Microhard Systems pMXDDL2450 User manual

Operating Manual
pMXDDL2450
2X2 MIMO 2.4 GHz OEM DDL Module
(1W)
Revision 0.26
,
October 3, 2022
www.microhardcorp.com
Microhard Systems Inc.

ii PMXDDL2450 Operating Manual
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.

iii
pMXDDL2450 Regulatory Requirements - PLEASE READ THIS SECTION
CAREFULLY
WARNING:
To satisfy FCC RF exposure requirements for mobile transmitting devices, a separation distance of 25 cm (38 cm co-location with LTE
module), 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 UFL to 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.
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.
SAMPLE LABEL REQUIREMENT:
Contains:
pMXDDL2450
FCC ID: NS9PMXDDL2450
IC : 3143A-PMXDDL2450
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.

iv PMXDDL2450 Operating Manual
pMXDDL2450 Exigences Réglementaires
WARNING:
Pour satisfaire aux exigences d'exposition RF de la FCC pour les appareils de transmission mobiles, une distance de séparation de 25
cm (colocation de 38 cm avec le module LTE) ou plus doit être maintenue entre l'antenne de cet appareil et les personnes pendant le
fonctionnement de l'appareil. Pour garantir la conformité, les opérations à une distance inférieure à cette distance ne sont pas
recommandées. L'antenne utilisée pour cet émetteur ne doit pas être co-localisée avec une autre antenne ou un autre émetteur.
WARNING:
Son fonctionnement est soumis aux deux conditions suivantes : ( 1 ) ce dispositif ne doit pas causer d'interférences nuisibles et ( 2) cet
appareil doit accepter toute interférence reçue, incluant les interférences qui peuvent provoquer un fonctionnement indésirable .
WARNING:
Les changements ou modifications non expressément approuvés par Microhard Systems Inc. pourraient annuler l'autorité de
l'utilisateur à utiliser l'équipement . Ce dispositif a été testé avec MCX et connecteurs SMA à polarité inverse sur les antennes
répertoriées à l'annexe A Lorsqu'il est intégré dans les produits OEM , antennes fixes nécessitent une installation empêchant les
utilisateurs finaux de les remplacer par des antennes non approuvées . Antennes ne figurant pas dans les tableaux doivent être testés
pour se conformer à la Section 15.203 (connecteurs d'antenne uniques ) et à la Section 15.247 ( émissions ) .
WARNING:
MAXIMUM PIRE
Règlement FCC permettent jusqu'à 36 dBm puissance isotrope rayonnée équivalente ( PIRE) . Par conséquent, la somme de la puissance
émise ( en dBm ), la perte de câblage et le gain d'antenne ne peut pas dépasser 36 dBm.
WARNING:
ÉQUIPEMENT DE MARQUAGE
Les numéros FCC et IC dépendent du modèle du module radio . Ne pas utiliser le nom marketing du produit, mais le modèle de
distinguer les numéros Certifications . Ce dispositif a été approuvé de façon modulaire . Le fabricant , nom du produit, et les
identificateurs de la FCC et d'Industrie Canada de ce produit doivent figurer sur l'étiquette à l'extérieur de l'équipement de l'utilisateur
final .
WARNING:
L’émetteur/récepteur exempt de licence contenu dans le présent appareil est conforme aux CNR d’Innovation, Sciences et
Développement économique Canada applicables aux appareils radio exempts de licence. L’exploitation est autorisée aux deux
conditions suivantes :
1. L’appareil ne doit pas produire de brouillage;
2. L’appareil doit accepter tout brouillage radioélectrique subi, même si le brouillage est susceptible d’en compromettre le
fonctionnement.
SAMPLE LABEL REQUIREMENT:
Contains:
pMXDDL2450
FCC ID: NS9PMXDDL2450
IC : 3143A-PMXDDL2450
Cet appareil est conforme à la partie 15 des règles de la
FCC . Son fonctionnement est soumis aux deux conditions
suivantes : ( 1 ) ce dispositif ne doit pas causer
d'interférences nuisibles et ( 2) cet appareil doit accepter
toute interférence reçue, incluant les interférences qui
peuvent provoquer un fonctionnement indésirable .

