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CAUTION
Control of models is impossible with insufficient or no voltage in
the transmitter or receiver. A receiver battery, that is too weak will
move the servo(s) very slowly, and that may cause erratic operation
of your model. When using a car that operates both the electric
motor and receiver on the same battery, such as a BEC system,
you should discontinue operating the car, when the top speed
becomes sharply reduced, otherwise loss of control will result soon
afterwards.
FEATURES OF THE 2.4 GHZ REMOTE CONTROL
The transmitter technology at 2.4 GHz is fundamentally different
in some aspects from the technology in the 27.35 and 40 MHz
frequency ranges, which up to now have been conventional
with remote control models. The previous style of location
using a channel determined by plug-in crystals is gone, and the
transmitter and receiver work with encoding. The receiver accepts
only signals with the coding from its own transmitter. Each signal
from the transmitter lasts just milliseconds. Before the next signal,
a pause is inserted, which lasts longer than the transmission signal.
Nonetheless, within each second countless signals are received
and evaluated by the receiver. Signals that the receiver recognizes
as defective (false encoding, strings that don’t fit the signal
schema, etc.) are suppressed and are not passed on as control
commands.
And as the frequency gets higher, the antennas get shorter.
Remote controls using this transmitter technology or model
construction are not subject to fees.
ADVANTAGES OF THE 2.4 GHZ TECHNOLOGY
WORTH NOTING
Although the frequency range used is also divided into channels,
the user doesn’t have to worry about their configuration and has
no influence on it anyway.
Because the same encoding is used by the transmitter and
receiver, interruption by another receiver or a different transmitter
will not occur.
Plug-in crystals are not needed, because the transmitter creates
the currently appropriate frequency using a synthesizer circuit,
as does the receiver, which determines the right frequency for ist
encoding.
The old fear of double occupancy of a channel (as when a second
transmitter overreaches and interrupts a receiver) is a thing of the
past. An operator can go ahead and switch on a transmitter and
receiver, without negotiating with other model users.
The data transfer capacity is considerably larger than that of
previous remote controls, which has a positive effect on control of
the digital servo, for example.
Best of all, at events with a lot of participants, you can always use
your own equipment for settings, tests and conversions, because
the number of active transmitters is almost unlimited.
At very low wavelengths, obstacles can weaken or interrupt
the spread of radio waves. That means there should be as few
obstacles as possible in the line between the transmission and
reception antennas.
The model’s receiver antenna must be as far away as possible from
electrically conductive parts and very visibly arranged (protruding
from the model) to prevent loss of range.
