Icom IC-9700 Instruction Manual advanced - Page 9

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. DDRTTY decoding Rotate MAIN DIAL to tune a signal. DDDisplaying the RTTY DECODE screen With the built-in demodulator and decoder, received RTTY signals are displayed on the RTTY DECODE screen. MENU » DECODE RTTY DECODE screen Decoded or transmitting characters FFT scope Selected band (MAIN) Transmitting Tuning indicator LLInformatio ••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 RTTY-R mode 170 Hz 2125 Hz 2125 Hz 170 Hz Waterfall display Space Mark (Displayed frequency) BFO BFO Space Mark (Displayed frequency) Key Action Selects the Function menus. Turns the Hold function ON or OFF. HOLD ••" HOLD " is displayed, and the RTTY DECODE screen stops. CLR Clears the displayed characters. ••While the Hold function is ON, this clears the characters and cancels the Hold function. TX MEM Opens the RTTY MEMORY screen. •• Sending the RTTY MEMORY RT1 ~ RT8. LOG Displays the RTTY DECODE LOG screen. ••Starts/Stops logging, selects the file type or the time stamp. LOG VIEW Displays the RTTY DECODE LOG VIEW screen. ••You can check the saved RTTY log files. ADJ Opens the THRESHOLD screen. You can adjust the threshold level. EXPD/ SET Touch Selects the Expanded or Normal screen. Touch Displays the RTTY DECODE 1 second SET screen. TIP: If you cannot receive, change the settings for "RTTY Mark Frequency" and "RTTY Shift Width." MENU » SET > Function > RTTY Mark Frequency MENU » SET > Function > RTTY Shift Width DDTwin 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 MULTI to display the Multi-function menu. 2. Touch [TPF]. LLTouching [TPF] turns the Twin Peak Filter function ON or OFF. 3. Push MULTI to close the Multi-function menu. NOTE: When you are using the Twin Peak Filter, the received audio output may increase. This is not a malfunction. 1-5