FTDX1200 Operating Manual Page 103

RTTY (RADIO TELETYPE) OPERATION
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The FTDX1200 has capabiltiy of a RTTY decode function when the optional FFT unti is installed. You can easily 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 Memu Mode.
RTTY DECODE (WITH OPTIONAL FFT UNIT)

    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".

ADVICE:

Press and hold the [MODE] for approximately one second to switch back and forth between "RTTY USB" and "RTTY LSB".

Generally, amateur band stations operate RTTY in USB.

    3. Tune to a RTTY signal, press and hold the [SCOPE] switch for one second or longer.
The RTTY DECODE screen displays, and the decoded test is displayed on the screen.

ADVICE:

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 [VFO-B/CLAR] knob to adjust the threshold level.

* 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.




NOTE:

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, reduce 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.

End of "RTTY Decode (with Optional FFT Unit)"


Threshold Level Adjustment

Scrambled text may be displayed due to noise and band clutter, when a signal is not being recived. You can adjust 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 the 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 [SELECT] button.

The threshold level is displayed in the TFT display.

End of "RTTY Threshold Level Adjustment (with Optional FFT Unit)"

Cont'd Next Page "RTTY (Radio Teletype) Operation"
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FTDX1200 Operating Manual Page 103