Kenwood TS-890S Operation Manual - Page 79

Adjusting the PSK Decode Threshold Level

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COMMUNICATING AIDS 5 The layout of the PSK communication screen is as follows. Indicator TX/RX Details FFT Scope Character String Buffer Waterfall Threshold Level Indicator Indicates the status of the function. TX/RX Details Displays the character strings that are transmitted or received. Character String Buffer Character strings to be transmitted. FFT Scope The audio FFT scope is used for viewing the tuning status. If there are multiple signals in the band, the target signal is tuned such that it becomes a 1500 Hz tone. Zero-in needs to be performed accurately in the PSK mode. Zeroin the target signal while monitoring the FFT scope and vectorscope. Waterfall Displays the transition in the spectrum of the TX audio signal in tandem with the FFT scope. Vectorscope The vectorscope indicates the way in which the PSK signals received are tuned. It comes in handy when tuning to the signal of the target station while monitoring the waveform on the vectorscope. Threshold Level Displays the threshold value of the RX signal input level for decoding. 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 character strings in the TX character string buffer. Appears when the decode function is stopped or disabled. Appears when transmitting the auto standby channel during transmission of the message memory. Displays the baud rate. Displays the communication mode. Appears when in the insert mode. Appears when in the overwrite mode. Appears when AFC is ON. Displays the difference in frequency at the bottom. Appears when NET is ON. Saving PSK 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 PSK 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 PSK Communication Screen The following operations are enabled when the PSK communication screen opens. • Pressing the [Page Up] or [Page Down] key scrolls the display of the TX or RX details. Key F1 [MORE] F2 [B/QPSK] F3 [31/63] F3 [PAUSE] F4 [LOG] F4 [(CLEAR)] F5 [THLD] F5 [MEMORY] F6 [AFC] F7 [EXTEND] Behavior Switches the key guide. Switches between the BPSK and QPSK modes. Switches between the PSK31 and PSK63 modes. 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 PSK Message screen. Switches the AFC function. Enlarges the size of the PSK communication screen. Pressing it again restores the screen to the standard size. 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. 3 Press F1 [ ] to end the process. 5-23

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The layout of the PSK communication screen is as follows.
Character String Buffer
Waterfall
Threshold Level
FFT Scope
Indicator
TX/RX Details
Indicator
Indicates the status of the function.
TX/RX Details
Displays the character strings that are transmitted or received.
Character String Buffer
Character strings to be transmitted.
FFT Scope
The audio FFT scope is used for viewing the tuning status.
If there are multiple signals in the band, the target signal is tuned
such that it becomes a 1500 Hz tone.
Zero-in needs to be performed accurately in the PSK mode. Zero-
in the target signal while monitoring the FFT scope and
vectorscope.
Waterfall
Displays the transition in the spectrum of the TX audio signal in
tandem with the FFT scope.
Vectorscope
The vectorscope indicates the way in which the PSK signals
received are tuned. It comes in handy when tuning to the signal of
the target station while monitoring the waveform on the
vectorscope.
Threshold Level
Displays the threshold value of the RX signal input level for
decoding.
Operating the PSK Communication Screen
The following operations are enabled when the PSK
communication screen opens.
•
Pressing the
[Page Up]
or
[Page Down]
key scrolls the display
of the TX or RX details.
Key
Behavior
F1 [MORE]
Switches the key guide.
F2 [B/QPSK]
Switches between the BPSK and QPSK modes.
F3 [31/63]
Switches between the PSK31 and PSK63 modes.
F3 [PAUSE]
Pauses update (drawing) of the TX/RX details display
area. Pressing the key again resumes the update
(drawing).
F4 [LOG]
Turns ON/OFF the communication log function.
Pressing and holding this key displays the screen for
selecting a log file that is saved.
F4 [(CLEAR)]
Pressing and holding the key clears the text displayed
on the TX/RX details screen.
F5 [THLD]
Switches to the threshold level configuration mode.
F5 [MEMORY]
Switches to the PSK Message screen.
F6 [AFC]
Switches the AFC function.
F7 [EXTEND]
Enlarges the size of the PSK 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 character strings in the
TX character string buffer.
Appears when the decode function is stopped or
disabled.
Appears when transmitting the auto standby channel
during transmission of the message memory.
Displays the baud rate.
Displays the communication mode.
Appears when in the insert mode.
Appears when in the overwrite mode.
Appears when AFC is ON.
Displays the difference in frequency at the bottom.
Appears when NET is ON.
Saving PSK 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 PSK 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.
3
Press F1 [
] to end the process.
COMMUNICATING AIDS
5
5-23