v
Co-Location with Cellular Modems
Co-location MPE conditions of EUT with 2.5 dBi dipole and LTE module were evaluated at 38 cm distance. The
following were evaluated for mobile configurations:
1) EUT with 2.5 dBi dipole antenna co-located with LTE Data Card Module
(FCC ID: XMR201808EC25AF, IC: 10224A-2018EC25AF)
2) EUT with 2.5 dBi dipole antenna co- located with LTE Data Card Module
(FCC ID: XMR201903EG25G, IC: 10224A-201903EG25G)
3) EUT with 2.5 dBi dipole antenna co- located with LTE Data Card Module
(FCC ID: XMR201910BG95M3, IC: 10224A-2019BG95M3)
4) EUT with 2.5 dBi dipole antenna co- located with LTE Data Card Module
(FCC ID: XMR201901EM12G, ISED/IC: 10224A-201901EM12G)
Co - localisation avec Cellular Modem
Les conditions MPE de co-localisation de l'EUT avec un dipôle de 2,5 dBi et un module LTE ont été évaluées à une
distance de 38 cm. Les éléments suivants ont été évalués pour les configurations mobiles :
1 ) EUT avec antenne dipôle 2.5 dBi co-localisée avec le module de carte de données LTE
(FCC ID: XMR201808EC25AF, ISED/IC: 10224A-2018EC25AF)
2 ) EUT avec antenne dipôle 2.5 dBi co-localisée avec le module de carte de données LTE
(FCC ID: XMR201903EG25G, ISED/IC: 10224A-201903EG25G)
3 ) EUT avec antenne dipôle 2.5 dBi co-localisée avec le module de carte de données LTE
(FCC ID: XMR201910BG95M3, ISED/IC: 10224A-2019BG95M3)
4 ) EUT avec antenne dipôle 2.5 dBi co-localisée avec le module de carte de données LTE
(FCC ID: XMR201901EM12G, ISED/IC: 10224A-201901EM12G)

vi PMXDDL2450 Operating Manual
Contents
Warranty ....................................................................................................................................................................... ii
Proprietary Rights ......................................................................................................................................................... ii
pMXDDL2450 Regulatory Requirements ................................................................................................................ iii
pMXDDL2450 Exigences Réglementaires.................................................................................................................iv
Co-Location Instructions ............................................................................................................................................... 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

1
1 2400-2483.5 MHz, which is license-free
2. General
2.0 Product Overview
The pMXDDL2450 is a high-performance embedded wireless data
transceiver. Operating in the 2400 – 2483.5 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 pMXDDL2450 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 pMXDDL2450 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 pMXDDL2450 to interface directly to
any equipment with an asynchronous serial interface.
 ease of installation and use – the pMXDDL2450 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.
within North America; may need to be factory-configured differently for some countries.

2
 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 pMXDDL2450 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 pMXDDL2450
transmits. The pMXDDL2450 ’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
(dBm)
Approx. Output Power
(mW)
20 100
21 125
22 160
23 200
24 250
25 320
26 400
27 500
28 630
29 800
30 1000

Chapter3 Installation 3
3. Installation
3.0 Overview
The pMXDDL2450 complies with FCC part 15 at the modular level for
operation in the license-free 2400-2483.5 MHz ISM band. This chapter
provides guidelines for installing and deploying equipment which
incorporates the pMXDDL2450 module.
3.1 Estimating the Gain Margin
Successful communication between pMXDDL2450 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 pMXDDL2450 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 pMXDDL2450
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.
Transmitter
30 dBm
Output Power
Receiver
Sensitivity =
-105 dBm
Cable Loss = 2 dB Cable Loss = 2 dB
Antenna Gain = 6 dB Antenna Gain = 3 dB

4 pMXDDL2450 Operating Manual
Figure 1 Gain Calculation
The power level has been set to 30dBm (1W) on the transmitter, and the
receiver sensitivity for the pMXDDL2450 is -108dBm.
System gain would be calculated to be:
30 - 2 + 6 + 3 - 2 + 108 = 143 dB.
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
(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
Base Height (m)
Mobile
Height
(m)
Distance (km)

pMXDDL2450 Operating Manual 5
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 pMXDDL2450 module.
3.2.1 Internal Cabling
The most common method for installing the module is to run a cable from the
module’s UFL 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 UFL
connector
and Reverse TNC
bulkhead
connector
Reverse TNC Connector
UFL connector
PMXDDL2
450

