Icom IC-7610 Instruction Manual advanced - Page 22

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