Kenwood TS-990S, Инструкция по эксплуатации

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5-52
5 ASSISTING YOUR SMOOTH QSO
Index Contents
DISPLAYING THE SCOPE TO CHECK PSK
TUNING
FFT SCOPE
The transceiver is equipped with an audio FET scope
allowing you to observe the tuned status of the transceiver
in PSK (FSK) mode. The audio FET scope appears in the
PSK Encode/Decode screen.
If there are multiple signals present in the band, you can
tune the target signal to be a 1500 Hz tone.
In PSK mode, you need to make an accurate zero-in. The
vector scope appears on the sub screen. By observing the
FFT scope and vector scope, you can zero-in on the target
signal.
AVERAGING THE WAVEFORM IN THE FFT SCOPE
The waveform to be displayed on an FFT scope can be
averaged. Waveform averaging reduces the effects of
random noise, allowing you to observe the target signal.
[F1]~[F7]
[FSK/PSK/REV] [ESC]
[S.DISP]
1 Select Group No. 2, "Decoding & Encoding", from the
Menu screen.
2 Access Menu 09, "FFT Scope Averaging (PSK
Decode)".
3 Press [SELECT] (F4) to allow editing of the parameter
box.
4 Press [-] (F4) or [+] (F5) to select one from "0" to "9".
Increasing the parameter maximizes the noise component.
The default is "0".
5 Press [ ] (F1).
6 Press [ESC] to exit.
WATERFALL
The Waterfall screen uses spectrum linking with the
audio FFT scope and displays the transition of frequency
components contained in the received audio signal.
VECTOR SCOPE (SUB-SCREEN)
The vector scope displays how the received PSK signal is
tuned. This allows you to tune the signal from the station
you are in QSO with by observing their waveform on the
vector scope.
Follow the procedure below to open the vector scope.
1 Press [FSK/ PSK/ REV] to enter PSK mode.
2 Press [DECODER] (F3) to open the PSK Encode/
Decode screen.
3 Press [S.DISP/ SEL] to display the vector scope.
The sub-screen cycles as follows: Vector scope -> Main band
frequency and dial -> Main band frequency and sub band
frequency -> Vector scope
4 Rotate the Tuning control to tune the signal until the
traces displayed on the vector scope will be radiate in
the correct directions from the center.