Rtty ( Radio Teletype ) Operation; Rtty Decode ( With Optional Fft Unit ) - Yaesu FT dx 1200 Operating Manual

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The FT 1200 has the capability of a RTTY decode function when the optional FFT unit is installed. You can easily
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synchronize by aligning the marker displayed on the AF-FFT screen, together with the decode screen while receiving a
signal. Mark frequency (2125 Hz), SHIFT width (170 Hz), and baudot code (US) can be changed in Menu Mode.
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1. Before operating, set the Menu items in the chart to
the right.
2. Press the [ MODE ] switch, set the operating mode to
"RTTY LSB".
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 Press and hold the [ MODE ] switch for approxi-
mately one second to switch back and forth between
"RTTY USB" and "RTTY LSB".
 Generally, amateur band stations operate RTTY in
LSB.
3. Tune to a RTTY signal, press and hold the [ SCOPE ]
switch for one second or longer.
The RTTY DECODE screen displays, and the de-
coded text is displayed on the screen.
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 Align the peak of the received signal with the mark
frequency and shift frequency marker of the AF-FFT
screen.
 If text is displayed due to noise and band clutter,
when a RTTY signal is not being received, turn the
[ ] knob to adjust and threshold level.
VFO-B/CLAR
Displays the decoded RTTY
signal.
Displays content written to
the RTTY text memory
※ If you transmit content written to the RTTY text memory
(page 104), the transmitted RTTY signal is displayed as
text.
Note that transmitted text is displayed in white.
Scrambled text may be displayed due to noise and band clutter, when a signal is not being received. You can ad-
just the threshold level so the scrambled text is not displayed.
Turn the [
VFO-B/CLAR
threshold level (between 0 and 100) so scrambled
text is not displayed.
 Note that text will no longer be displayed for
weak signals if you increase the level too much.
 You switch between threshold level display and
normal display each time you press the [ SE-
LECT ] button.
FT 1200 O
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ecode with
RTTY DEC ODE
CQ CQ CQ D E J A
CQ CQ CQ DE W
※
Threshold Level Adjustment
] knob, and adjust the
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094 POLARITY-R
095 POLARITY-T
097 RTTY SHIFT
098 RTTY MARK FREQ
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 Cross talk, noise, phasing, and the like may prevent
correct display.
 If continuously sending for more than a few minutes
or if sending time is longer than receiving time, re-
duce transmit power output to between 1/2 and 1/3
using Menu item "177 TX MAX POWER".
To cancel the RTTY decode function, press and hold the
[ SCOPE ] switch again for one second or longer.
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 D C X
AF-FFT display (see page 40)
("Spectrum" or "Waterfall" display)
 The threshold level is displayed in the TFT dis-
play.
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peration
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A v
vAilAble AlueS
NOR ( normal ) / REV ( reverse )
NOR ( normal ) / REV ( reverse )
170 / 200 / 425 / 850 (Hz)
1275/2125 ( Hz )
AF-FFT
Threshold level
Page 103