Kenwood TS-890S Operation Manual - Page 58

5 COMMUNICATING AIDS Configuring the Band Direct Key during Split Operation Three options are available for selection with regard to the behavior when the band direct key is pressed during split operation. Configure in Menu [3-13] "Band Direct Keys in Split Mode" Setting Value RX Band (default)/ RX Band and Cancel Split Mode/ RX/ TX Band RX Band: Changes the receiving band. RX Band and Cancel Split Mode: Changes the receiving band and cancels the split mode. RX/TX Band: • Changes both the receiving and transmitting bands at the same time. • The transmitting band and receiving band is assigned with the same memory number. • Each band can be adjusted while maintaining the split status. TF-SET (Setting the TX Frequency) TF-SET is a function for temporarily switching the TX frequency and RX frequency. Signals can be received at one's own frequency while the TF-SET switch is pressed and held down, and the TX frequency can also be changed in this state. Doing so allows checking of whether there is interference in the newlyselected TX frequency. • A call is made to the target station when there is no interference and at the right timing to ensure smooth communication with DX stations that are receiving calls from a large number of stations. In other words, the communication status of the DX station in the presence of interfering signals are taken into consideration and transmission is carried out using the TF-SET function at the instant when the DX station is in the receiving state and there is no transmission from other stations. Putting this function to good use enables communication with a larger number of DX stations. 1 Configure the split operation frequency. 2 Press and hold [TF-SET]. The TX frequency and RX frequency are switched. 3 Turn the Tuning control while pressing and holding [TF-SET], or press [UP]/[DWN] on the microphone. Signals are received at the new TX frequency. 4 Release [TF-SET]. Reception starts at the original RX frequency. ● Adjustment of the split frequency using the [RIT/XIT] control is disabled during TF-SET. ● Turning on the frequency lock before using the TF-SET function helps to prevent the transceiver from losing communication with the DX station due to erroneous operation. AGC AGC (Automatic Gain Control) is a function for controlling the IF gain automatically so as to minimize fluctuations in the strength of the signal that is being received. • The AGC time constant is configured to FAST, MID or SLOW according to the receiving status and operation mode (other than FM mode). • The digital AGC circuit of this transceiver divides the time constant into 20 levels from SLOW to FAST, with "1" being the fastest and "20" the slowest. • Generally, the time constant is configured to a fast time constant in the CW and FSK modes where fluctuations in the signal strength are well defined, and a slow time constant is used in the SSB and AM modes where changes are gradual. • However, a fast time constant is also useful in the SSB and AM modes to perform tuning quickly or when receiving weak signals. • AGC can also be turned off. • A different default time constant for AGC is configured for each mode as shown below. Default AGC Time Constant Setting Mode SSB SSB-DATA CW FSK PSK AM AM-DATA Setting SLOW SLOW FAST FAST FAST SLOW SLOW Display AGC-S AGC-F AGC-S 5-2