Hobby RC typically employs FM radio control in HF and VHF bands such
as 27 MHz, 49 MHz, and 72 MHz. Spektrum systems are distinguished in
that they use Spread Spectrum technology on the 2.4 GHz ISM band.
Spektrum refers to their technology as "Digital Spectrum Modulation."
Because of the relatively low noise in the ISM band, and the noise
immunity inherent in DSSM systems, Spektrum DSM is said to be free of "glitching"
(momentary corrupted or missing signals which can cause erratic movement
or loss of control). Additionally, the system "binds" each transmitter
to its particular receiver, ensuring that no transmitter will interfere
with other nearby Spektrum DSM systems.