Icom IC-7760 Advanced Manual page 24

2
ADVANCED OPERATIONS
Operating RTTY (FSK)
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 signal strength, when a signal is
received.
• If you are receiving an RTTY signal but cannot decode
correctly, try the RTTY-R (reverse) mode.
RTTY mode Normal
170 Hz 2125 Hz
Space Mark
BFO
( Displayed
frequency)
TIP: If you cannot receive, change the following
settings.
» 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.
z Push to turn ON the Twin Peak Filter.
APF/TPF
APF/TPF
• The TPF icon is displayed, and the TPF indicator on
lights.
APF/TPF
L Pushing turns the function ON or OFF.
APF/TPF
L You can also turn the function ON or OFF on the
FUNCTION screen.
NOTE: When using the Twin Peak Filter, the
received audio output may increase. This is not a
malfunction.
RTTY-R mode
2125 Hz 170 Hz
Space Mark
BFO
( Displayed
frequency)
D Using the RTTY Memory function
You can transmit the preset characters on the RTTY
MEMORY screen.
Transmitting
1. Display the RTTY DECODE screen in the RTTY
mode.
» DECODE
MENU
2. Touch [TX MEM].
3. Touch an RTTY memory between [RT1] and [RT8]
to transmit. (Example: RT1)
Transmitting
Transmitting contents are displayed.
• The TX status indicator lights red and the Po meter
swings.
L To cancel the transmission and to return to the RTTY
DECODE screen, push
L After transmitting, automatically returns to receive.
Key
RT1 ~ RT8 Touch
Reduces the contest number counter by 1 (001).
–1 • You can change or reset the number in
001 "Present Number" in the RTTY 001 menu.
(p. 2-18)
EDIT/SET Displays the EDIT/SET screen.
2-14
.
EXIT
Action
Sends the memory contents.