User Manual

FCC ID: NS9N920X2

Users Manual

Download: PDF
FCCID_4142591

Operating Manual




n920X2
900 MHz Spread Spectrum OEM Transceiver
Revision 0.30, January 22, 2019




www.microhardcorp.com


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
and which Microhard Systems Inc. determines does not conform to the warranty. Product returned to Microhard Systems Inc. for
warranty service will be shipped to Microhard Systems Inc. at Buyer’s expense and will be returned to Buyer at Microhard
Systems Inc.’s expense. In no event shall Microhard Systems Inc. be responsible under this warranty for any defect which is
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.

Warranty Disclaims
Microhard Systems Inc. makes no warranties of any nature of kind, expressed or implied, with respect to the hardware, software,
and/or products and hereby disclaims any and all such warranties, including but not limited to warranty of non-infringement,
implied warranties of merchantability for a particular purpose, any interruption or loss of the hardware, software, and/or product,
any delay in providing the hardware, software, and/or product or correcting any defect in the hardware, software, and/or product,
or any other warranty. The Purchaser represents and warrants that Microhard Systems Inc. has not made any such warranties to
the Purchaser or its agents MICROHARD SYSTEMS INC. EXPRESS WARRANTY TO BUYER CONSTITUTES
MICROHARD SYSTEMS INC. SOLE LIABILITY AND THE BUYER’S SOLE REMEDIES. EXCEPT AS THUS
PROVIDED, MICROHARD SYSTEMS INC. DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING
ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PROMISE.

MICROHARD SYSTEMS INC. PRODUCTS ARE NOT DESIGNED OR INTENDED TO BE USED IN
ANY LIFE SUPPORT RELATED DEVICE OR SYSTEM RELATED FUNCTIONS NOR AS PART OF
ANY OTHER CRITICAL SYSTEM AND ARE GRANTED NO FUNCTIONAL WARRANTY.


Indemnification
The Purchaser shall indemnify Microhard Systems Inc. and its respective directors, officers, employees, successors
and assigns including any subsidiaries, related corporations, or affiliates, shall be released and discharged from any
and all manner of action, causes of action, liability, losses, damages, suits, dues, sums of money, expenses
(including legal fees), general damages, special damages, including without limitation, claims for personal injuries,
death or property damage related to the products sold hereunder, costs and demands of every and any kind and
nature whatsoever at law.

IN NO EVENT WILL MICROHARD SYSTEMS INC. BE LIABLE FOR ANY INDIRECT, SPECIAL,
CONSEQUENTIAL, INCIDENTAL, BUSINESS INTERRUPTION, CATASTROPHIC, PUNITIVE OR OTHER
DAMAGES WHICH MAY BE CLAIMED TO ARISE IN CONNECTION WITH THE HARDWARE,
REGARDLESS OF THE LEGAL THEORY BEHIND SUCH CLAIMS, WHETHER IN TORT, CONTRACT OR
UNDER ANY APPLICABLE STATUTORY OR REGULATORY LAWS, RULES, REGULATIONS,
EXECUTIVE OR ADMINISTRATIVE ORDERS OR DECLARATIONS OR OTHERWISE, EVEN IF
MICROHARD SYSTEMS INC. HAS BEEN ADVISED OR OTHERWISE HAS KNOWLEDGE OF THE
POSSIBILITY OF SUCH DAMAGES AND TAKES NO ACTION TO PREVENT OR MINIMIZE SUCH
DAMAGES. IN THE EVENT THAT REGARDLESS OF THE WARRANTY DISCLAIMERS AND HOLD
HARMLESS PROVISIONS INCLUDED ABOVE MICROHARD SYSTEMS INC. IS SOMEHOW HELD
LIABLE OR RESPONSIBLE FOR ANY DAMAGE OR INJURY, MICROHARD SYSTEMS INC.'S LIABILITY
FOR ANYDAMAGES SHALL NOT EXCEED THE PROFIT REALIZED BY MICROHARD SYSTEMS INC.
ON THE SALE OR PROVISION OF THE HARDWARE TO THE CUSTOMER.
Proprietary Rights
The Buyer hereby acknowledges that Microhard Systems Inc. has a proprietary interest and intellectual property rights in the
Hardware, Software and/or Products. The Purchaser shall not (i) remove any copyright, trade secret, trademark or other evidence
of Microhard Systems Inc.’s ownership or proprietary interest or confidentiality other proprietary notices contained on, or in, the
Hardware, Software or Products, (ii) reproduce or modify any Hardware, Software or Products or make any copies thereof, (iii)
reverse assemble, reverse engineer or decompile any Software or copy thereof in whole or in part, (iv) sell, transfer or otherwise
make available to others the Hardware, Software, or Products or documentation thereof or any copy thereof, except in accordance
with this Agreement.




