Timpdon Electronics GRX4 User Notes

Timpdon Electronics Tel: [phone] Issue 1 — November 2016

www.timpdon.co.uk Page 12 of 12

User Notes

Timpdon Electronics Tel: [phone] Issue 1 — November 2016
www.timpdon.co.uk Page 1 of 12

GigaRad Radio System

Point Controller

Model GRX4

Timpdon
Electronics

This advanced 2.4 GHz GigaRad Radio
Receiver/Controller is designed to be used
with any model of GigaRad transmitter.

It is designed for the radio control of a single
point using a standard RC servo as the point
motor.

The controller may be user programmed,
in-situ for:

•

Point activation by any one of the four
transmitter Auxiliary switches Aux 1 to
Aux 4.

•

Point set and reset servo positions.

The servo rotation rate is pre-programmed to
give realistic slow speed point operation.

It complies fully with all UK legislation for
licence free operation.

Specification

Frequency 2.4 GHz Radio Control Model Band

RF Sensitivity -94 dBm

Modulation Gaussian Frequency Shift Keying

Range Up to 100 metres with any GigaRad

transmitter, in a normal model railway or
garden environment

Size 47 mm [over pins] x 35 mm x 11 mm

Power Supply 4.8 V to 6V d.c. battery supply

Timpdon Electronics Tel: [phone] Issue 1 — November 2016
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Introduction

The GRX4 comprises a 2.4 GHz Gigarad radio receiver and point
controller within a single package.

The receiver will operate with any GigaRad transmitter and, during
setup is bound to a particular transmitter, such that it will respond only
to transmissions from that transmitter. It may be re-bound by the user
to another transmitter at any time.

The output from the GRX4 is a standard servo control PWM signal, with
two user programmable stable positions [Set and Reset] and a
controlled rotation rate between these two positions.

The activation of the servo output can be user programmed to respond
to the operation of any one of the four available Auxiliary output
switches on any GigaRad transmitter.

Principles of Operation

The GRX4 is designed to use any standard RC servo as a point motor,
with movement of the point blades controlled directly by the servo arm,
rotating over a small angle between two fixed positions, set and reset.

Point setting is controlled by any one of the four transmitter auxiliary

switches, with the reset position corresponding to switch off and the
set position to switch on.

Both the set and reset positions of the servo are user programmable
from the transmitter, operating in a special calibration mode.

Point Servo

Mechanical Linkage

Stress Relief
[See Text]

Timpdon Electronics Tel: [phone] Issue 1 — November 2016
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User Notes