Operating Manual n920X2 900 MHz Spread Spectrum OEM Transceiver Revision 0.30, January 22, 2019 www.microhardcorp.
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n920X2 Regulatory Requirements PLEASE READ THIS SECTION CAREFULLY WARNING: To satisfy FCC RF exposure requirements for mobile transmitting devices, a separation distance of 35 cm or more should be maintained between the antenna of this device and persons during device operation. To ensure compliance, operations at closer than this distance is not recommended. The antenna used for this transmitter must not be co-located in conjunction with any other antenna or transmitter.
Co-Location with Cellular Modems FCC: The maximum calculated MPE ratio for the EUT with 3 dBi dipole antenna is 0.216 (evaluated at 35 cm), this configuration can be co-located with other antennas provided the sum of the MPE ratios for all the other simultaneous transmitting antennas incorporated in a host device is < 1.0 - 0.216 < 0.784. The following co-location were evaluated for mobile configurations: Industry Canada: The maximum calculated MPE ratio for the EUT with 3 dBi dipole antenna is 0.
Contents Indemnification.................................................................................................................................................................... ii Proprietary Rights ................................................................................................................................................. ii n920X2 Regulatory Requirements .......................................................................................................................
2. General 2.0 Product Overview The n920X2 is a high-performance embedded wireless data transceiver. Operating in the 902 - 928 MHz ISM band, this frequency-hopping spreadspectrum module is capable of providing reliable wireless data transfer between almost any type of equipment which uses an asynchronous serial interface. The small-size and superior RF performance of this module make it ideal for many applications.
◼ TDMA (time division multiple access) support, allowing multi-slave access in point-to-point mode. ◼ roaming ability, allowing repeaters and slaves to resynchronize with a new master if the synchronization pulse from the original master is lost. While the typical application for the n920X2 is to provide a short- to midrange wireless communications link between DTEs, it can be adapted to almost any situation where an asynchronous serial interface is used and data intercommunication is required. 2.
3. Installation 3.0 Overview The n920X2 complies with FCC part 15 at the modular level for operation in the license-free 902-928 MHz ISM band. This chapter provides guidelines for installing and deploying equipment which incorporates the n920X2 module. 3.
Figure 1 Gain Calculation The power level has been set to 30dBm (1W) on the transmitter, and the receiver sensitivity for the n920X2 is -108dBm. System gain would be calculated to be: 30 - 2 + 6 + 3 - 2 + 108 = 143 dB.
Once the equipment is deployed, you can verify the signal strength by entering into Command Mode and reading Register S123. This register provides the average signal strength in dBm. The minimum strength for communication is roughly -108dBm. For consistent reliable communication, you should try to deploy the equipment such that signal strength exceeds -95dBm. 3.2 Antennas and Cabling This section describes the recommended procedure for installing cabling and antennas for use with the n920X2 module. 3.2.
3.2.2 WARNING: To satisfy FCC RF exposure requirements for mobile transmitting devices, a separation distance of 35 cm or more should be maintained between the antenna of this device and persons during device operation. To ensure compliance, operations at closer than this distance is not recommended. The antenna used for this transmitter must not be co-located in conjunction with any other antenna or transmitter.
WARNING: MAXIMUM EIRP FCC and IC Regulations allow up to 36dBm effective isotropically radiated power (EIRP). Therefore, the sum of the transmitted power (in dBm), the cabling loss and the antenna gain cannot exceed 36 dBm with respect to the isotropic radiator. WARNING: The n920X2 can only be used with any antennas listed in Appendix A. WARNING: Be careful with dBi vs dBd gains on antenna specifications. Antenna manufactures may not clearly indicate the gain on the antenna if it is dBd or dBi.
Examples: FCC and Industry Canada Regulations allow up to 36dBm effective isotropically radiated power (EIRP). Therefore, the sum of the transmitted power (in dBm), the cabling loss and the antenna gain cannot exceed 36dBm with respect to the isotropic radiator.
A. Approved Antennas This radio transmitter [IC: 3143A-N920X2] has been approved by Innovation, Science and Economic Development Canada to operate with the antenna types listed below, with the maximum permissible gain indicated. Antenna types not included in this list that have a gain greater than the maximum gain indicated for any type listed are strictly prohibited for use with this device.
