2.4GHz receiver compatible with DSM2/DSMX including one integrated 3A reversible controller for brushed motors (ESC)
3-18v for 1-4S LiPo, 1-5 life, 3-12 NiMH, 1-2 PP3
Rx65 is intended for surface vehicles which require forward and reverse motor control. For brushed motors this is achieved with an H-Bridge. Motor outputs are abbreviated H1 and H2. These are often referred to as ESCs (Electronic Speed Controllers). They have 256 step resolution in both directions (512 total). They control speed with PWM which by default is set to its fastest (quietest) 12kHz setting.
Each H output can handle up to 3A current. This is measured with motor stalled. The main constraint with current is heat in the receiver. Higher currents may be possible if heat sinks are added or PWM frequency is reduced to 200Hz. Rx65 has one integrated ESC (H1). A daughter board can provide a second (H2) which can be used independently ('3A2' = 3A x2) or in parallel ('6A1' = 6A x1). How the outputs are used has to be set with programming (see below). Receivers are provided 'pre-programmed'. The default settings are shown on the instructions pages for each variant.
The simplest way to start is with a 'wired' version of the receiver (eg: Rx65-22 with Tx22-Built). Connect the red/back to a battery and two other wires to the motor, bind once and that's about it. If you use a 9v battery in the train you normally have to disable LVC. Make sure you read the instructions for your variant.
'Variants' are simply 'configurations'. Each variant is a different combination of settings to better match common needs. Although these are described as 'car/train/boat' any variant can be used for anything. All settings can be changed in a process called 'programming'. F1-F3 (A/B/C) are programmed as P9-P11.
More advanced info:
The receiver is built with 20v components and is rated for 3-18v operation.
'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 3.3v/0v in voltage terms). The action can be inverted so 'On' can mean 0v. P outputs are used to provide servo signals direct to the white/yellow lead on a servo. They can often directly control triggers on external sound cards. They are also used to drive LEDs but need a resistor to limit current to no more than 20mA.
'F' outputs are 'buffered' P outputs. The buffer is an N-channel FET. These provide a path to ground (0v) when on and are floating (disconnected) when off. If you are familiar with the term 'open collector' used with transistors, these are the same but with FETs they are called 'open drain'. Three F outputs exist on Rx65. They are labelled A, B and C. They are often used to control sound cards and lights.
The 'H' output is an H-Bridge. This is used to control the speed and direction of a brushed motor. This can also be referred to as an integrated ESC (Electronic Speed Controller). It has 256 step resolution in both directions (512 total). It controls speed with PWM which by default is set to its fastest (quietest) 16kHz setting. The H output can handle up to 3A current. This is measured with motor stalled. The main constraint with current is heat in the receiver. Higher currents may be possible if heat sinks are added or PWM frequency is reduced to 120Hz.
The receiver is built with 20v components and is rated for 3-18v operation. The version marked as being '9v' is made with the 18v specification but has a BEC installed. The BEC generates too much heat at high voltages so that version is recommended for use between 6-9v. It may be possible to use it above 9v but this depends on how much current the servo draws in regular use. A BEC is a Battery Eliminator Circuit used to power servos at 5v.
Settings for trains with separate controls for speed and direction (one control for throttle - centre off) and Selecta enabled (for use with Tx22).