Fft Scope/Vectorscope Display Setting; Fft Scope Waveform Averaging; Selecting A Waterfall Display Type; Vectorscope - Kenwood TS-890S Instruction Manual

5 COMMUNICATING AIDS

FFT Scope/Vectorscope Display Setting

The tuning scope displayed on the PSK communication screen
can be switched to an "FFT scope" or "vectorscope" display.
Configure in Menu [2-13] "PSK Tuning Scope"
Setting Value FFT Scope (default)/ Vector Scope
• The display toggles between the "FFT scope" and "Vector
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 [2-10] "FFT Scope Averaging
(PSK Decode)"
0 (default) to 9 (1 step) (minimum to maximum
Setting Value
averaging)

Selecting a Waterfall Display Type

Configure in Menu [2-17] "Waterfall when Tuning
(RTTY/PSK Audio Scope)"
Setting Value Straight (default)/ Follow
Straight: Uses a straight line to show transition in the level of
the target signal displayed on the waterfall when the RX
frequency is altered.
Follow: Tracks and displays the latest FFT scope level at the
portion where the waterfall starts flowing when the RX
frequency is altered.

Vectorscope

Turn the Tuning control to perform tuning such that the emission
lines displayed on the vectorscope radiate from the center into the
same direction.
In Tune (BPSK)
Idle Signal of BPSK or QPSK
.
Make use of the fine-tuning function if there is difficulty
●
in performing tuning.
While transmission is in progress, the vectorscope does
●
not function and points to the 12 o'clock direction.
5-24
In Tune (QPSK)
Unmodulated Carrier Signal

AFC (Automatic Frequency Control)

The AFC (Automatic Frequency Control) function can be used to
tune the PSK signal that is being received.
Press F6 [AFC] to set the AFC function to "On".
• Pressing F6 [AFC] each time toggles the option in the
following sequence: "OFF" → "AFC ON" →" AFC&NET ON"
→ "OFF".
• When the AFC function is ON, the <<
up. The amount of frequency correction made by the AFC
function is displayed below "AFC".
• Pressing and holding F6[AFC] while the AFC function is ON
increases or decreases the displayed frequency which
indicates the amount of correction made by the AFC
function.
.

Configuring the AFC Tuning Range

Configure the frequency range for tuning the PSK signals that are
received using the AFC function.
Configure in Menu [2-11] "PSK AFC Tuning Range"
Setting Value ±8/ ±15 (default) [Hz]

NET

The NET function transmits signals by applying the frequency that
is automatically tuned by AFC.
Press F6 [AFC] to select "AFC & NET".
• Pressing F6 [AFC] each time toggles the option in the
following sequence: "OFF" → "AFC function ON" →" AFC
function & NET function ON" → "OFF".
• << >> and <<
.

Switching between BPSK and QPSK

The PSK mode is further divided into 2 sub-modes, namely BPSK
and QPSK. BPSK is the more commonly used mode. QPSK excels
at correcting errors and boasts a higher decoding rate than BPSK.
Press F2 [B/QPSK].
Pressing the key each time toggles the mode between BPSK
and QPSK. The display to the right of the status bar toggles
between << >> and <<
switched.
This is fixed at BPSK when the PSK63 mode is selected.
●
>> display lights
>> light up.
>> when the mode is