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FM BandScanner
The next
Graphs & Metering
item, the
BandScanner
, gives an RF
spectrum display of the incoming signals at carrier frequencies.
Here you can set the
Center Freq
of the display, the
Step Size
, or
resolution bandwidth, and the
RSSI Range
where the vertical
range of the 10dB/div display may be scaled to meet signal
strength criteria. Bracket and select
Scan
to initiate the spec-
trum plot.
This shot is a wide-range
analysis centered at 98.1
MHz with a step size of
100kHz. Here you see the
entire FM band with the in-
dividual carriers of stations
in the local market.
Zooming-in on the station
at 94.7MHz, and narrowing
to 10kHz steps, clearly
shows the main carrier, the
narrow HD Radio® digital
carrier pair, and the signifi-
cant adjacent channels.
The BandScanner is a handy utility for checking possible
sources of adjacent-channel interference. It is normally used
for aiming the receive antenna and other AARON 650 initial
setup steps for the reason that follows.
NOTE:
When the BandScanner is in use, the program signal go-
ing through the AARON 650 will be temporarily compromised.
You will experience a ‘burbling’ in the MPX and program out-
puts during the scan.
Reception Tools
Processing
The next
Graphs & Metering
menu item,
Processing
, displays the
real-time action of the three Reception Tools that can improve
performance in the Stereo-Regen mode when the incoming sig-
nal is less than optimal.
The criteria for these Reception Tools are explained under Re-
ception Tools beginning on Page 29. These readouts are actual-
ly redundant to similar displays associated with each of the Re-
ception Tools, but on this menu screen they incorporate a peak-
hold feature, have a higher readout resolution, and allow view-
ing all three readouts at once. Page numbers noted here refer
to the corresponding Reception Tools setup notes.
Highcut
shows the amount of high-end audio rolloff imposed on
the demodulated and decoded L/R stereo program signal when
poor reception conditions would otherwise contribute an an-
noying hiss to the program. The percentage figure at the end
of the scale is somewhat arbitrary, but does depict the working
range of this audio control. (Page 32)
Summary of Contents for AARON 650
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