Spektrum SPMAR12200 - Manual (Page 3)

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Spektrum launched the 2.4GHz RC revolution with DSM2™ technology. Since then,
millions of hobbyists the world over have come to embrace 2.4 GHz as the way to
fly. Spektrum leads the way yet again with DSMX® technology; the world’s first
wideband, frequency-agile 2.4GHz signal protocol.
How Does DSMX Work?
DSMX combines the superior 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 GHz transmitters are 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
interference to dam a river than it does a stream.
As more and more 2.4 GHz 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 technology is far less likely to suffer significant 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 flight log data, as well as general
use of the system is no different than using any current Spektrum system.
Brownout Detection—Not Available on DSMX Receivers
DSM2 receivers feature Brownout Detection that causes the receiver’s LED to flash
if a power interruption occurs. While DSMX receivers have QuickConnect™ and
recover instantly from a power interruption, the architecture of DSMX prevents
Brownout Detection when operating in DSMX mode.
Flight Log Recording—Fades Higher than DSM2
DSMX uses frequency shifts through the band while DSM2 finds 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 in busy 2.4GHz environments. When taking flight log data readings, the
Frames and Hold Data are important and should be used as a reference, while
Fades are insignificant due to the nature of frequency agile systems. A 10-minute
flight 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 flight
and on the ground. In every test, not a single case of RF link loss, latency increase or
control degradation was experienced or recorded.