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Summary of Contents for Microhard Systems n920BT
- Page 1 Operating Manual n920BT 900 MHz Spread Spectrum OEM Transceiver Revision 0.10 September 5, 2013 Microhard Systems Inc. #17, 2135 – 32 Ave N.E. Calgary, Alberta T3K 4Z4 Phone: (403) 248-0028 Fax: (403) 248-2762 www.microhardcorp.com...
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Page 2: Warranty
Warranty Microhard Systems Inc. warrants that each product will be free of defects in material and workmanship for a period of one (1) year for its products. The warranty commences on the date the product is shipped by Microhard Systems Inc. Microhard Systems Inc.’s sole liability and responsibility under this warranty is to repair or replace any product which is returned to it by the Buyer... -
Page 3: N920Bt Regulatory Requirements
WARNING: Changes or modifications not expressly approved by Microhard Systems Inc. could void the user’s authority to operate the equipment. This device has been tested with MMCX connectors with the antennas listed in Appendix A When integrated in OEM products, fixed antennas require installation preventing end-users from replacing them with non-approved antennas. -
Page 4: Table Of Contents
Contents Warranty ..................................ii Warranty Diclaims ................................ ii Indemnification ................................ii Proprietary Rights ................................. ii n920BT Regulatory Requirements ..........................iii CONTENTS ................................IV GENERAL ................................1 ................................ 1 RODUCT VERVIEW ..............................2 UTPUT OWER EVEL INSTALLATION ..............................4 ..................................4 VERVIEW ............................ -
Page 5: General
The small-size and superior RF performance of this module make it ideal for many applications. While a pair of N920BT modules can link two terminal devices (“point-to- point” operation); multiple modules can be used together to create a network of various topologies, including “point-to-multipoint” and “repeater”... -
Page 6: Output Power Level
While the typical application for the N920BT is to provide a short- to mid- range 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. - Page 7 The power setting must be no more than the above calculation value. higher is a violation of FCC rules. See IMPORTANT warning below: OEMs must take precaution to satisfy the maximum RF exposure and EIRP maximum limits in accordance with the compliance limits herein. The conducted power is continuously variable from 0.001 to 1.0 Watt.
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Page 8: Installation
3. Installation 3.0 Overview The N920BT 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 N920BT module. 3.1 Estimating the Gain Margin... - Page 9 Figure 1 Gain Calculation The power level has been set to 30dBm (1W) on the transmitter, and the receiver sensitivity for the N920BT is -108dBm. System gain would be calculated to be: 30 - 2 + 6 + 3 - 2 + 108 = 143 dB.
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Page 10: Antennas And Cabling
-95dBm. 3.2 Antennas and Cabling This section describes the recommended procedure for installing cabling and antennas for use with the N920BT module. 3.2.1 Internal Cabling The most common method for installing the module is to run a cable from the module’s MMCX connector to a reverse TNC bulkhead connector on... -
Page 11: Installing External Cables, Antennas And Lightning Arrestors
Typically, both ports on surge arrestors are N-female. External Filter Although the N920BT is capable of filtering out RF noise in most WARNING: environments, there are circumstances that require external filtering. Paging towers and cellular base stations in close proximity to the N920BT Direct human contact with the antenna can desensitize the receiver. - Page 12 See appendix A for a list of approved antennas that can be used with the N920BT radio modem. If you require another type of antenna WARNING: please contact Microhard Systems Inc. The N920BT CANNOT be used Be careful with dBi vs dBd gains with any antenna that does not appear in Appendix A.
- Page 13 36dBm with respect to the isotropic radiator. Example 1) What is the maximum power the N920BT can be set to comply with FCC and IC given the following equipment given a Rubber Ducky Ant Gain 2dBi and no cable or connectors in the system? Max EIRP 36dBm Max TX power = EIRP –...
- Page 14 6dBd, 900 MHz Omni Directional Antenna Bluewave, RPTNC Pigtail WARNING: Changes or modifications not expressly approved by Microhard Systems Inc. could void the user’s authority to operate the equipment. This device has been tested with MMCX connectors with the antennas listed in Appendix A When integrated in OEM products, fixed antennas require installation preventing end-users from replacing them with non- approved antennas.
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