ii                                                                                                       N920X2 Operating Manual


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.

       WARNING:
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.

       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).

       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:
NOTE: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the
FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This
equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions,
may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a
particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined
by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following
measures:
—Reorient or relocate the receiving antenna.
—Increase the separation between the equipment and receiver.
—Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
—Consult the dealer or an experienced radio/TV technician for help.

       WARNING:
This device contains license-exempt transmitter(s)/receiver(s) that comply with Innovation, Science and Economic Development
Canada’s license-exempt RSS(s). Operation is subject to the following two conditions:
1.   This device may not cause interference.
2.   This device must accept any interference, including interference that may cause undesired operation of the device.

       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: n920X2:

  Contains:

  FCC ID: NS9N920X2           IC : 3143A-N920X2

  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.




                                                                                                                                            iii


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 0.474 (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 - 0.474 < 0.526. The following co-
location were evaluated for mobile configurations:

       1) EUT with 3 dBi dipole antenna co-located with LTE Data Module LM940
          (FCC ID RI7LM940, IC: 5131A-LM940)

       2) EUT with 3 dBi dipole antenna co- located with LTE Data Module L850
           ( FCC ID ZMOL850GL, IC 21374-L850GL)

       3) EUT with 3 dBi dipole antenna co- located with LTE Data Module SARA-R410M
           ( FCC ID XPY2AGQN4NNN, IC 8595A-2AGQN4NNN)

       4) EUT with 3 dBi dipole antenna co- located with LTE Data Module LE910-NA-V2
           ( FCC ID RI7LE910NAV2, IC 5131A-LE910NAV2 )




iv                                                                                         N920X2 Operating Manual


Contents
           Indemnification.................................................................................................................................................................... ii
       Proprietary Rights ................................................................................................................................................. ii
       n920X2 Regulatory Requirements ....................................................................................................................... iii
       Co-Location with Cellular Modems .....................................................................................................................iv
CONTENTS ................................................................................................................................................................ V
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 CABLING ................................................................................................................................................. 5
       3.2.1           Internal Cabling .....................................................................................................................................5
       3.2.2           Installing External Cables, Antennas and Lightning Arrestors .............................................................. 6




                                                                                                                                                                                               v




                                                    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 spread-
spectrum 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.

While a pair of n920X2 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.

1.1 Features
Key features of the n920X2 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).
        ◼ a serial I/O data port with handshaking and hardware flow
          control, allowing the n920X2 to interface directly to any
          equipment with an asynchronous serial interface.
        ◼ ease of installation and use – the n920X2 module uses a subset
          of standard AT style commands, very similar to those used by
          traditional telephone line modems.
        ◼ all units in a system are physically identical, and can be
          configured as a master, repeater or slave using the AT
          command set. No hardware modifications are required
        ◼ 128 sets of user-selectable pseudo-random hopping patterns,
          intelligently designed to offer the possibility of separately
          operating multiple networks while providing security,
          reliability and high tolerance to interference.
        ◼ encryption key with 65536 user-selectable values to maximize
          security and privacy of communications.
        ◼ 32-bit of CRC error detection and auto re-transmit to provide
          accuracy and reliability of data.




1
    902-928 MHz, which is license-free within North America; may need to be factory-
    configured differently for some countries.



                                                                                       1


         ◼ TDMA (time division multiple access) support, allowing
            multi-slave access in point-to-point mode.
         ◼ roaming ability, allowing repeaters and slaves to re-
            synchronize 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 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.


