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ing carrier falls and stays below a programmed threshold value.
Units of measure in this case are dBuV, rather than the dB asso-
ciated with the audio program level threshold.
Audio Muting
The
Low Signal
alarm has one additional feature. When the
Mute
box is checked, program audio will be interrupted
(turned off!) during the alarm condition. The
Alarm
box must
of course be checked as well. This is true in both the Pass-
Through and the Stereo-Regen modes.
RDS Error
Enter the
RDS Error
setup
menu to access these op-
tions.
When the
Alarm
is set (box
checked), loss of the 57kHz
RDS subcarrier will initiate an ala rm following the interval en-
tered in the
Time On
box. Once the RDS subcarrier returns, and
remains for the period entered in the
Time Off
box, the alarm
will reset.
The
RDS Error
alarm may also be used to guard against ‘hijack-
ing,’ which refers to receiving a distant station when the main
signal is lost, or some nefarious pirate taking over the legiti-
mate broadcaster’s translator. The
RDS Error
utility may be pro-
grammed to give an alarm when the incoming PI code does not
match the code programmed into the AARON 650.
The PI code of the incoming carrier shows up in the
PI
box at
the lower-right of the menu screen. Make note of this code and
then highlight the
PI Code
box and push the knob.
Using
Backspace
, remove the
four factory-default zeros
and enter the PI code of the
incoming carrier. Execute a
Save
to return to the
RDS Er-
ror
menu screen. Now check th e
PI Error
box to engage the an-
ti-hijacking feature. The
Alarm
box must also be checked for
the feature to function.
Pilot Loss
An incoming signal that contains the 19kHz stereo pilot tone in
the FM baseband will light the front-panel
STEREO PILOT
indi-
cator whether the
Pilot Loss
alarm is armed or not. This LED is
an instantaneous indicator of stereo pilot presence and is inde-
pendent of the Pilot Loss alarm.
Open the
Pilot Loss
alarm setup menu. You may turn the
Alarm
on here by checking the box. The figure you enter in the
Time
On
box will fix the interval between loss of pilot and the alarm;
the
Time Off
setting determines how fast the alarm resets after
the pilot returns.
Summary of Contents for AARON 650
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