frequency shift. ✔ 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. $5 CLEAR SWITCH [CLEAR] (pp. 53, 65) Hold down for 1 second* to clear the RIT/∂TX fre- quency shift. * When the "Quick RIT Clear" item in the Set mode is set to "ON," push momentarily to reset the frequency shift. (p. 88) $6 RIT SWITCH [RIT] (p. 53) ➥ P ush to turn the RIT function ON or OFF. • Use [RIT/∂TX] control to vary the RIT frequency. ➥ H old down for 1 second to shift the receive frequency up or down by the RIT frequency shift. ✔ What is the RIT function? The RIT (Receiver Incremental Tuning) 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 differentsounding voice characteristics, etc. $7 RIT/∂TX CONTROL [RIT/∂TX] (pp. 53, 65) When either or both the RIT/∂TX functions are ON, rotate to adjust the RIT/∂TX frequency shift. • Rotate the control clockwise to increase the frequency, or counterclockwise to decrease the frequency. • The frequency shift range is ±9.999 kHz in 10 Hz steps. The control tunes in 1 Hz steps when the operating frequency readout is set to the 1 Hz step readout. Shift high Shift low 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 6