Communicating Aids, AGC Automatic Gain Control

8 COMMUNICATING AIDS

■Fine Tuning

The default frequency step size when turning the Tuning control to change the frequency is 10 Hz for SSB, CW, and FSK modes, and 100 Hz for FM and AM modes. However, you can change the frequency step size to 1 Hz for SSB, CW, and FSK modes, and 10 Hz for FM and AM modes.

1Press [FINE/ STEP].

¥ÒFINEÓ appears.

2Turn the Tuning control to select the exact frequency.

3To quit the function, press [FINE/ STEP] again.

¥ÒFINEÓ disappears.

■Tuning control adjustment rate

The default Tuning control adjustment rate is 500. This represents the number of pulses the Tuning control generates in a complete revolution. Each pulse changes the tuning frequency based on the current frequency step size (the frequency step size for the Tuning control is 10 Hz for SSB/ CW/ FSK mode and 100 Hz for AM/ FM mode). For example, in SSB mode the frequency step size is

10Hz, so the frequency would change by

5,000 Hz in a complete revolution of the Tuning control. The adjustment rate of the Tuning control can be lowered to 250 pulses per revolution or increased to 1000 pulses per revolution.

1Press [MENU/ F.LOCK].

2Turn the MULTI control to select Menu No. 03.

3Press []/ [] to select Ò250Ó, Ò500Ó (default), or Ò1000Ó.

4Press [MENU/ F.LOCK] to store the setting and exit Menu mode.

■Equalizing VFO Frequencies (A=B)

This function allows you to copy the frequency and modulation mode of the active VFO to the inactive VFO.

1Select the frequency and mode on VFO A or VFO B.

2Press [A=B/ SPLIT].

¥The frequency and mode selected in step 1 are duplicated to the inactive VFO.

3Press [A/B / M/V] to confirm that the frequency was copied to other VFO.

step size becomes 1 Hz. RIT works equally well with all modulation modes and while using VFO or Memory Recall mode.

1Press [RIT].

• ÒRITÓ and the RIT offset appear.

2If required, press [CL] to reset the RIT offset to 0.

3Turn the RIT/ XIT control to change your reception frequency.

4To turn RIT OFF, press [RIT].

¥ The reception frequency is returned to the frequency that was selected prior to step 1.

Note: When storing the frequency in a Memory channel with the RIT function ON, the RIT offset frequency is added or subtracted to/ from the VFO frequency. The calculated data is then stored in the Memory channel.

AGC (AUTOMATIC GAIN CONTROL)

When using a mode other than FM, AGC 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

For your convenience, the following default AGC time constant has already been programmed.

SSB: Slow (ÒAGCÓ)	CW: Fast (ÒAGC - FÓ)
FSK: Fast (ÒAGC - FÓ)	AM: Slow (ÒAGCÓ)

To change the default time constant:

1Press [AGC/ 0/ OFF].

¥The AGC time constant icon appears on the display (ÒAGCÓ: Slow, ÒAGC - FÓ: Fast).

¥Each time you press [AGC/ 0/ OFF], the AGC time constant alternates fast and slow.

RIT (RECEIVE INCREMENTAL TUNING)

RIT provides the ability to change your reception frequency by ±9.99 kHz in steps of 10 Hz without changing your transmission frequency. If the Fine Tuning ([FINE/ STEP]) function is ON, the frequency

2If you want to turn the AGC OFF, press [AGC/ 0/ OFF] (1 s).

¥ ÒAGC OFFÓ appears on the display.

Note: You cannot adjust the AGC time constant in FM mode.