Icom IC-7610 Advanced Manual page 22

2. ADVANCED OPERATIONS
Operating RTTY (FSK) (Continued)
D Displaying the RTTY DECODE screen
With the built-in demodulator and decoder, received
RTTY signals are displayed on the RTTY DECODE
screen.
L The decode screen for the PSK mode differs
slightly from that of the RTTY mode.
» DECODE
MENU
RTTY DECODE screen
Decoded characters
Transmitting
Selected band (MAIN)
Transmitting contents
(Example: RT1)
NOTE: " " appears next to the transmitting
status indicator on the RTTY DECODE screen while
buffering. If this appears, stop typing for a while and
try transmitting again.
FFT scope
Tuning indicator
RTTY memory title
Waterfall display
D RTTY decoding
Rotate to tune a signal.
MAIN DIAL
L
Information
• 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.
In the RTTY mode, push
• The TPF function is turned ON, and the indicator on the
key lights.
L Pushing
turns the Twin Peak Filter function ON
APF/TPF
or OFF.
NOTE: When you are using the Twin Peak Filter, the
received audio output may increase. This is not a
malfunction.
18
RTTY-R mode
2125 Hz
Space
BFO BFO
APF/TPF .
APF/TPF
170 Hz
Mark
( Displayed
frequency)