Operating Rtty (Fsk); D Displaying The Rtty Decode Screen; D Rtty Decoding; D Twin Peak Filter (Tpf) - Icom IC-9700 Advanced Manual

1. ADVANCED OPERATIONS

Operating RTTY (FSK)

The IC-9700 has a built-in RTTY decoder and
encoder. Using contents set in the RTTY TX memory,
you can do basic RTTY operations without using an
external device or software.

D Displaying the RTTY DECODE screen

With the built-in demodulator and decoder, received
RTTY signals are displayed on the RTTY DECODE
screen.
» DECODE
MENU
RTTY DECODE screen
Decoded or transmitting characters
Selected band (MAIN)
Transmitting
Key
<1>
Selects the Function menus.
<2>
Turns the Hold function ON or OFF.
HOLD • " " is displayed, and the RTTY
HOLD
DECODE screen stops.
Clears the displayed characters.
• While the Hold function is ON, this
CLR
clears the characters and cancels the
Hold function.
Opens the RTTY MEMORY screen.
TX MEM
• Sending the RTTY MEMORY RT1 ~ RT8.
Displays the RTTY DECODE LOG screen.
LOG • Starts/Stops logging, selects the file
type or the time stamp.
Displays the RTTY DECODE LOG VIEW
LOG
screen.
VIEW
• You can check the saved RTTY log files.
Opens the THRESHOLD screen.
ADJ
You can adjust the threshold level.
Selects the Expanded or
Touch
Normal screen.
EXPD/
SET
Touch Displays the RTTY DECODE
1 second SET screen.
FFT scope
Tuning indicator
Waterfall display
Action

D RTTY decoding

Rotate to tune a signal.
MAIN DIAL
Information
L
• Aim for a symmetrical wave form, and be sure the peak
points align with the mark (2125 Hz) and shift (170 Hz)
frequency lines in the FFT scope.
• Tune to where both "◄" and "►" are displayed in the
tuning indicator.
• The S-meter displays the received signal strength,
when a signal is received.
• If you are receiving an RTTY signal but cannot decode
correctly, try in the RTTY-R (reverse) mode.
RTTY mode Normal
170 Hz 2125 Hz
Space
Mark
( Displayed
frequency)
TIP: If you cannot receive, change the settings for
"RTTY Mark Frequency" and "RTTY Shift Width."
» SET > Function > RTTY Mark Frequency
MENU
» SET > Function > RTTY Shift Width
MENU

D Twin Peak Filter (TPF)

The Twin Peak Filter (TPF) changes the audio
frequency response by boosting the mark and space
frequencies for better reception of RTTY signals, or
for decoding the AF output signal on a PC.
1. Push to display the Multi-function menu.
MULTI
2. Touch [TPF].
L Touching [TPF] turns the Twin Peak Filter function
ON or OFF.
3. Push to close the Multi-function menu.
MULTI
NOTE: When you are using the Twin Peak Filter, the
received audio output may increase. This is not a
malfunction.
1-5
RTTY-R mode
2125 Hz
Space
BFO BFO
170 Hz
Mark
( Displayed
frequency)