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HD Carrier Loss
The
HD Carrier Loss
alarm is turned
On
or
Off
with the Web in-
terface
Alarm
: button, as shown here, or with the
Alarm
checkbox on the front-panel OLED menu. This alarm responds
to the presence or absence of the HD1 digital ‘carrier’. There
are no threshold settings, only
Time On (s):
for the alarm to ac-
tivate once the HD1 signal is lost, and
Time Off (s):
for the alarm
to reset when HD1 is reacquired.
The HD Radio digital signal
is actually quite robust, de-
spite its power subservience
to the analog FM carrier.
Yet it retains the character-
istic of any digital ‘go’
or ‘no-go’ situation.
‘Hits’ on this alarm may
be correlated with the
HD
bargraph on the
front-panel OLED
Tuner
menu, or with the
Digital Quality
numeri-
cal readout on the Web interface
Now Playing
screen.
Alignment
Out of Range
This alarm triggers when FM-to-HD1 alignment exceeds a preset
number of
Threshold On (smp)
samples for a preset
Time On (s):
interval.
Any ‘glitch’ in the HD exciter/exporter operation that causes
time alignment to slip will, of course, prompt the JUSTIN 808 to
re-correlate and begin readjusting the delay to bring the FM and
