27MHz remote control
This is a niche product intended for radio control (RC) of the somewhat larger model submarines, which are equipped with a device to control buoyancy, which must be able to navigate deep underwater (3 metres or more) and have switching functions (on/off) in addition to servos.
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It consists of a receiver and a transmitter PCB. Hard- and software are derivatives of the research PCB (see elsewhere on this website). Various ballast systems are supported, including piston tanks.
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From October 2024, a prototype system, based on the AX5043 transceiver, is being tested by David Forrest (UK). When ice turns back into water, Timothy Senecal (US) will test a similar system. The video shows my 30-year-old overhauled model submarine equipped with the 27MHz remote control system.​
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In the image of the receiver below, the AX5043 has been replaced by Radiometrix's LMR0 module. This allows me to use the AX5043 transceivers I have for applications other than simplex remote control. In terms of functionality and dimensions, there is no difference between a receiver with the AX5043 or the LMR0 module.
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A null series of 10 sets based on Radiometrix modules has recently been delivered and successfully tested.
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Upon request a product manual is available here (please specify your ballast system).
Receiver
The receiver provides 7 digital outputs (ULN2003) and 7 proportional pulse outputs (servo control signals).
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The receiver is actually more like a controller. All kinds of signals are connected to it, pass through it or are processed by it. It is like a spider in a web. Several built-in autonomous safeguards help to keep the vessel within safe operating conditions.
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Production data for a small DIY antenna impedance matching PCB is available for download. The antenna is a shortened wire dipole antenna. It is intended for mounting inside/against the plastic hull material of the WTC.
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By default, the receiver PCB supports piston tanks. However, when programmed with different software, the receiver PCB can also support some ballast systems based on pumps and valves (see overview ballast systems, yellow ​section).
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A (rechargeable) battery of 6 to 12VDC can be used as supply voltage (VS).
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The image below shows the receiver PCB installed in a model submarine equipped with piston tanks.
57x100mm
Transmitter
The transmitter provides 7 digital and 7 analogue inputs. The digital inputs are on/off signals and the analogue inputs servo control signals.
Supports the Radiometrix LMT0 transmitter module (on the back of the PCB).
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Production data for a small DIY antenna impedance matching PCB is available for download. The antenna is a shortened telescopic antenna.
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Amongst others the transmitter provides a PPM input for utilizing the joysticks of an off-the-shelf RC transmitter. This function requires a PPM output on the off-the-shelf RC transmitter (trainer port).
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The supply voltage is 15VDC regulated.​
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The image below shows the transmitter PCB mounted on the outside of an old Robbe/Futaba F-14 remote control.
75x95mm
