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VHF/UHF RADIO REMOTE TERMINAL UNIT

One of the conventional Configuration by Using VHF/UHF Network

SCADATRON Remote Terminal Unit (RTU) is flexible in the method by which it used to communicated with the Central Monitoring Station. As shown on the diagram above, SCADATRON RTU can be fitted in many communication network such as: VHF/UHF Radio network, GSM Cellular network (with or without SMS), Satellite Communication (INMARSAT-C or ORBCOMM Low orbiting Satellite), PSTN MODEM Dial-up Link, Leased-Line MODEM connection or Direct RS232 connection, etc.

One-to-One Telemetry System Topology

This is the simplest telemetry configuration where the input at the slave device (RTU) is transferred to the output of a master device (MTU)

Input	Output
FLOAT SWITCH (DIGITA INPUT)	PUMP CONTROL (DIGITAL OUTPU)
RESERVOIR LEVEL (ANALOG INPUT)	METER (ANALOG OUTPUT)

One-to-N Telemetry System Topology

Master With MMI PC and VHDF Radio Sub-Master Station

Radio System Topology

Configuration 1
1+1 Pump Control system

Configuration 2
1+n Reservoir Monitoring System

Configuration 3
1+1+n Reservoir Monitoring System With SAF Repeater and Sub-master Station

Configuration 4
1+n Reservoie Monitoring & Pump House control Scada System

Summary Radio Spectrum

Range (MHz)	Name
0.03-0.3	Low frequency (LF)
0.3-3.0	Medium frequency (MF)
3-30	High frequency (HF)
30-300	Very high frequency (VHF)
300-3000	Ultra high frequency (UHF)
3000-30,000	Super high frequency (SHF) (microwave)
30,000-300,000	Extremely high frequency (EHF) (millimeterwave)

Two Way Conventional Radio

Telemetry Using Conventional Mobile Radio


ST2000 Onboard Modem	ST10 External FSK Modem

Fact:

Conventional radio is cheap
Easily available
Service / support is good
Other radio model can be used
High radio power, 25w
Large coverage area/ distance
Power consumption high
Speed is low (1200bps, 2400 bps)
With voice/data changeover
No per call cost except pay radio license fees