Inovonics Dante 551, Installation & User Manual

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mum/minimum figures for the time period. Some of these pa-
rameters, along with others not in this grid, are displayed
graphically in much greater detail and with selectable time scal-
ing on the History Plots Webpage.
Readouts in the top row give, in order:
RSSI
, the incoming FM
carrier strength in dB (relative to 1 microvolt at the antenna in-
put);
RF SNR
, or signal-to-noise in percent, relative to an ideal
signal;
Multipath
distortion in the incoming signal, again relative
to ‘ideal’; and Pilot shows the 19kHz stereo-pilot frequency.
The next two rows pertain to the quality of the decoded HD Ra-
dio OFDM/HDC-coded carrier pair. The expressed measure-
ments indicate quality or ‘confidence factor’ of the signal, and
generally ‘the higher the number the better’ is the objective in
all cases.
In brief,
HD Power is the ‘dBc’ figure for the level of the HD car-
rier pairs with relation to the associated FM ‘host’ carrier level.
HD
simply indicates whether or not the HD Radio signal is
locked-in by the receiver, and the DQ readings for each of the
preselected HD Radio program are confidence readings in per-
cent, again based on ideal reception.
As just witnessed, much of the HD Radio terminology has been
coined by the system developers and may not be familiar within
all broadcast engineering circles. For an in-depth discussion of
the HD Radio system, the reader is first directed to the relevant
Wikipedia article here:
https://en.wikipedia.org/wiki/HD_Radio
Additionally, a bibliography at the end of the cited article will
suggest further reading.
The Alarm Panel
This field of alarm indicators lists twenty possible fault alarms.
Alarms that have been enabled by the user are noted in white
text; grayed-out alarms are turned off. Once an alarm registers,
depending on signal level and on/off timing settings, the simu-
lated red LED lights. The example above illustrates a station’s
signal lost, the only reason that the HD2 and HD3 Audio Loss
indicators are not lit is that the alarm-on time for those two
channels has not yet elapsed.
This Now Playing alarm panel is a duplicate of what’s shown on
the
Alarms
Webpage. Setup of the alarms is detailed in that dis-
cussion section.