Microhard Systems 04P11 MHX910 A 900MHz SPREAD SPECTRUM OEM MODULE User Manual MHX910AmanualREV0 10 FCC
Microhard Systems Inc MHX910 A 900MHz SPREAD SPECTRUM OEM MODULE MHX910AmanualREV0 10 FCC
USERS MANUAL
MHX 910A Operating Manual i
Operating Manual
MHX-910A
900 MHz Spread Spectrum OEM Module
Revision 0.10, November 1, 2004
#17, 2135 - 32nd Ave. N.E.
Calgary, Alberta T2E 6Z3
Phone: (403) 248-0028
Fax: (403) 248-2762
www.microhardcorp.com
Microhard Systems Inc.
ii MHX 910A Operating Manual
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caused by negligence, misuse or mistreatment of a product or for any unit which has been altered or modified in any way. The
warranty of replacement shall terminate with the warranty of the product.
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MHX 910A Operating Manual iii
Regulatory Requirements
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
This device can only be used with Antennas listed in Appendix A. Please Contact Microhard Systems Inc. if
you need more information or would like to order an antenna.
WARNING
MAXIMUM ERP
FCC Regulations allow up to 36 dBm effective radiated power (ERP). Therefore, the sum of the
transmitted power (in dBm), the cabling loss and the antenna gain cannot exceed 36 dBm.
WARNING
EQUIPMENT LABELING
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:
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.
FCCID: NS904P11
IC: 3143A-04P11
MHX 910A Operating Manual: Contents iii
Contents
CONTENTS .............................................................................................................................................................. III
HISTORY....................................................................................................................................................................V
TABLES AND FIGURES .......................................................................................................................................VII
TABLES .......................................................................................................................................................................................VII
FIGURES ......................................................................................................................................................................................VII
1. INTRODUCTION ...............................................................................................................................................1
1.0 PRODUCT OVERVIEW........................................................................................................................................................ 1
1.1 FEATURES ........................................................................................................................................................................ 2
2. CONFIGURATION ............................................................................................................................................4
2.0 OVERVIEW ....................................................................................................................................................................... 4
2.1 OUTPUT POWER LEVEL..................................................................................................................................................... 4
3. INSTALLATION.................................................................................................................................................7
3.0 OVERVIEW ....................................................................................................................................................................... 7
3.1 ESTIMATING THE GAIN MARGIN ....................................................................................................................................... 7
3.2 INTERNAL CABLING.......................................................................................................................................................... 9
3.3 INSTALLING EXTERNAL CABLES, ANTENNAS AND LIGHTNING ARRESTORS...................................................................... 10
A. APPROVED ANTENNAS ............................................................................................................................15
MHX 910A Operating Manual: History v
History
Revision Date Action FW Rev. Note
0.10 2004-11-01 Created For FCC Approval
MHX 910A Operating Manual: Tables and Figures vii
Tables and Figures
Tables
Table 1 Path Loss ..........................................................................................................................................................8
Table 2 Cable Loss ......................................................................................................................................................10
Figures
Figure 1 Gain Calculation.............................................................................................................................................7
Figure 2 System Deploying ...........................................................................................................................................8
Figure 3 Suggested Internal Cabling .............................................................................................................................9
MHX 910A Operating Manual: Chapter 1 Introduction 1
1. Introduction
1.0 Product Overview
The MHX-910A is a very high-performance wireless module. When used
properly very long distance communication at very high speeds can be
accomplished. The MHX-910A operates in the 902 - 928 MHz ISM band,
using frequency-hopping spread-spectrum module is capable of providing
reliable wireless data transfer between almost any equipment which uses an
RS232, RS422, or RS485 interfaces. The small-size and superior RF
performance of this product makes it ideal for many applications. Typical
uses for this module include:
SCADA
Remote Telemetry
Surveillance
Traffic Control
Industrial Controls
Remote Monitoring
Fleet Management
GPS
Wireless Video
Robotics
Security
Display Signs
Railway Signaling
Many others
While a pair of MHX-910A 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” operation. Multiple independent networks can operate
concurrently, so it is possible for unrelated communications to take place in
the same or a nearby area without sacrificing privacy or reliability.
