User's Manual

90478 2.4GHZ FH4T RADIO SYSTEM USER'S GUIDE

TELEMETRY CONNECTIONS AND MOUNTING

REFERENCE

1) Mount the RPM Sensor to an aluminum or ABS angled bracket, then mount the bracket to your model, making sure that it's

held securely in place.

Mounting the RPM Sensor:

The RPM Sensor uses infrared technology to record RPM data from a rotating part, such as a flywheel or a spur gear. One Black

and one White reflective decal is included that is attached to the rotating part so the Sensor Pickup can 'see' it.

Sensor Pickup

Input Plug

Reflective Decal

Angled Bracket

RPM Sensor

Sensor Pickup

Spur Gear or Other Rotating Part

~1mm

Sensor Pickup

Mounting the Temperature Sensor:

1) Secure the Sensor End directly against the part of your engine, motor, battery or other object you want to monitor temperature

readings from, using either a nylon cable tie or high-temperature clear tape. For example, to monitor the cylinder head

temperature of your glow- powered model, the best place to secure the Sensor End is where the bottom of the cylinder head

meets the top of the engine case. The Sensor End can be held in place using a nylon cable tie wrapped around your engine.

To monitor the temperature of your battery pack or electric motor, high-temperature clear tape can be used to secure the

Sensor End to the exact spot you want to monitor.

Sensor EndInput Plug

Attach with

High-Temperature Clear Tape

2) Cut one of the two reflective decals included with the RPM Sensor into an ~2mm diameter and apply it to the rotating part,

so that as the part rotates, the reflective decal passes in Front of the Sensor Pickup. If the rotating part is metallic-colored

(silver, aluminum, chrome, etc.), use the Black reflective decal and if the rotating part is dark-colored (black, blue or another

dark color), use the White reflective decal.

IMPORTANT: For optimal operation, the Sensor Pickup should be positioned approximately 1mm away from the rotating

part (flywheel, spur gear, pinion gear etc.)

After installing the RPM Sensor and connecting it to your receiver, the RPM Sensor must be calibrated. For more information,

see the RPM and Speed Telemetry Display Options section on pages 63 through 68.

IMPORTANT: When installed, it's important that the Sensor Pickup face the rotating part and that the Black or White reflective

decal is positioned so that it passes in Front of the Sensor Pickup. It's also important that the reflective decal contrasts with

the rotating part it's applied to and that the Sensor Pickup is mounted approximately 1mm away from the rotating part.

IMPORTANT: If the Sensor Wires are not long enough for your specific application, you can carefully splice in extra wire of

similar gauge to extend the Sensor Wires to the desired length. Make sure to solder the splices securely together and protect

the splices using heat-shrink tubing.

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