Operating Rtty (Fsk); D About The Rtty Reverse Mode; D Twin Peak Filter - Icom IC-7300 HF Plus Full Manual

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4
RECEIVING AND TRANSMITTING

Operating RTTY (FSK)

With the built-in RTTY decoder and the contents set
in the RTTY TX memory, you can operate the basic
RTTY operation without using an external device.
L If you are using PSK software, refer to the software manual.
1. Select the RTTY mode.
2. Open the RTTY DECODE screen.
» DECODE
MENU
L You can select [DECODE] on the MENU screen only
while in the RTTY mode.
RTTY DECODE screen
3. Rotate to tune the desired 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.
• The S-meter displays the received signal strength,
when a signal is received.
• If you cannot decode correctly, try in the RTTY-R
mode.
• Tune to where both "◄" and "►" are displayed in
the tuning indicator.
4. Transmit the RTTY memory.
• The TX status indicator lights red and the Po meter
swings.
Lights red Lights red
Contents being transmitted are displayed.
(Example: transmitting the RT1's TX memory)

D About the RTTY reverse mode

If you are receiving an RTTY signal but cannot decode
correctly, try in the RTTY-R (reverse) mode.
Select the RTTY-R mode by touching [RTTY] on the
MODE screen.
L Touching [RTTY] toggles between the RTTY mode and
the RTTY-R mode.
170 Hz
Space

D Twin Peak Filter

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 external AF output on a PC.
1. While in the RTTY mode, display the Multi-
function menu.
2. Touch [TPF].
FFT scope
LTouching [TPF] turns the function ON or OFF.
Tuning indicator
3. To close the Multi-function menu, push
NOTE: When you are using the Twin Peak Filter, the
received audio output may increase. This is not a
malfunction.
4-22
RTTY mode Normal
2125 Hz
Mark BFO
Lights while the TPF is ON
RTTY-R mode
2125 Hz 170 Hz
BFO Space Mark
Push
.
EXIT