Aaronia SPECTRAN HF-2025, Руководство пользователя

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5.5 Operation mode audio output (Demodulation):
(The DISPLAY MODE status field shows “AM” or “FM”)
All SPECTRAN units offer a so-called Demodulator . The
demodulator makes pulsing and modulation of a signal
source
audible (if it exists).
The frequency-exact, selective acoustic reproduction of a
signal can be very helpful with identifying and finding a
signal source. As demodulation takes place in realtime, it
is also perfectly suited for quickly locating a signal sour-
ce.
SPECTRAN offers two demodulation modes:
AM (amplitude modulation)
FM (frequency modulation).
To switch between the two modes, use the dot key (the DISPLAY MODE sta-
tus field shows “AM” or “FM”).
Volume can be adjusted with the volume control on the
left.
ATTENTION: During audio analysis, the complete dis-
play is “frozen” and the pixel display is shut off to
free up enough CPU power for demodulation. Hence,
ONLY an acoustic reproduction takes place!
In contrast to simple broadband detectors, demodulation
only happens at a certain single frequency (center fre-
quency) with SPECTRAN. Hence, you can selectively
“monitor” very narrow frequency ranges. Please note though that in this mode,
filtering is a bit less effective, which might lead to very strong neighboring sig-
nals also being audible on the actually selected frequency.
For optimal acoustic reproduction of signals, you can select different filter band-
width using the
Up/Down arrow keys . The selected filter is displayed in the
large INFO display. possible filters are:
FULL (50MHz)
3MHz
1MHz
300kHz
100kHz
5.0 Your first measurements / Modes
15
Display is “frozen”
Pixel display is shut off