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n920 Operating Manual

 

9

 

A.  Approved Antennas 

Group Part 

Number 

Description 

Quarter Wave 

  

  

 

MHS031010 

<1.5dBi, 900MHz 1/4 Wave Antenna Reverse SMA Right Angle 

 

MHS031020 

<1.5dBi, 900MHz 1/4 Wave Antenna Reverse SMA Straight 

 

MHS031030 

<1.5dBi, 900MHz 1/4 Wave Antenna Reverse SMA Right Angle MHS 

 

MHS031040 

<1.5dBi, 900MHz 1/4 Wave Antenna Reverse SMA Straight MHS 

 

MHS031050 

<1.5dBi, 900MHz 1/4 Wave Antenna MCX Right Angle MHS 

 

MHS031060 

<1.5dBi, 900MHz 1/4 Wave Antenna Reverse SMA Straight 

Rubber Ducky 

  

  

 

MHS031000 

2dBi, 900MHz Rubber Ducky Antenna RPTNC Swivel 

 

MHS031070 

2dBi, 900MHz Rubber Ducky Antenna Reverse SMA Swivel 

 

MHS031080 

2dBi, 900MHz Rubber Ducky Antenna Reverse SMA Straight 

Transit Antennas 

  

  

 

MHS031210  

3dBd, 900 MHz Transit Antenna with Ground Plane  

 

MHS031220 

3dBd, 900MHz Transit Antenna No Ground Plane  

 

MHS031230 

3dBd, 900MHz Transit Antenna Permanent Mount GP  

 

MHS031240  

3dBd, 900MHz Transit Antenna Permanent Mount NGP  

 

 

Mounts for Transit Antennas have a RPTNC Pigtail 

Yagi Antennas 

  

  

 

MHS031311 

6dBd, 900MHz Yagi Directional Antenna Antenex, RPTNC Pigtail 

 

MHS031431 

6.5dBd, 900MHz Yagi Directional Antenna Bluewave, RPTNC Pigtail 

 

MHS031501 

9dBd, 900MHz Yagi Directional Antenna Antenex, RPTNC Pigtail 

 

MHS031441 

10dBd, 900 MHz Yagi Directional Antenna Bluewave, RPTNC Pigtail 

 

MHS031451 

11dBd, 900 MHz Yagi Directional Antenna Bluewave, RPTNC Pigtail 

 

MHS031401 

12dBd, 900MHz Yagi Directional Antenna Antenex, RPTNC Pigtail 

 

MHS031411 

12dBd, 900MHz Yagi Directional Antenna Bluewave, RPTNC Pigtail 

Patch Antennas 

 

 

 

MHS031440 

8dBi 900 MHz Patch Antenna, RPTNC Pigtail 

 

MHS031430 

12.5dBi 900 MHz Patch Antenna, RPTNC Pigtail 

Omni Directional 

  

  

 MHS031251 3dBd, 

900MHz 

Omni 

Directional Antenna Antenex, RPTNC Pigtail 

 

MHS031461 

3dBd, 900 MHz Omni Directional Antenna Bluewave, RPTNC Pigtail 

 MHS031321 6dBd, 

900MHz 

Omni 

Directional Antenna Antenex, RPTNC Pigtail 

 

MHS031471 

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. Antennas not listed in the tables must be tested to comply with FCC Section 15.203 (unique 
antenna connectors) and Section 15.247 (emissions).  Please Contact Microhard Systems Inc. if you need more 
information. 
 
Industry Canada: This device has been designed to operate with the antennas listed below, and having a maximum gain 
of 14.2 dBi. Antennas not included in this list or having a gain greater than 14.2 dBi are strictly prohibited for use with 
this device. The required antenna impedance is 50 ohms.  To reduce potential radio interference to other users, the 
antenna type and its gain should be so chosen that the equivalent isotropically radiated power (EIRP) is not more than 
that required for successful communication.  This Class B digital apparatus complies with Canadian ICES-003.

 

 

Summary of Contents for n920

Page 1: ...ng Manual n920 900 MHz Spread Spectrum OEM Transceiver Revision 0 10 April 16 2008 17 2135 32nd Ave N E Calgary Alberta T3K 4Z4 Phone 403 248 0028 Fax 403 248 2762 www microhardcorp com Microhard Syst...

Page 2: ...ONAL WARRANTY Indemnification The Purchaser shall indemnify Microhard Systems Inc and its respective directors officers employees successors and assigns including any subsidiaries related corporations...

Page 3: ...s fixed antennas require installation preventing end users from replacing them with non approved antennas Antennas not listed in the tables must be tested to comply with FCC Section 15 203 unique ante...

Page 4: ...ights ii n920 Regulatory Requirements iii CONTENTS IV 2 GENERAL 1 2 0 PRODUCT OVERVIEW 1 2 1 OUTPUT POWER LEVEL 2 3 INSTALLATION 3 3 0 OVERVIEW 3 3 1 ESTIMATING THE GAIN MARGIN 3 3 2 ANTENNAS AND CABL...

Page 5: ...dio spectrum1 this means that it can be used without access fees such as those incurred by cellular airtime a serial I O data port with handshaking and hardware flow control allowing the N920 to inter...

Page 6: ...ommended that the lowest power necessary is used using excessive power contributes to unnecessary RF pollution Ideally you should test the communications performance between units starting from a low...

Page 7: ...nowledge of the equipment being deployed The following four factors make up a system gain calculation 1 Transmitter power user selectable 2 Transmitter gain transmitting antenna gain minus cabling los...

Page 8: ...tem gain and path loss Referring to the same example suppose the path loss is 100 dB the gain margin would be 40 dB which is more than adequate for reliable communication Path loss is a very complicat...

Page 9: ...cedure for installing cabling and antennas for use with the N920 module 3 2 1 Internal Cabling The most common method for installing the module is to run a cable from the module s MCX connector to a r...

Page 10: ...most effective protection against lightning is to install two lightning surge arrestors one at the antenna the other one at the interface with the equipment The surge arrestor grounding system should...

Page 11: ...suitable Choose a Yagi with enough gain to ensure adequate gain margin When deploying the Yagi point the antenna towards the intended target ensuring the antenna elements are perpendicular to the grou...

Page 12: ...the maximum power setting of 30dBm Example 2 What is the maximum power the N920 can be set to comply with FCC and IC given the following equipment given a Yagi Ant Gain 12dBd and cable and connector l...

Page 13: ...d 900MHz Yagi Directional Antenna Bluewave RPTNC Pigtail Patch Antennas MHS031440 8dBi 900 MHz Patch Antenna RPTNC Pigtail MHS031430 12 5dBi 900 MHz Patch Antenna RPTNC Pigtail Omni Directional MHS031...

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