2 MHX 910A Operating Manual: Chapter 1 Introduction
1.1 Features
Key features of the MHX-910A include:
transmission within a public, license-exempt band of the radio
spectrum1 – this means that it can be used without access fees
(such as those incurred by cellular airtime);
Transparent, low latency link providing true 115.2 kbps
continuous throughput
Communicates with virtually all PLCs, RTUs, and serial
devices through RS232, RS422 and RS485 interface
3.3V or 5V logic level compatibility
Industrial temperature specifications
Supports point-to-point, point-to-multipoint, Store and Forward
Repeater, TDMA, Multimaster
Maximum allowable transmit power, (1W)
Low power consumption in Sleep Mode (Real-Time Clock
wakeup)
32-bit CRC, selectable forward error correction with
retransmission
Separate diagnostics port - transparent remote diagnosis and
online network control
Backwards Compatible with MHX-910
ease of installation and use – the MHX-910A module uses a
subset of standard AT style commands, very similar to those
used by traditional telephone line modules.
While the typical application for the MHX-910A 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.
1 902-928 MHz, which is license-free within North America; may need to be factory-configured
differently for some countries.
MHX 910A Operating Manual: Chapter 1 Introduction 3
4 MHX 920 Operating Manual: Chapter 2 Configuration
2. Configuration
2.0 Overview
This chapter provides a detailed description of the various operating
parameters of the MHX-910A.
2.1 Output Power Level
The Output Power Level determines at what power the MHX-910A
transmits. The MHX-910A’s sensitive receiver can operate with very low
power levels, so it is recommended that the lowest power necessary is used;
using excessive power contributes to unnecessary “RF pollution”.
The allowable settings are:
0 1 mW
1 10 mW
*2 100 mW
3 1000 mW
Ideally, you should test the communications performance between units
starting from a low power level and working upward until the RSSI is
sufficiently high and a reliable link is established. The conditions will vary
widely between applications; the output power settings can be calculated
based on following information.
• Transmitter antenna gain
• Cable loss
• Effective radiated power (ERP) requirement by FCC Regulations
Power Setting = 36 – Antenna Gain – Cable Loss
The power setting must be no more than the above calculation value. Any
higher is a violation of FCC rules.
MHX 920 Operating Manual: Chapter 2 Configuration 5
WARNING
In order to comply with the
FCC/IC adopted RF
exposure requirements, this
transmitter system will be
installed by the
manufacturer's reseller
professional. Installation of
all antennas must be
performed in a manner that
will provide at least 23 cm
clearance from the front
radiating aperture, to any
user or member of the
public.
IMPORTANT:
FCC Regulations allow up to 36 dBi effective radiated power (ERP).
Therefore, the sum of the transmitted power (in dBm), the cabling loss
and the antenna gain cannot exceed 36 dBi.
1 mW = 0 dBm
10 mW = 10 dBm
100 mW = 20 dBm
1000 mW = 30 dBm
For example, when transmitting 1 Watt (30 dBm), with cabling losses of
2 dB, the antenna gain cannot exceed 36 - 30 + 2 = 8 dBi. If an antenna
with a gain higher than 8 dBi were to be used, the power setting must be
adjusted appropriately. Violation of FCC regulations can result in
severe fines.
MHX 910A Operating Manual: Chapter3 Installation 7
3. Installation
3.0 Overview
The installation, removal or maintenance of all antenna
components must be carried out by qualified and
experienced personnel.
The MHX-910A 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
MHX-910A module.
3.1 Estimating the Gain Margin
Successful communication between MHX-910A modules is dependent on
three main factors:
• System Gain
• Path Loss
• Interference
System gain is a calculation in dB describing the performance to be expected
between 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 selectable 0, 20 to 30dBm)
2. Transmitter gain (transmitting antenna gain minus cabling loss between
the transmitting antenna and the MHX-910A module)
3. Receiver gain (Receiving antenna gain minus cabling loss between the
receiving antenna and the module)
4. Receiver sensitivity (Specified as -105dBm on the MHX-910A module)
In the following illustration, the transmitting antenna has a gain of 6 dB, and
the receiving antenna has a gain of 3 dB. The cable loss between the module
and the antenna is 2 dB on both the transmitting and receiving side.
