Kenwood TS-890S Operation Manual - Page 74

5 COMMUNICATING AIDS FFT Scope The audio FFT scope is used for viewing the tuning status. The two vertical lines on the left and right represent the mark and space frequencies respectively. Adjust the tuning frequency while receiving a signal such that the two peaks overlap evenly with the two lines. Waterfall The waterfall is a time-series display of the RX signal spectrum which functions in tandem with the FFT scope. The entire waterfall display can also be shifted in tandem with changes in the RX frequency. X-Y Scope The X-Y scope displays the tuning status in the RTTY (FSK) mode as a cross pattern. The cross patterns bisect at right angles (90 degrees) when this transceiver is correctly tuned to the signal. Threshold Level Displays the threshold value of the RX signal level for decoding. Saving RTTY Communication Logs The CW, RTTY and PSK communication screens can be saved using the communication log function. Please refer to "Communication Log" on page 5-27. Adjusting the RTTY Decode Threshold Level Noise that occurs when there is no signal may sometimes be erroneously detected as text, which results in the display of unwanted text. To reduce the occurrence of such issues, adjust the threshold level. • Raise the threshold level when there is frequent erroneous detection due to noise. 1 Press F5 [THLD]. The threshold level setting can now be adjusted. . .. ... ... Operating the RTTY Encode/Decode Screen The following operations are enabled when the RTTY communication screen opens. • Pressing the [Page Up] or [Page Down] key scrolls the display of the TX or RX details. Key F1 [MORE] F3 [PAUSE] F4 [LOG] F4 [(CLEAR)] F5 [THLD] F5 [MEMORY] F6 [X-Y LEV] F7 [EXTEND] Behavior Switches the key guide. Pauses update (drawing) of the TX/RX details display area. Pressing the key again resumes the update (drawing). Turns ON/OFF the communication log function. Pressing and holding this key displays the screen for selecting a log file that is saved. Pressing and holding the key clears the text displayed on the TX/RX details screen. Switches to the threshold level configuration mode. Switches to the RTTY Message screen. Switches between the speed and density of the XY scope. Enlarges the size of the RTTY communication screen. Pressing it again restores the screen to the standard size. Indicator Displays Display Behavior Appears when the communication log function is ON. Appears when the communication log function is ON and in the standby mode. Appears when signal decoding is in progress. Appears when encoding the characters in the TX buffer. Appears when the decode function is stopped or disabled. Appears when transmitting the message memory. Appears when in the insert mode. Appears when in the overwrite mode. 2 Press F4 [-]/ F5 [+] or turn the [MULTI/CH] control to adjust the level. Setting Value 1 to 10 (default) to 30 (1 step) • Adjust the threshold value in the ascending order according to the receiving status of noise, for example. Start from a small value between the range of 1 to 30 and configure the threshold value to a point where reception is good. • To restore the default setting, press and hold F2 [(RESET)]. 3 Press F1 [ ] to end the process. FFT Scope/X-Y Scope Display Setting The tuning scope displayed on the RTTY communication screen can be switched to an "FFT scope" or "X-Y scope" display. Configure in Menu [2-09] "RTTY Tuning Scope" Setting Value FFT Scope (default)/ X-Y Scope • The display toggles between the "FFT Scope" and "X-Y Scope" each time the scope display on the screen is touched. FFT Scope Waveform Averaging The waveform displayed on the FFT scope can be averaged. Averaging of the waveform reduces random noise and makes observation of the target signal easier. Configure in Menu [2-00] "FFT Scope Averaging (RTTY Decode)" Setting Value 0 (default) to 9 (1 step) (minimum to maximum averaging) 5-18