Kenwood TS-990S - Manual (Page 116)

5-38
5 ASSISTING YOUR SMOOTH QSO
Index Contents
DISPLAYING THE SCOPE TO CHECK RTTY
TUNING
FFT SCOPE
The transceiver is provided with an audio FET scope to
observe the tuning condition of the transceiver in RTTY
(FSK) mode. The audio FET scope appears in the RTTY
Encode/Decode screen.
The two vertical lines on the left and right indicate mark
and space frequencies. While receiving the signal, adjust
the tuning frequency so that the two peaks overlaps the
two lines equally.
AVERAGING THE WAVEFORM IN THE FFT SCOPE
The waveform to be displayed on an FFT scope can be
averaged. Waveform averaging will reduce the random
noise, allowing you to observe the target signal.
[F1] [F7]
[FSK/PSK/REV]
[S.DISP]
[ESC]
1 Select Group No. 2, "Decoding & Encoding", from the
Menu screen.
2 Access Menu 00, "FFT Scope Averaging (RTTY
Decode)".
3 Press [SELECT] (F4) to allow editing of the parameter
box.
4 Press [-] (F4) or [+] (F5) to select the desired value
from "0" to "9" in the parameter box.
Selecting the larger parameter will display the spectra with
the noise component reduced. The default is "0".
5 Press [ ] (F1).
6 Press [ESC] to exit.
Note:
◆ Use Fine Tuning if it is not easy to tune. {page 4-14}
WATERFALL
In linking with the audio FFT scope, transition of the
frequency components contained in the received audio
signal can be displayed.
X-Y SCOPE (SUB-SCREEN)
The tuned status of the signal in RTTY (FSK) mode is
displayed as a cross pattern (90 degrees) on the X-Y
scope. The cross patterns bisect at right angles when the
transceiver is correctly tuned into the signal.
1 Press [FSK/ PSK/ REV] to enter RTTY (FSK) mode.
2 Press [DECODER] (F3) to open the RTTY Encode/
Decode screen.
3 Press [S.DISP/ SEL] to display the X-Y Scope.
Note:
◆ The X-Y scope appears only if the RTTY Encode/Decode screen
appears on the main screen.