Kenwood TS-870S User Manual - Page 50

OPERATING AIDS RECEIVING RIT (RECEIVE INCREMENTAL TUNING) RIT provides the ability to change your receive frequency by ±9.99 kHz in steps of 10 Hz without changing your transmit frequency. If the Fine Tuning ([FINE]) function is ON, the step size is 1 Hz. RIT works equally well with all modulation modes and while using VFO mode or Memory Recall mode. It's a good habit to switch OFF the RIT function after a contact is finished. This returns the receive frequency to the transmit frequency. It ensures that you don't listen by mistake on a different frequency from your transmit frequency on the next contact. When using Memory Recall mode, RIT only functions with a memory channel containing stored data. Since an empty channel contains no receive frequency, RIT cannot function. 1 Press [RIT]. • "RIT" and the RIT frequency display appear. AGC AUTO USB SPLIT RIT 2 Press [CLEAR] to reset, if required, the RIT offset to 0. 3 Turn the RIT/XIT control to change your receive frequency. AGC AUTO USB SPLIT RIT 4 To cancel the RIT function, press [RIT]. Note: The frequency shift set by the RIT/XIT control is also used by the XIT function. AGC (AUTOMATIC GAIN CONTROL) The AGC function selects the time constant for the automatic gain control circuit. Selecting a slow time constant will cause the receiver gain and S-meter readings to react slowly to large input changes. A fast time constant causes the receiver gain and the S-meter to react quickly to changes in the input signal. A fast AGC setting is particularly useful in the following situations: • Tuning rapidly • Receiving weak signals • Receiving high-speed CW The TS-870S will take charge of setting the AGC, using independent release times that you specify for each mode. Or, you can have total control by manually adjusting the AGC yourself from the Front Panel. When receiving strong signals in AM mode with the AGC OFF, the clipping action will make reception difficult or impossible. To select whether you want Automatic or Manual control, use Menu No. 01 (AUT/MAN). Select OFF for Manual control and ON for Automatic control. The default is Manual (OFF). ■ Changing AGC Automatic (Menu No. 01 (AUT/MAN) is ON): The following Menu items are available to change the AGC release time in Automatic mode: Mode SSB CW FSK AM Menu No. Selections 02 OFF, 1 ~ 20 03 OFF, 1 ~ 20 04 OFF, 1 ~ 20 05 OFF, 1 ~ 20 Default 7 12 14 5 Manual (Menu No. 01 (AUT/MAN) is OFF): With Menu No. 01 (AUT/MAN) set to OFF, adjust the AGC control to set the AGC release time as you prefer. • Turning the control clockwise selects a faster release time and counterclockwise selects a slower release time. • To switch OFF the AGC completely, turn the AGC control fully counterclockwise. ■ Changing AF AGC The TS-870S offers further control of your receiver AGC for the FM and AM modes. For these two modes, you may adjust the AGC release time and level in the AF stage. Function Menu No. Selections AF AGC 06 0: Slow Release 1: Med Time 2: Fast AF AGC 07 0: OFF Level 1: Min 2: Med 3: High 4: Max Default 1: Med 1: Min 44