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Deltang Rx66 DSM2/DSMX Receiver for Land-Based Vehicles
Please take a look at this notice on Rx66 availability.
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 3V-13V in standard form or 8.5V-18v with add-on regulator. This allows the use of 1-4S LiPo, 1-5 LiFe, 3-12 NiCd/NiMH or 1 PP3.
Rx66 is available as board-only for you to add wiring or with a range of pre-wired leads / connectors. - see the Wiring Options tab for details. 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 (Deltang website) 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 basic form of the the Deltang receivers is a bare board with solder pads for you to add your own wiring. As not all modellers are able to attach wires to the tiny circuit board pads, several wiring options are available to simplify the installation. Please contact us to discuss your needs if one of the options, described below, is not ideal.
If you select one of the wiring options, and that is all you need for connecting the receiver into your vehicle, you should also select the heat shrink tube to be applied to the receiver. Otherwise, a length of heat shrink tube is provided for you to apply yourself.
There have been several reported issues when using Rx66 above 14V and with a noisy motor - e.g. due to worn brushes or commutator. The electrical noise finds its way into the Rx66 regulator circuit and causes the device to operate outside its safe area. This regulator supplies the receiver microprocessor and radio transceiver with 3.3V.
The usual result is a dead regulator which is seen as no activity on the receiver LED. Suppressing the motor with 100nF capacitors and 10uF chokes in series with each motor lead does help but we cannot guarantee the Rx66 when used above 13V in standard form.
Deltang are working on a solution to the problem but there is currently no ETA for a fix.
Micron has developed an add-on regulator which addresses the problem. This is a small board mounted on the bottom of the Rx66 (see photo). The original regulator chip is removed and the new regulator supplies the receiver. When fitted with this option, we guarantee Rx66 operation up to 18V. If you wish to use Rx66 above 13V, please select 'upgraded' from the Receiver Regulator menu below.
Please contact Micron if you want additional information on the issue.
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.
The heatsink is attached to the Rx66 with a non-metalic screw through the hole in the center of the group of ESC devices. If using the heatshrink cover, this must be fitted and a rectangular hole cut into it above the ESC devices before the heatsink is attached - see More Images.
Receiver Variation, Antenna and Wiring Options:
The standard onboard 3.3V regulator is guaranteed for up to 13V operation. A Micron developed upgrade supports reliable operation at 18V. See the Rx Regulator tab for details.
throttle control method applies only to -2 and -22 variants
Other wiring options are available, contact Micron to discuss your requirements.
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 and Rx66: £ 1.15
not fit the standard wire aerial version of the receiver as this does not have the required socket; only the remote aerial version of the receiver has the socket.