Circuit Design, Inc, Japan, has released a Low Power Radio Transceiver module, a version of the highly successful STD-302N-R-335 MHz for industrial use, for the Indian market. The version for Indian frequencies (335.7125, 335.7375, 335.7625, 335.7875, 335.8125 and 335.8375 MHz) supports industrial equipment manufacturers seeking to enter the Indian market for industrial remote control systems for crane operation. Other frequencies are also available.

Specifications: RF output power - 1 mW; bandwidth - <10 kHz; and TX/RX switching time -15-20 ms.

Features:

1. Superior interference rejection and high receiver sensitivity - after the antenna input, a matching circuit which also works as an ESD protection circuit is followed by a SAW filter*. There is a gain of 18.7 dB in the process from high frequency amplifying to IF frequency generation performed by the SAW filter, LNA and down-converter.
2. Stable operation with narrowband FM - it is generally known that wideband FM is defined as the state in which the modulation index is more than 1, and for narrowband FM, 1 or less than 1. For STD-302, the maximum frequency deviation is 4.8 kHz and the bit rate is 9600 bps (maximum modulation frequency 4.8 kHz), which determines the modulation index as 1. For stable operation with narrow band FM, the provision of a binarisation circuit, and temperature drift characteristics are important factors. Circuit Design, Inc, has spent a lot of time on research and tests and has also maintained close contacts with crystal manufacturers in pursuit of the best specification, resulting in the achievement of a binary FSK narrowband radio module that can operate in a temperature range from -20?C to + 60?C
3. High TX/RX switching speed required for use in feedback (semi-duplex) systems - the company has succeeded in accelerating the TX/RX switching time up to 5 ms using one VCO and the MIX method.
4. Compact package with high shock and noise resistance - the GND of STD-302 is strengthened using a 4-layered PCB (full internal-layer GND). The VCO and PLL circuits, which are sensitive to noise, vibration and voltage change, are protected in a special shield casing. In addition, the whole PCB is covered from both front and back with a robust casing to provide resistance against noise and vibration caused by PCB bending.
5. Future-proof design for reliable long-term supply - Circuit Design, Inc, emphasises design using discrete, interchangeable parts to ensure a long-term supply of these product.

Applications: Industrial remote control systems; EOT cranes manufacturers for remote controls for cranes; and the control systems for factory automation machines.

(This product was designed to meet the specification above; users are required to verify that their final product meets the appropriate specifications and to perform the procedures for regulatory compliance) Authorised distributor for Indian market: Adiv Techno Services Inc, No: 3/79A, "Annapurna" Building, Mahatma Basaveshwar Nagar (Koppa Tank), Dharwad, Karnataka 580 008. Mobile: 098456-23546, 098929-21656. Email: info@adivtechnoservices.com