On Nov 3, 10:40 pm, Mike Måne <[email protected]> wrote:
> Could somebody describe for me a simple explanation of how a 5 or
> 6-channel TX/RX device works?
Basically, an R/C system works as follows.
The TX contains 4 resistor pots, one for each joystick direction (up/
down/right/left) and two switches (connected to resistors), one for
each aux channel. The TX encodes the "position" of each control many
times per second and sends that encoded information over the RF link.
The RX receives the RF signal, decodes the position of each control
and then generates a "servo pulse signal" for each of six servo
channels. (Some receivers generate a single combined pulse signal,
but that's too detailed for this discussion.) The duration of each
servo pulse is directly proportional to the control position encoded
by the TX. In general, a pulse duration of 1.5 ms represents
"center", with 1.0 and 2.0 representing the normal endpoints. The
servo pulse is repeated every 20ms.
The servo simply reads the pulse and then moves it's arm to the proper
position, using a small motor, some gears and a feedback pot.
Modelers hook up the servo to either mechanical loads or mechanical
buttons depending on the application. There are also electronic
circuits designed to read the servo signal directly (thereby
eliminating the need for a servo at all) to control various things,
such as relays, actuators or motors. The most common such circuit is
an Electronic Speed Control (ESC) that reads the servo signal and
drives a motor at a variable speed, proportional to the throw of the
control on the TX.
Hope that helps.
Frank P.
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