Kenwood TS-990S Operation Manual - Page 121

Adjusting The Rtty Threshold Level Of Rtty Decoding, Displaying The Scope To Check Rtty Tuning

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ADJUSTING THE RTTY THRESHOLD LEVEL OF RTTY DECODING The received noise while no signal is present may occasionally be erroneously recognized as a valid character, decoded and displayed. The threshold level should be adjusted to reduce or eliminate this symptom. If there are many erroneous detections due to noise, increment the threshold level. d 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. If [THLD] (F5) is unavailable in the function key guide, press [MORE] (F1). An alternate key guide will appear. 4 Press [-] (F4) or [+] (F5), or rotate the MULTI/CH control to adjust the level. Pressing and holding [(RESET)] (F1) resets the configured parameter to the default. The default is "10". 5 Press [ ] (F1) to exit. 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} Contents Index 5-41

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5-41
ASSISTING YOUR SMOOTH QSO 5
Index
Contents
ADJUSTING THE RTTY THRESHOLD LEVEL OF
RTTY DECODING
The received noise while no signal is present may
occasionally be erroneously recognized as a valid
character, decoded and displayed. The threshold level
should be adjusted to reduce or eliminate this symptom.
If there are many erroneous detections due to noise,
increment the threshold level.
[F1]~[F7]
[FSK/PSK/REV]
[MULTI/CH]
1
Press
[FSK/ PSK/ REV]
to enter RTTY (FSK) mode.
2
Press
[DECODE]
(F3) to select either main band or
sub band.
3
Press
[THLD]
(F5) to allow editing of the threshold
level.
The threshold level configuration below the Waterfall display
can be changed.
If
[THLD]
(F5) is unavailable in the function key guide, press
[MORE]
(F1). An alternate key guide will appear.
4
Press
[-]
(F4) or
[+]
(F5), or rotate the
MULTI/CH
control to adjust the level.
Pressing and holding
[(RESET)]
(F1) resets the configured
parameter to the default. The default is "10".
5
Press
[
]
(F1) to exit.
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}