RF Modem


:: Applications Area ::

Baby monitors

Gaming terminals

Multi handset cordless phones [900Mhz, 2.4Ghz]

:: Data sheet ::

Data communications terminals

Wireless hands free kits

Office based intercom

:: Application Notes ::


:: Introduction ::

RF Modem modules 433 900 MHz, embedded platform, RF Transceiver, technology, Wireless LAN , wireless infrastructure, platform selection, links, standards, wireless network, wireless networking, communication, application, protocol.

We are Specialized in the Design, Development and Manufacturing of wide range of Hand Held Terminals and Wireless Communication Products. For over 7 years we have developed Hand Held Terminals that are used successfully in various cross-functional applications like, Industrial, mobile, Wireless Data communications, process automation etc., and stands ahead of the competition in innovative race of integrating latest technologies. We also provides State-of-the-art solutions on customized OEM basis to the industry.

The Low Power Radio Modem is an ultra low-power transceiver, mainly  intended for 315, 433, 868 and 915 MHz frequency bands. It has been specifically designed to comply with the most stringent requirements of the Low Power short distance control and data communications applications.

An unique UHF RF Radio Modem

The UHF transceiver is designed for very low power consumption and low voltage operated energy meter reading applications. The product is unique with features like compact, low cost, versatile, short range, intelligent data communication etc., The product also has 2/3 isolated digital inputs and outputs. Necessary command sequences will be supplied to operate these tele commands from the user host. The Radio Modem is designed primarily for FSK systems in the ISM/SRD bands at 315, 433, 868 and 915 MHz, but bands can easily be programmed for operation at other frequencies between 300 MHz and 1000 Mhz. The modem supports max. data-rates up to 19.2 kbit/s.


  • Programmable frequency (300-1000 MHz)
  • Low operating voltage (3.3 V) 10 dBm)
  • Compact & Light Weight
  • Incoming signal status indication
  • Active pack current less then 75mA
  • High receiver sensitivity (-110dBm)
  • Programmable output power, ranging from -20 to +10 dBm
  • Suitable for frequency hopping protocols
  • User programmable

          -        Data Rate

          -        Centre Frequency

          -        Channel Frequency (Max. 20 Channels) 

Technical Specifications:

Related to Transmission
Transmit Data Rate   600 to 19,200 Baud
Modulation      Binary FSK

Output Power (Programmable)                                 433 MHz 

-20 to 10 dBm                                     

                                 868 MHz

-20 to   5 dBm

Related to Reception

Receiver sensitivity 433 MHz -109 dBm -105 dBm
Output signal phase noIse -85 dBc/Hz At 100 KHz offset from carrier

 100 meters plus (open range) with 0 dBi,

 Omni Directional Antenna

Frequency / Channel Options
Spread Spectrum Feature rates of 1 to 100 (max.) depending on bit rate and amount of data to be sent during each transmission.
Channel Selection About 20 channels can be selected through software programmability.
Interface/ connectors  
Data  RS-232, through 9 pin D-type connector
Antenna SMA Connector
Power 2Pin, circular jack
Supply Voltage                             Supply Current 3.3 v Typ. (3 to 3.6 v )                                                                          
Transmit Mode (10dBm) 60mA (Max)
Receive Mode 40mA (Max)
Digital Outputs 2/3 No. Of isolated realy contacts
Digital Inputs  2/3 No. Of opto isolated inputs
Pakeging   Board only or compact metal enclosure

 LPR is ideal for battery powered or low powered applications.
The RF Radio Modem operates at 3.3 V, consuming average current of about 50 mA making it ideal for Battery powered Applications or with integrated meter applications, as the PT burden will be less than 200 mW.

Description of a typical application :
Automatic Meter Reading with Common Meter Reading Instrument (CMRI).

A set of Low Power Radio Modems connected to Tri-Vector Energy Meters and CMRI with a spacing of about 100 meters (i.e, any meter to CMRI)The software to link the two product ends is a transparent wireless data link.

Once the command from CMRI is given to the meter to initiate the transmission and the data sent by the meter is
received by the radio unit on the CMRI side continuously. The responded radio on the CMRI gets ready to accept the
data from the meter till the end of packet is detected, consequently, the meter side LPR enters into receive mode to
detect the command provided by the CMRI for the packet and the procedure goes on till the end of data transfer from
meter to CMRI (wireless data link).
All these operations can be performed without any manual intervention.

The field person can collect the meter data from a distance of 100 meters (open range) instead of going to the exact meter location. The RF data rate between two sets can be 9600kbps (optionally upto 19,200).

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UHF Reader writer

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UHF RFID Reader Antenna 



Low Cost Desktop Time attendance System


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