Operating The Rtty Encode/Decode Screen; Indicator Displays; Saving Rtty Communication Logs; Adjusting The Rtty Decode Threshold Level - Kenwood TS-890S Instruction Manual

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.

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] Switches the key guide.
Pauses update (drawing) of the TX/RX details
F3 [PAUSE] display area. Pressing the key again resumes the
update (drawing).
Turns ON/OFF the communication log function.
F4 [LOG] Pressing and holding this key displays the screen
for selecting a log file that is saved.
Pressing and holding the key clears the text
F4 [(CLEAR)]
displayed on the TX/RX details screen.
Switches to the threshold level configuration
F5 [THLD]
mode.
F5 [MEMORY] Switches to the RTTY Message screen.
Switches between the speed and density of the X-
F6 [X-Y LEV]
Y scope.
Enlarges the size of the RTTY communication
screen.
F7 [EXTEND]
Pressing it again restores the screen to the
standard size.

Indicator Displays

Display
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.
.
5-18
Behavior
Behavior

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.
.
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)"
0 (default) to 9 (1 step) (minimum to maximum
Setting Value
averaging)