Circuit Design, Inc. has released their data transceiver LMD-400-R, designed for use under the European Land Mobile Service specification EN 300-113 and Private Land Mobile Services FCC Part 90 in the U.S. market. TheLMD-400-R data transceiver is the same size and pin-compatible with Circuit Design’s EN 300220 compliant license-exempt transceiver model STD-302N-R that has been widely used in Europe as a standard transceiver for remote control in industrial radio applications.
The LMD-400-R is a synthesized data transceiver with 10 mW RF power, 4800 bps data rate and GFSK modulation. It is designed for use in the license bands in Europe and the U.S.A. that require high receiver performance and narrow band transmission.
- Adjacent channel selectivity: Limit = ≥ 60 dB @ 12,5 kHz (Receiver)
- Intermodulation response rejection: Limit for mobile & portable equipment = ≥ 65 dB (Receiver)
- Blocking: Limit = ≥ 84 dB (Receiver)
- Spurious response rejection: Limit= ≥70dB (Receiver)
- Adjacent channel power: Limit = -60 dB or <-36 dBm (Transmitter)
Unlike typical low-cost wide band radios under Part 15, Part 90 licensed band radio must be narrow band radio with 6.5 kHz, 12.5 kHz or 25 kHz channel spacing. Frequency stability must be 2.5 ppm for the 12.5 kHz channel spacing system. This is a stringent requirement for a small-sized OEM SRD data transceiver module. The LMD-400-R fulfills these requirements for frequency stability in a 12.5 kHz channel spacing system.
Three frequency versions are available, in 438-442 MHz, 458-462 MHz (EN 300113 compliant model) and 458-462.5 MHz versions (FCC Part 90 certified model). A custom variant in the 400 MHz band, with 4 MHz switching range is available for volume orders.
The LMD-400-R data transceiver is intended for use in battery-powered portable applications. To reduce current consumption and limit mechanical size as far as possible, the RF output power ofLMD-400-R is set at 10 mW. To increase the operating range, it is possible to add an external power amplifier to the LMD-400. The clean 10 mW transmitter signal of the LMD-400-R can easily be amplified by 20 to 30 dB without exceeding the adjacent channel power limits.
Circuit Design, Inc.
7557-1 Hotaka, Azumino
Tel: +81 263-82-1024
Fax: +81 263-82-1016
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