Description

FCC ID: CWU-NXR-MO

Operational Description

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FCCID_787618

NXR-MO Theory of Operation The NXR-MO is a wireless module that uses a radio chipset based on the Eber EM250 Zigbee radio transceiver chip. The antenna is integral to the device (etched on the PWB). The EM250 chip uses an on-chip 4.8 GHz VCO. A 24 MHz crystal oscillator is used to establish the PLL reference signal. The radio transmitter utilizes an efficient architecture in which the data stream directly modulates the VCO. An integrated PA boosts the output power. The calibration of the TX path as well as the output power is controlled by the digital logic. The radio receiver is a low-IF, super-heterodyne receiver. It utilizes differential signal paths to minimize noise interference, and its architecture has been chosen to optimize co-existence with other devices within the 2.4 GHz band (namely, IEEE 802.11g and Bluetooth). After amplification and mixing, the signal is filtered and combined prior to being sampled by an ADC. Data transmission rate is 250 kbps. Channels are numbered 11 – 26 and are centered on the frequencies below. Channel Center Frequency (MHz) 11 2405 12 2410 13 2415 14 2420 15 2425 16 2430 17 2435 18 2440 19 2445 20 2450 21 2455 22 2460 23 2465 24 2470 25 2475 26 2480 Channel bandwidth is 2 MHz. Occupied bandwidth is 1.6 MHz.

The recommended operating range is -40 to +85 degrees Celsius. Over this frequency range the frequency stability is rated at +/- 40 ppm which would be a maximum drift of 99.2 kHz. Modulation is O-QPSK (Offset Quadrature Phase Shift Key) and the rf carrier is spread using Direct Sequence spreading. RF power output is +4 dBm. The nominal gain of the integral antenna is 0 dBi. The NXR-MO is designed as a stand-alone module and is intended to be used by AMX in their line of remote control devices.


Document Created: 2007-04-09 16:31:21
Document Modified: 2007-04-09 16:31:21
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