Spektrum SPM20200 DX2.0 - Manual (Page 5)

The DSM ® system operates in the 2.4GHz band (that’s 2400MHz). This high frequency offers
a significant advantage as it’s well out of the range of model-generated radio interference
(like motor and ESC noise). All the complex issues that now exist using 27 and 75MHz
radios with model-generated interfering noise are eliminated with this system. The DSM
system uses Direct Sequencing Spread Spectrum modulation to generate a wide signal on a
single frequency. The FCC requires that these systems be “smart”– incorporating collision
avoidance such that when a system is turned on, it scans the 2.4GHz band and selects a
channel that is not being used, then begins transmitting on that unused channel. 79 channels
are available and the odds of one DSS spread spectrum system interfering with another are
astronomically remote. The 2.4GHz spectrum has a capacity of 79 channels. In the unlikely
event that the spectrum is full, the 80th system will not connect or cause any interference
going into hold scan until a channel is free.
DX2.0 with
Digital
Spectrum
Modulation