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DelTang Rx66 DSM2/DSMX Receiver for Land-Based Vehicles
Rx66 is a 2.4GHz DSM2/DSMX receiver which includes one integrated 4A reversable controller for brushed motors (ESC). The motor stall current must be less than or equal to the ESC current rating; this can be increased to 6A using a heatsink. The voltage range is 3-18v for 1-4S LiPo, 1-5 LiFe, 3-12 NiCd/NiMH or 1-2 PP3.
Rx66 is available as board-only for you to add wiring or with a range of pre-wired leads / connectors. If the options below do not exactly meet your needs, please contact us to discuss your requirements.
An enormous range of programming features are provide to enable you to customise the operation of Rx66 to suit your model. See Rx66 v611 Programming for full details. Access to programming is either via a stick type transmitter or using the PROG3 programmer. A selection of program setups are provided as variants (-1, -2, etc.) - view the Variants tab for details.
The Rx66 has 1 x H, 8 x P and 3 x F outputs.
H: Rx66 is intended for surface vehicles which require forward and reverse motor control. For brushed motors this is achieved with an H-Bridge - the H outputs. H outputs have 256 step resolution in both directions (512 total). They control speed with pulse width modulation (PWM) which, by default, is set to its fastest (quietest) 12kHz setting.
Each H output can handle up to 4A current (6A with heatsink). The main constraint with current is heat in the receiver. Higher currents may be possible if heat sinks are added or the PWM frequency is reduced to 200Hz. Rx65 has one integrated ESC (H1). How the outputs are used has to be set with programming. Receivers are provided 'pre-programmed'. The default settings are shown on the instructions pages for each variant.
P: 'P' outputs are 'pads' with 'logic' type outputs. Pads are simply solder points for controlling external things. Logic outputs are either on or off (also known as high/low and 3.5v/0v in voltage terms). The action can be inverted so 'On' can mean 0v or 3.5v. P outputs are used to provide servo signals direct to the white/yellow lead on a servo. They can be used to directly control triggers on external sound cards - a series resistor, of 4k7 ohm or more, must be used if the external trigger open circuit voltage is greater than 3.3V. P outputs are also used to drive LEDs and need a resistor to limit current to no more than 20mA.
F: 'F' outputs are 'buffered' P outputs capable of controlling up to 2A. The buffer is a FET (Field Effect Transistor). These provide a path to ground (0v) when on and are floating (disconnected) when off. Technically they are called 'open drain' (the equivalent with a transistor which is more widely known is called 'open collector'). The Rx65 main board provides 3 x 'F' outputs, labelled A, B and C. F outputs are often used to control sound cards and lights.
The default receiver setting is for the Low Voltage Cutoff (LVC)
threshold to be determined
from the voltage seen on initialisation - basically, the receiver
firmware makes a 'guess' at the battery type.
The algorithm used for this calculation means that a 9V Alkaline or NIMH
battery can often be
interpreted as an almost discharged 3S LiPo. The solution is to either
disable LVC, or set it to the correct value for your
battery; this is done by programming the receiver.
Instructions for programming receivers using your DT transmitter are at
the bottom of the information leaflet that came with the transmitter.
The receiver programming steps for LVC are:
e.g. to set the LVC to 6.5V, the programming steps are: 7 2 3 6 5
The receiver is normally supplied as a bare board, with wiring options as specified in the menus below. If you want the receiver protected against accidental contact with metal parts, please select the 'heatshrink' option.
Receiver Variation, Antenna and Wiring Options:
throttle control method applies only to -2 and -22 variants
The receiver has a low-voltage cutoff facility which stops the motor when the battery has reached its discharge voltage. The default setting is for LiPo batteries. If you are using NiMH, the LVC should be disabled - see Low Voltage Cutoff tab.
The cover must be applied before a heatsink is installed as a hole must be cut in the heatshrink cover around the FET devices to enable the heatsink to contact them.
Spare 150mm aerials are available for the extended aerial version of Rx65, Rx66 and Rx102: £ 1.15