User's Manual

Screen Service SDT ARK 1 ECHO Operations
Jan, 2012 v 1.ATSC_FCC Page 3 - 82
RF Input Squelch
Rx level under the Squelch threshold.
H/R

Check Squelch alarm threshold

Check input channel

Check RF input source and signal
X
RF Digital Ber. Alarm
Demodulator BER over the alarm threshold.
H/R

Check BER alarm threshold

Check RF input source and signal
X
File System Error
File System loading error.
H/R

File system partition damage
0
Bad File in File system
One more files missing in the File System.
H/R

Check files list

Reload the file system
0
1PPS Lock
1PPS is not lock to the selected frequency reference.

If the frequency reference is Internal: internal PLL fault

If the frequency reference is External:
o Internal PLL fault
o Lack of external 1PPS
o Hardware faul

If the frequency reference is Internal:
o Check GPS alarms
o Internal PLL fault
o Hardware fault
X