SITOR-B (FEC)

This mode can be used to monitor FEC and NAVTEX transmissions at 100 baud. 


 

There are three indicators, marked PHASE, BAD, and OK.

The PHASE indicator will light up blue when phasing signals are being received. These are typically sent at the beginning and end of transmissions, and during transmissions as filler. 

The BAD OK indicator will light up red when garbled or invalid characters are being received.

The OK indicator will light up green when valid characters are being received.

When first tuning in a station, the BAD indicator will light up, until the reception is synchronized with the transmission. It may also light up during reception, if the lock on the signal is lost due to interference. 

NAVTEX transmissions may be found on 518 KHz.