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MHX-920 Operating Manual: Contents

 

iii

 

MHX920 Regulatory Requirements 
 
PLEASE READ THIS SECTION CAREFULLY 

 

 WARNING

:   

To satisfy FCC RF exposure requirements for mobile transmitting devices, a separation distance of 23 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

:   

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 MCX and Reverse Polarity SMA 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). 
 

 WARNING

MAXIMUM EIRP 
FCC Regulations allow up to 36 dBm equivalent isotropically radiated power (EIRP).  Therefore, the sum 
of the transmitted power (in dBm), the cabling loss and the antenna gain cannot exceed 36 dBm.   
 

 WARNING

EQUIPMENT LABELING 
The FCC and IC numbers depend on the model of the radio module. Do NOT use the Marketing 
Name of the product but the Model to distinguish the Certifications Numbers.  This device has 
been modularly approved.  The manufacturer, product name, and FCC and Industry Canada 
identifiers of this product must appear on the outside label of the end-user equipment. 

 
 

SAMPLE LABEL REQUIREMENT for Model: MHX920A: 

 

 
 

 
 

 
 
 
 
 

Contains:    

FCCID: NS905P20     IC : 3143A-05P20 

This device complies with Part 15 of the FCC Rules.  
Operation is subject to the following two conditions: 
(1) this device may not cause harmful interference, 
and (2) this device must accept any interference 
received including interference that may cause 
undesired operation. 

Summary of Contents for MHX-920

Page 1: ...MHX920 900 MHz Spread Spectrum OEM Transceiver Revision 0 10 January 9 2006 17 2135 32nd Ave N E Calgary Alberta T3K 4Z4 Phone 403 248 0028 Fax 403 248 2762 www microhardcorp com Model MHX920A Microh...

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

Page 3: ...d 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 WARNING MAXIMUM EIRP FCC Regulations allow up to 36...

Page 4: ...ights ii MHX920 Regulatory Requirements iii CONTENTS IV 2 GENERAL 1 2 0 PRODUCT OVERVIEW 1 2 1 OUTPUT POWER LEVEL 2 3 INSTALLATION 4 3 0 OVERVIEW 4 3 1 ESTIMATING THE GAIN MARGIN 4 3 2 ANTENNAS AND CA...

Page 5: ...exempt band of the radio 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 allo...

Page 6: ...ry low power levels so it is recommended that the lowest power necessary is used using excessive power contributes to unnecessary RF pollution Ideally you should test the communications performance be...

Page 7: ...MHX 920 Operating Manual Chapter2 General 3...

Page 8: ...ween a transmitter receiver pair The number can be calculated based on knowledge of the equipment being deployed The following four factors make up a system gain calculation 1 Transmitter power user s...

Page 9: ...een system 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 co...

Page 10: ...2 Antennas and Cabling This section describes the recommended procedure for installing cabling and antennas for use with the MHX920 module 3 2 1 Internal Cabling The most common method for installing...

Page 11: ...and any person when the device is in operation Surge Arrestors The most effective protection against lightning is to install two lightning surge arrestors one at the antenna the other one at the inte...

Page 12: ...t If the equipment is in a fixed location and is to communicate with only one other unit also in a fixed location then a Yagi antenna is suitable Choose a Yagi with enough gain to ensure adequate gain...

Page 13: ...he maximum power setting of 30dBm Example 2 What is the maximum power the MHX920 can be set to comply with FCC and IC given the following equipment given a Yagi Ant Gain 12dBd and cable and connector...

Page 14: ...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...

Page 15: ...MHX 920 Operating Manual Glossary 11...

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