Spektrum SPM1014 User Manual
Page 6
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 Sequence 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.
DSM
Digital Spread
Spectrum Modulation