D About Rtty Reverse Mode; D Twin Peak Filter - Icom IC-7600 Instruction Manual

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 incor-
rect TNC connections, setting, commands, etc.
To receive a reversed RTTY signals correctly, select
RTTY-R (RTTY Reverse) mode.
During RTTY mode, push and hold [RTTY/PSK]
for 1 sec. to select RTTY-R mode.
• Check the received signal.
D Twin peak filter
The twin peak filter changes the audio frequency
response by boosting the mark and space frequen-
cies (2125 and 2295 Hz) for better reception of RTTY
signals.
During 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 nor-
mal, not a malfunction.
47
Normal
170 Hz 2125 Hz
Space Mark
BFO
Reverse
2125 Hz 170 Hz
Space Mark
BFO
APF/TPF