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the less sinister condition of the expected signal going off-air
and a distant on-channel broadcast received in its place.
To enable the PI mis-
match function, enter
the station’s true PI
code in the
PI Code:
box. The code being received at the moment is shown as the
Current PI:
. If that’s your station you can enter that hex value as
shown and then click
Save
.
There are no threshold settings for RDS alarms, and both RDS
loss and PI mismatch share the same
Time On (Sec):
and
Time Off
(Sec):
settings, which work the same way as alarms already dis-
cussed.
RT Update
When a playout system ‘sticks’ while sending RDS RadioText, it
can cause problems… not only the display of RadioText, but
the attendant RT+ functions as well.
Turn the
Alarm: On
and set a
Time On (Min):
at a nominal figure of
20 minutes or so to alert personnel to a ‘stuck’ RadioText field.
Threshold-
Independent
Alarms
Some alarms, especially those associated with the HD Radio
system, are not constrained by a range of analog signal levels.
These alarms fall into this category and are set-up in similar
fashion:
Pilot Loss
,
HD Loss
and
HD Program Loss
.
Pilot Loss
This alarm indicates loss of the FM stereo pilot, a rare transmit-
ter plant failure mode but still an included alarm. There is no
threshold setting, just
Time On (sec): and Time Off (sec):
.
HD Loss
This alarm flags the loss of general HD signal acquisition, more
indicative of an exporter/importer/exciter fault than a concur-
rent HD program audio loss alarm. Other than what triggers it,
this works just like the
Pilot Loss
alarm.
HD Program
Loss
Similar to the
HD Loss
alarm,
HD Program Loss
flags the loss of
individual HD channels, again loss of the complete program
channel, not just loss of audio. The
Alarm:
button array selects
the channels to be monitored for loss;
Time On (sec): and Time Off
(sec):
settings apply to any and all channels selected.
HD Power Level
The power level of the HD Radio signal is expressed in dBc, or
dB below the resting level of the host FM carrier. Subject to the
station license, levels can be –20dBc, –14dBc or –10dBc.
The HD Power Out of
Range alarm is set
with the
Limits (dBc):
‘window’ slider, an al-
ternate means of pro-
gramming a range of
acceptable figures sim-
ilar to 552 ‘hysteresis’
settings for alarms. The slider has two buttons, the upper one
set for the highest dBc value of acceptable power, the lower one
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