    2.1 Output Power Level
    The Output Power Level determines at what power the n920X2 transmits.
    The n920X2’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”.
    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
    •   Equivalent Isotropically Radiated Power (EIRP) 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. See IMPORTANT warning below.
    Table 1 Output Power

            Power Setting      Approx. Output Power
               (dBm)                   (mW)
                   0                        1
                  20                      100
                  21                      125
                  22                      160
                  23                       200
                  24                       250
                  25                       320
                  26                       400
                  27                       500
                  28                       630
                  29                       800
                  30                      1000




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.

                        3.1 Estimating the Gain Margin
                        Successful communication between n920X2 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)
                        2.      Transmitter gain (transmitting antenna gain minus cabling loss between
                                the transmitting antenna and the n920X2 module)
                        3.      Receiver gain (Receiving antenna gain minus cabling loss between the
                                receiving antenna and the module)
                        4.      Receiver sensitivity (Specified as -108dBm on the n920X2 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.


                                      Cable Loss = 2 dB                                           Cable Loss = 2 dB


                                                      Antenna Gain = 6 dB   Antenna Gain = 3 dB


                             Transmitter                                                                         Receiver

                              30 dBm                                                                           Sensitivity =
                            Output Power                                                                        -105 dBm




Chapter3 Installation                                                                                                          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.

         Base Height (m)



                           Mobile
                           Height
                            (m)




                 Distance (km)


    Figure 2 System Deploying
    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 100
    dB, the gain margin would be 40 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 2 Path Loss

      Distance              Base Height   Mobile Height        Path Loss
       (km)                     (m)           (m)                (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




4                                                    n920X2 Operating Manual


                          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.
                          3.2.1   Internal Cabling
                          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.

                                         Reverse TNC Connector




                                                          RG316 Cable
                                                         with MMCX male
                                                            connector
                                                        and Reverse TNC
                                                            bulkhead
                                                            connector
                                                  MMCX female connector
                                         N920X2




                          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.




n920X2 Operating Manual                                                                            5


                                      3.2.2     Installing External Cables, Antennas and Lightning
                                                Arrestors
     WARNING:                         Never work on an antenna system when there is lightning in the area.
To satisfy FCC RF exposure
requirements for mobile               Direct human contact with the antenna is potentially unhealthy when the
transmitting devices, a separation    n920X2 is generating RF energy. Always ensure that the n920X2
distance of 35 cm or more should      equipment is powered down during installation. At all times a distance of
be maintained between the             35 cm must be maintained between the antenna and any person when the
antenna of this device and            device is in operation.
persons during device operation.
                                      Surge Arrestors
To ensure compliance, operations
at closer than this distance is not   The most effective protection against lightning is to install two lightning
recommended. The antenna used         (surge) arrestors, one at the antenna, the other one at the interface with the
for this transmitter must not be      equipment. The surge arrestor grounding system should be fully
co-located in conjunction with        interconnected with the transmission tower and power grounding systems to
any other antenna or transmitter.     form a single, fully integrated ground circuit. Typically, both ports on surge
                                      arrestors are N-female.
                                      External Filter
                                      Although the n920X2 is capable of filtering out RF noise in most
     WARNING:                         environments, there are circumstances that require external filtering.
Direct human contact with the         Paging towers and cellular base stations in close proximity to the n920X2
antenna is potentially unhealthy      antenna can desensitize the receiver. Microhard Systems’ external cavity
when the n920X2 is generating         filter eliminates this problem. The filter has two N-female ports and should
RF energy. Always ensure that         be connected in line at the interface to the RF equipment.
the n920X2 equipment is               Weatherproofing
powered down during
installation.                         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.


     WARNING:                         Cabling
Never work on an antenna              The following coax cables are recommended:
system when there is lightning in
the area.                             Table 3 Cable Loss

                                           Cable        Loss (dB/100ft)
                                          LMR 195             10.7
                                          LMR 400              3.9
                                          LMR 600              2.5

                                      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.




