ICOM 301500 Manuale Utente

40

4

RECEIVE AND TRANSMIT

D RTTY reverse mode

Received characters are occasionally garbled when 
the receive signal is reversed between MARK and 
SPACE. This reversal can be caused by incorrect 
TNC connections, settings, commands, etc.

To receive a reversed RTTY signal correctly, select 
RTTY-R (RTTY reverse) mode.

q  Push 

 to select RTTY mode.

w  After RTTY mode is selected, push and hold 

 for 1 sec. to toggle between RTTY and 

RTTY-R modes.

Reverse

Normal

BFO

170

Hz

2125

Hz

170

Hz

2125

Hz

BFO

Mark

Space

Displayed freq.

Displayed freq.

Mark

Space

D Twin peak filter

The twin peak filter changes the receive frequency 
response by boosting two particular frequencies 

(2125 and 2295 Hz)

 for better copying of desired RTTY 

signals.

q  Push 

 to select RTTY mode.

 • 

 

After RTTY mode is selected, push and hold 

 

for 1 sec. to toggle between RTTY and RTTY-R modes.

w  Push and hold 

 for 1 sec. to enter the 

quick set mode.

e  Rotate [M-CH] to select “TPF”, then rotate [DIAL] 

to select the twin peak filter function ON or OFF.

 • 

 

The received audio volume may become greater when 
the twin peak filter is turned ON.

r  Push 

 to exit the quick set mode and re-

turn to normal operation.

OFF (default)