— 11 —
NOTE:
The
Alarm
box
must be checked for the
alarm to function at all.
If left unchecked, the
alarm will not trigger!
There will be no program audio failover, no front-panel or
Web interface alarm indication, no ‘tally’ output, no email or
text notifications, no SNMP trap.
Threshold On
is the audio level that the program must drop
below to trigger an alarm. Moreover, the audio level must
stay below this point for the number of seconds pro-
grammed into the
Time On
box. Similarly,
Threshold Off
is the
audio level that the program must come back to, and stay
above for
Time Off
seconds, to reset the alarm.
The current level of the program audio shows as a shaded
bargraph behind the
Threshold On/Off
boxes. This makes it
easier to set the trip-point mark with reference to the pro-
gram audio. Of course, no audio will show unless that input
is connected. Be sure to set up the backup input source
alarm(s) when the program failover feature is used.
Stereo-Gen Setup
Setup of the stereo-generator (European ‘stereocoder’) is
under the
Setup/Outputs/Stereo Generator
menu.
Under the
Pre-Emphasis
submenu, select the characteristic
for your region.
75µs
(75 microseconds) is the standard for
the Americas,
50µs
for most of the rest of the world.
The
Stereo/Mono
submenu offers several operating options.
The NOVIA 272 defaults to
Stereo
stereophonic transmis-
sion.
Mono L+R
simply switches off the subcarrier and
broadcasts the combined left and right program channels in
mono. This might be a valid choice when programming is
speech-only, as it affords better noise performance in fringe
areas.
Mono L
or
Mono R
direct the chosen input chan-
nel to both the left and the right processor inputs.
Pilot Injection
is adjusted in this same submenu. The normal
injection level for the 19kHz stereo pilot tone is
9.0%
.
Multiplex Out
presents the slider to set the composite/MPX
output level of the NOVIA 272 for driving the FM exciter to
full modulation. The
MPX
level is variable between
1Vpp
and
— 12 —
6Vpp
(peak-to-peak volts), corresponding to 100% modula-
tion.
RDS Encoder
setup is the subject of Section IV.
GPIOs
Three rear-panel
GPO
(General Purpose Output) terminals
present alarm “tally” connections for remote indication of
program audio loss. The plastic connector body may be
unplugged from the chassis to make connection easier and
for quick disconnect.
GPOs are programmed
from the
Setup
/
Outputs
/
General Purpose Outputs
menu. The
Polarity:
of
Output:
1
,
2
or
3
may be
programmed as an
Active Ground
(the terminal goes to
ground for an alarm) or
Active Open
(the terminal normally
sits at ground and opens on an alarm).
Type:
may be as-
signed to
Analog Audio Loss
,
Digital Audio Loss
or
Stream Audio
Loss
.
None
inhibits the alarm terminal closure or open.
Alarms have the programmable parameters in the discus-
sion starting on Page 10.
Alarm GPO ‘tally’ outputs are the collectors of NPN transis-
tors that saturate to ground. Up to 100mA may be ‘sunk’ by
each of these outputs to operate relays or LED indicators
using an external voltage source up to 24VDC. The negative
side of the external power source must be returned to the
GND
(Ground) terminal on the rear panel; a 10mA current-
limited
+5V
source is provided as a convenience.
GPI
terminals serve only one application at present, setting
the RDS ‘TA’ (Travel Advisory) flag.
Under
Setup
/
Inputs
/
Gene-
ral Purpose Inputs
, you
may assign
General Pur-
pose Input: 1
,
2
or
3
to the
RDS TA Flag
and activate
the function either by grounding the designated GPI termi-
nal
(
Polarity:
Active Ground
), or by ungrounding the terminal
(
Polarity: Active Open
). The status of the command is shown
at the bottom of the menu screen.