Figure 1 Gain Calculation
Transmitter
30 dBm
Output Power
Receiver
Sensitivity =
-105 dBm
Cable Loss = 2 dBCable Loss = 2 dB
Antenna Gain = 6 dB Antenna Gain = 3 dB
8 MHX 920 Operating Manual: Chapter 3 Installation
Base Height (m)
Mobile
Height
(m)
Distance (km)
Figure 2 System Deploying
The power level has been set to 30dBm (1W) on the transmitter, and the
receiver sensitivity for the MHX-910A is -105dBm.
System gain can be calculated:
30 - 2 + 6 + 3 - 2 + 105 = 140 dB.
When deploying your system, care must be taken to ensure the path loss
(reduction of signal strength from transmitter to receiver in dB) between
equipment does not exceed the system gain (140 dB in the above example).
It is recommended to design for a gain margin of at least 20 dB to ensure
reliable communication. Gain margin is the difference between system gain
and path loss. Referring to the same example, suppose the path loss is 113
dB, the gain margin would be 30 dB, which is more than adequate for
reliable communication.
Path loss is a very complicated calculation which mainly depends on the
terrain profile, and the height of the antennas off the ground.
The following table provides path loss numbers for varying antenna heights
and antenna separation: These numbers are real averages taken from rural
environments. They do not apply to urban, non-line-of-sight environments.
Table 1 Path Loss
Distance
(km)
Base Height
(m)
Mobile Height
(m)
Path Loss
(dB)
5 15 2.5 116.5
5 30 2.5 110.9
8 15 2.5 124.1
8 15 5 117.7
8 15 10 105
16 15 2.5 135.3
16 15 5 128.9
16 15 10 116.2
16 30 10 109.6
16 30 5 122.4
16 30 2.5 128.8
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 -105dBm. For consistent reliable communication,
you should try to deploy the equipment such that signal strength exceeds -
85dBm.
MHX 910A Operating Manual: Chapter3 Installation 9
3.2 Internal Cabling
This section describes the recommended procedure for installing cabling and
antennas for use with the MHX-910A module.
The most common method for installing the module is to run a cable from
the module’s MCX connector to a reverse TNC bulkhead connector on the
chassis of the equipment as shown in Figure 3. This cable can be purchased
from Microhard Systems.
Figure 3 Suggested Internal Cabling
Cable losses are negligible for the short piece used within the chassis.
Additional losses up to 0.5 dB may be present in the MCX and Reverse TNC
connections.
RG316 Cable with MCX
male connector and
Reverse TNC bulkhead
connector
Reverse TNC connector
MCX female connector
MHX-910A
10 MHX 910A Operating Manual: Chapter3 Installation
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
Direct human contact with
the antenna is potentially
unhealthy when a MHX-
910A is generating RF
energy. Always ensure that
the MHX-910A equipment
is powered down during
installation.
WARNING
Never work on an antenna
system when there is
lightning in the area.
3.3 Installing External Cables, Antennas and
Lightning Arrestors
The installation, removal or maintenance of all antenna components must be
carried out by qualified and experienced personnel.
Never work on an antenna system when there is lightning in the area.
Direct human contact with the antenna is potentially unhealthy when the
MHX-910A is generating RF energy. Always ensure that the MHX-910A
equipment is powered down during installation. At all time, a distance of 23
cm must be maintained between the antenna 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 interface with the
equipment. The surge arrestor grounding system should be fully
interconnected with the transmission tower and power grounding systems to
form a single, fully integrated ground circuit. Typically, both ports on surge
arrestors are N-female.
External Filter
Although the MHX-910A is capable of filtering out RF noise in most
environments, there are circumstances that require external filtering. Paging
towers, and cellular base stations in close proximity to the MHX-910A
antenna can desensitize the receiver. Microhard Systems’ external cavity
filter eliminates this problem. The filter has two N-female ports and should
be connected in line at the interface to the RF equipment.
Weatherproofing
Type N and RTNC connectors are not weatherproof. All connectors should
be taped with rubber splicing tape (weatherproofing tape), and then coated
with a sealant.
