Yaesu FT DX 1200, Руководство по эксплуатации

Страница: 105 / 140

Page 103
FT
DX
1200 O
PERATING
M
ANUAL
RTTY
(
R
ADIO
T
ELETYPE
)
O
PERATION
The FT
DX
1200 has the capability of a 5 TTY decode function when the optional FFT unit is installed. You can easily
synchroni ] e by aligning the marker displayed on the $ F-FFT screen, together with the decode screen while receiving a
signal. 0 ark fre T uency 1 H ] ), SHIFT width 170 H ] ), and baudot code US) can be changed in 0 enu 0 ode.
RTTY D
ECODE
(
WITH
O
PTIONAL
FFT U
NIT
)
1. Before operating, set the 0 enu items in the chart to
the right.
. 3 ress the [ MODE
] switch, set the operating mode to
“ RTTY LSB ”.
A
DVICE
:
ˆ 3 ress and hold the [ MODE
] switch for approxi-
mately one second to switch back and forth between
“
RTTY USB ” and “ RTTY LSB ”.
ˆ
Generally, amateur band stations operate 5 TTY in
LSB.
3. Tune to a 5 TTY signal, press and hold the [ SCOPE
]
switch for one second or longer.
The 5 TTY '( C 2'( screen displays, and the de-
coded text is displayed on the screen.
A
DVICE
:
ˆ $ lign the peak of the received signal with the mark
fre T uency and shift fre T uency marker of the $ F-FFT
screen.
ˆ
If text is displayed due to noise and band clutter,
when a 5 TTY signal is not being received, turn the
[
VFO-B/CLAR
] knob to adjust and threshold level.
M
ENU
I
TEM
A
VAILABLE
V
ALUES
094 POLARITY-R NOR (normal) / REV (reverse)
095 POLARITY-T NOR (normal) / REV (reverse)
097 RTTY SHIFT 170 / 200 / 425 / 850 (Hz)
098 RTTY MARK FREQ 1275/2125 (Hz)
Threshold Level Adjustment
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
] knob, and adjust the
threshold level between 0 and 100) so scrambled
text is not displayed.
ˆ
1 ote that text will no longer be displayed for
weak signals if you increase the level too much.
ˆ
You switch between threshold level display and
normal display each time you press the [ SE-
LECT
] button.
ˆ The threshold level is displayed in the TFT dis-
play.
N
OTE
:
ˆ
Cross talk, noise, phasing, and the like may prevent
correct display.
ˆ
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
and 1 3
using 0 enu item “
177 TX MAX POWER
”.
To cancel the 5 TTY decode function, press and hold the
[
SCOPE
] switch again for one second or longer.
Displays the decoded RTTY
signal.
Displays content written to
the RTTY text memory
ɦ
ɦ
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.
#(((6
%3 %3 %3 &' 9
:
Ჾ & %
%3 %3 %3 & , # ' Ჹ
466;&'% 1&'
AF-FFT display (see page 40)
(“Spectrum” or “Waterfall” display)
Threshold level