Icom IC-7600 Instruction Manual - Page 54
◇ About RTTY reverse mode, ◇ Twin peak filter, RTTY/PSK], APF/TPF]
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4 RECEIVE AND TRANSMIT D About RTTY reverse mode Received characters are occasionally garbled when the received signal is reversed between Mark and Space tones. This reversal can be caused by incorrect TNC connections, setting, commands, etc. To receive a reversed RTTY signals correctly, select RTTY-R (RTTY Reverse) mode. ➥ D uring RTTY mode, push and hold [RTTY/PSK] for 1 sec. to select RTTY-R mode. • Check the received signal. Normal 170 Hz 2125 Hz Reverse 2125 Hz 170 Hz Space Mark BFO BFO Space Mark D Twin peak filter The twin peak filter changes the audio frequency response by boosting the mark and space frequencies (2125 and 2295 Hz) for better reception of RTTY signals. ➥ D uring RTTY mode, push [APF/TPF] to turn the twin peak filter ON and OFF. • " " appears in the LCD and the indicator on this switch lights green while the filter is in use. NOTE: When the twin peak filter is in use, the received audio output may increase. This is a normal, not a malfunction. APF/TPF 47