6                                                                                       n920X2 Operating Manual


                                    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
     WARNING:                       the top and the bottom of the cable, then the cable should be grounded to
MAXIMUM EIRP                        the tower at these locations using a cable grounding kit. If the tower is non-
FCC and IC Regulations allow        conductive, then a separate conductor, physically separate from the cable,
up to 36dBm effective               should be run down the tower.
isotropically radiated power
(EIRP). Therefore, the sum of       Antenna
the transmitted power (in dBm),     Before choosing an antenna, you should have some knowledge of the path
the cabling loss and the antenna    loss and the topology of the equipment. If the equipment is in a fixed
gain cannot exceed                  location and is to communicate with only one other unit also in a fixed
36 dBm with respect to the          location, then a Yagi antenna is suitable. Choose a Yagi with enough gain
isotropic radiator.                 to ensure adequate gain margin. When deploying the Yagi, point the
                                    antenna towards the intended target, ensuring the antenna elements are
     WARNING:                       perpendicular to the ground for vertical polarization.
The n920X2 can only be used
                                    In applications where there are multiple units that you must communicate
with any antennas listed in
                                    with or units, which are in motion, you may select an Omni-directional
Appendix A.
                                    antenna with appropriate gain.
                                    See appendix A for a list of approved antennas that can be used with
     WARNING:                       the n920X2 radio modem. If you require another type of antenna
Be careful with dBi vs dBd gains    please contact Microhard Systems Inc. The n920X2 CANNOT be used
on antenna specifications.          with any antenna that does not appear in Appendix A.
Antenna manufactures may not        Microhard Systems Inc. can provide you with approved antennas to ensure
clearly indicate the gain on the    FCC and Industry Canada compliance.
antenna if it is dBd or dBi. Note
1dBd = 2.15dBi.                     FCC 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.
                                    EIRP is calculated as follows:
                                    EIRP = Tx Power(dBm) - Cable/Connector Loss(dB) + Ant Gain(dBi)


                                    Antenna Gains must be in dBi when calculating the 36dBm EIRP 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.

                                    Examples of Antenna and Power settings to maintain 36dBm EIRP
                                    Antenna            Power Level       Minimum Cable / Loss              EIPR
                                    8.15 dBi Omni      30dBm             25 feet LMR195 / 2.675dB          35.475dBm
                                    12.5 dBi Patch     23dBm             10 feet LMR195 / 1.07dB           34.43dBm
                                    14.15 dBi Yagi     21dBm             10 feet LMR400 / 0.39dB           34.76dBm




n920X2 Operating Manual                                                                                           7


    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.
    Example 1)
    What is the maximum power the n920X2 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 – 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 n920X2 can be set to comply with
    FCC and IC given the following equipment given a Yagi Ant Gain
    11dBd and cable and connector loss of 4.5 dB?
    Max EIRP 36dBm
    Max TX power = EIRP – Ant Gain(dBi) + Cable/Connector loss (dB)
    Ant Gain dBi = Ant Gain dBd + 2.15 dB
    Yagi Gain (dBi) = 11 + 2.15 = 13.15dBi
    Max TX power = 36dBm – 13.15dB + 4.5dB = 27.35dBm
    We must round down
    Hence Max TX power = 27dBm
    Example 3)
    What is the maximum power the n920X2 can be set to comply with
    FCC and IC given the following equipment given a Omni Ant Gain
    6dBd and cable and connector loss of 2.5 dB?
    Max EIRP 36dBm
    Max TX power = EIRP – 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




8                                               n920X2 Operating Manual


                                             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.
Group              Part Number           Description
Rubber Ducky
                   MHS031000             3dBi, 900MHz Rubber Ducky Antenna RPTNC Swivel
                   MHS031070             3dBi, 900MHz Rubber Ducky Antenna Reverse SMA Swivel
                   MHS031080             3dBi, 900MHz Rubber Ducky Antenna Reverse SMA Straight


Puck Antennas
                   MHS035460             4dBi, Puck Antenna 700-960 MHz/1575-2700 MHz Mag Mount
                   MHS035480             4dBi, Puck Antenna Main and Div 700-960 MHz/1575-2700 MHz Mag Mount
                   MHS035470             4dBi, Puck Antenna Main and Div 700-960 MHz/1575-2700 MHz Permanent Mount


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


Patch Antennas
                   MHS031440             8dBi 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 above, and having a maximum gain
  of 13.15 dBi. Antennas not included in this list or having a gain greater than 13.15 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.




n920X2 Operating Manual                                                                                                     9



Document Created: 2019-01-22 15:43:15
Document Modified: 2019-01-22 15:43:15

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