Cabling
The following coax cables are recommended:
Table 2 Cable Loss
Cable Loss (dB/100ft)
LMR 195 10.7
LMR 400 3.9
LMR 600 2.5
MHX 910A Operating Manual: Chapter3 Installation 11
Factors to take into consideration when choosing a cable are:
• price;
• bend radius limitations (the lower performance cables generally can
bend more sharply)
• performance requirements; and,
• distance between the equipment and the antenna.
When installing the cable, always begin fastening at the top near the antenna
connector/surge arrestor. The cable must be supported at the top with a hose
clamp or wrap lock, and at 5 ft intervals down the length of the tower. Over-
tightening the fasteners will dent the cable and reduce performance. If
properly grounded surge arrestors are not installed at both the top and the
bottom of the cable, then the cable should be grounded to the tower at these
locations using a cable grounding kit. If the tower is non-conductive, then a
separate conductor, physically separate from the cable, should be run down
the tower.
12 MHX 920 Operating Manual: Chapter 3 Installation
To comply with FCC regulations,
.you must limit ERP to 36 dBm or
less.
Antenna
Before choosing an antenna, you should have some knowledge of the path
loss and the topology of the equipment. 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 margin. When deploying the Yagi, point the antenna
towards the intended target, ensuring the antenna elements are perpendicular
to the ground for vertical polarization.
In applications where there are multiple units that you must communicate
with or units, which are in motion, you may select an Omni-directional
antenna with appropriate gain.
FCC Regulations allow up to 36dBm effective radiated power (ERP).
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.
ERP is calculated as follows:
ERP = Tx Power (dBm) - Cable/Connector Loss (dB) + Antenna Gain (dBi)
Antenna Gains must be in dBi when calculating the 36dBm ERP limit.
1dBd = 2.15dBi
Use the guidelines in the previous section for calculating cable and connector
losses. If cabling and connector losses are 2 dB, then the maximum
allowable gain of the antenna will be 8 dB.
MHX 910A Operating Manual: Chapter3 Installation 13
Examples:
FCC and Industry Canada Regulations allow up to 36dBm effective
radiated power (ERP). 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.
Example 1)
What is the maximum power the MHX-910A can be set to comply with
FCC and IC given the following equipment given a Rubber Ducky
Antenna Gain 2dBi and no cable or connectors in the system?
Max ERP 36dBm
Max TX power = ERP – Ant Gain(dBi) + Cable/Connector loss (dB)
Ant Gain dBi = 2dBi
Max TX power = 36dBm – 2dBi + 0dB = 34dBm
We can set the modem to the maximum power setting of 30dBm.
Example 2)
What is the maximum power the MHX-910A can be set to comply with
FCC and IC given the following equipment given a Yagi Antenna Gain
12dBd and cable and connector loss of 4.5 dB?
Max ERP 36dBm
Max TX power = ERP – Ant Gain(dBi) + Cable/Connector loss (dB)
Ant Gain dBi = Ant Gain dBd + 2.15 dB
Yagi Gain (dBi) = 12 + 2.15 = 14.15dBi
Max TX power = 36dBm – 14.15dB + 4.5dB = 26.35dBm
We must round down
Hence Max TX power = 26dBm
Example 3)
What is the maximum power the MHX-910A can be set to comply with
FCC and IC given the following equipment given a Omni Antenna Gain
6dBd and cable and connector loss of 2.5 dB?
Max ERP 36dBm
Max TX power = ERP – Ant Gain(dBi) + Cable/Connector loss (dB)
Ant Gain dBi = Ant Gain dBd + 2.15 dB
Omni Gain (dBi) = 6 + 2.15 = 8.15dBi
Max TX power = 36dBm – 8.15dB + 2.5dB = 30.35dBm
Hence Max TX power = 30dBm
14 MHX 920 Operating Manual: Chapter 3 Installation
MHX 910A Operating Manual: Appendix A Approved Antennas 15
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
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 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). Please Contact Microhard Systems
Inc. if you need more information.
16 MHX 910A Operating Manual: Appendix A Approved Antennas