Spektrum AR9020 Guide De L'utilisateur page 3

DSMX
®
Spektrum launched the 2.4GHz RC revolution with its DSM2™ technology. Since
then, millions of hobbyists the world over have come to embrace 2.4 as the way
to ly. Spektrum leads the way yet again with DSMX—the world' s irst wideband,
frequency-agile 2.4GHz signal protocol.
How Does DSMX Work?
It' s a crowded 2.4GHz world out there and every 2.4GHz system faces the same
challenges. DSMX better equips you for these challenges by combining the supe-
rior data capacity and interference resistance of a wideband signal (like that used in
DSM2) with the agility of frequency shifts.
Compared to the wideband signal of DSMX, the narrow band signal of other
frequency hopping 2.4 transmitters is more likely to suffer data loss in the event of
on-channel interference. Think of it as a river vs. a stream. It takes more interferen-
ce to dam a river than it does a stream.
As more and more 2.4 transmitters vie for the same number of available channels,
there is more interference and more of a risk for data loss. By adding the agility of
frequency shifts to the superior interference resistance of a wideband signal, DSMX
is far less likely to suffer signiicant data loss from on-channel interference. The
result is quicker connection times and superior response in even the most crowded
2.4GHz environment.
DSMX Operational Differences
DSMX transmitters and receivers function nearly identically to Spektrum DSM2
systems. Binding, setting the failsafe, recording light log data, as well as general
use of the system is no different than using any current Spektrum system.
Following are the operational differences:
Brownout Detection - Not Available on DSMX Receivers DSM2 receivers feature
Brownout Detection that lashes the receiver' s LED if a power interruption occurs.
While DSMX receivers have QuickConnect
a power interruption, the architecture of DSMX prevents Brownout Detection when
operating in DSMX mode.
Flight Log Recording-Fades Higher than DSM2
Note that DSMX hops through the band while DSM2 inds two quiet channels and
remains on those channels. Consequently because DSMX operates on quiet and
noisy channels, it' s common to have more Antenna Fades than when using DSM2,
when used in busy 2.4GHz environments. When taking light log data readings, the
Frames and Hold Data are important and should be used a reference while Fades
are insigniicant due to the nature of frequency hopping. A 10-minute light will
typically result in less than 50 Frame Losses and no Holds.
Just How Good is DSMX?
In multiple tests, 100 DSMX systems were operated simultaneously for extended
periods of time. During these tests each of the 100 systems was monitored in light
and on the ground. In every test not a single case of RF link loss, latency increase
or control degradation was experienced or recorded.
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