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AARON 650 READOUTS AND METERING
The AARON 650 offers an array of meters and data readouts
that can be used to advantage in setting-up the unit and moni-
toring incoming and outgoing signal quality. The front-panel
OLED display offers exceptional resolution for a 1U presenta-
tion, and the Web interface echoes the same information on any
PC, tablet or mobile phone with network access.
The most useful ‘global’ displays will be described here at the
outset, as they may have frequent reference. The more specific
displays will be discussed along with their applications.
The Now-Playing
Screen
Now Playing
is at the top of
the Main Menu. Highlight
this item and
push
the knob
to bring up a readout of sta-
tion information. This dis-
play always shows what is coming in off-air, even in the Stereo-
Regen mode (Page 24) of operation.
Top row: 1)
The frequency that the AARON 650 is tuned to;
2)
The RDS PI code;
3)
Station call letters (these are derived
from the PI code in the US and Canada);
4)
The antenna select-
ed at the moment.
Second row:
1)
The RDS PS field;
2)
The RDS Radio Text field.
Bottom row: 1)
Incoming carrier signal strength in dBuV;
2)
The current IF bandwidth;
3)
Multipath distortion relative to
carrier modulation;
4)
Ultrasonic noise relative to carrier
modulation.
Graphs and
Metering
The
Graphs & Metering
sub-
menu is a bit farther down
the Main Menu. Navigate
there and
push
the knob to
bring up this screen.
Baseband FFT
The first item,
MPX FFT
will give you a spectrum display of the
composite/MPX baseband signal
leaving
the AARON 650. This
means that, in the Pass-
Through mode, you will see
the off-air signal, and in the
Stereo-Regen mode it will be
the regenerated composite/
MPX.
This is one of the more useful displays. Viewing this you can
determine the injection levels of the stereo pilot and all subcar-
riers, view FM baseband noise and anomalies, and see the effect
of different IF bandwidths in the Pass-Through mode. Refer to
this spectrum plot as you switch between Pass-Through and
Stereo-Regen to get an idea of how much ‘cleaner’ one mode is
than the other.
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