6 pMXDDL2450 Operating Manual
WARNING:
To satisfy FCC RF exposure
requirements for mobile
transmitting devices, a separation
distance of 25 cm (38cm
collocated with LTE module) 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 the pMXDDL2450 is
generating RF energy. Always
ensure that the pMXDDL2450
equipment is powered down
during installation.
WARNING:
Never work on an antenna
system when there is lightning in
the area.
3.2.2 Installing External Cables, Antennas and Lightning
Arrestors
Never work on an antenna system when there is lightning in the area.
Direct human contact with the antenna is potentially unhealthy when the
pMXDDL2450 is generating RF energy. Always ensure that the
pMXDDL2450 equipment is powered down during installation. At all
times 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 pMXDDL2450 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
pMXDDL2450 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 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.

pMXDDL2450 Operating Manual 7
WARNING:
MAXIMUM EIRP
FCC and IC 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
36 dBm with respect to the
isotropic radiator.
WARNING:
The pMXDDL2450 can only be
used with any antennas listed in
Appendix A.
WARNING:
Be careful with dBi vs dBd gains
on antenna specifications.
Antenna manufactures may not
clearly indicate the gain on the
antenna if it is dBd or dBi. Note
1dBd = 2.15dBi.
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.
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.
See appendix A for a list of approved antennas that can be used with
the pMXDDL2450 radio modem. If you require another type of
antenna please contact Microhard Systems Inc. The pMXDDL2450
CANNOT be used with any antenna that does not appear in Appendix
A.
Microhard Systems Inc. can provide you with approved antennas to ensure
FCC and Industry Canada compliance.
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

8 pMXDDL2450 Operating Manual

pMXDDL2450 Operating Manual 9
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
pMXDDL2450 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
pMXDDL2450 can be set to
comply with FCC and IC given
the following equipment given a
Yagi Ant Gain 12dBd 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) = 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 pMXDDL2450 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

10 pMXDDL2450 Operating Manual
A. Approved Antennas
This radio transmitter (IC:3143A-PMXDDL2450) 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.
Le présent émetteur radio ( IC : 3143A-PMXDDL2450) a été approuvé par Innovation, Sciences et Développement
économique Canada pour fonctionner avec les types d'antenne énumérés ci‑dessous et ayant un gain admissible maximal.
Les types d'antenne non inclus dans cette liste, et dont le gain est supérieur au gain maximal indiqué pour tout type
figurant sur la liste, sont strictement interdits pour l'exploitation de l'émetteur.
Part Number
Description
Rubber Ducky
MHS031
1
00
2
dBi,
2.4G
Hz Rubber Ducky Antenna RPTNC Swivel
MHS031
11
0
2
dBi,
2.4G
Hz Rubber Ducky Antenna Reverse SMA Swivel
MHS031
120
2
dBi,
2.4G
Hz Rubber Ducky Antenna Reverse SMA Straight
MHS0311
21
2.5dBi
2.4 GHz
Rubber Ducky Antenna Reverse SMA Swivel
Yagi Antennas
MHS03
4100
9 dBi, 2.4GHz Yagi Directional Antenna RPTNC Pigtail
MHS03
4000
12 dBi, 2.4GHz Yagi Directional Antenna RPTNC Pigtail
MHS03
4120
14 dBi, 2.4GHz Yagi Directional Antenna RPTNC
Pigtail
MHS03
4150
14.5 dBi, 2.4GHz Yagi Directional Antenna RPTNC Pigtail
Patch Antennas
MHS03
4200
8 dBi, 2.4GHz Mini Flat Patch Directional Antenna RPTNC Pigtail
MHS034210
14 dBi, 2.4GHz Flat Patch Directional Antenna RPTNC Pigtail
Omni
Directional
MHS031
260
5 dBi, Omni Directional Antenna RPTNC Pigtail
MHS03
4000
6 dBi, 2.4GHz Omni Directional Antenna RPTNC Pigtail
MHS03
1340
8 dBi, Omni Directional Antenna RPTNC Pigtail
MHS03
4020
10.5 dBi, 2.4GHz Omni Directional
Antenna RPTNC Pigtail
MHS034030
12 dBi, 2.4GHz Omni Directional Antenna RPTNC Pigtail
MHS034040
15 dBi, 2.4GHz Omni Directional Antenna 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 UFL 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.
ISED Canada: This device has been designed to operate with the antennas listed above, and having a maximum gain of
15 dBi. Antennas not included in this list or having a gain greater than 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.
ISDE Canada: Cet appareil a été conçu pour fonctionner avec les antennes énumérées ci-dessus, et ayant un gain
maximal de 15 dBi. Antennes pas inclus dans cette liste ou présentant un gain supérieur à 15 dBi sont strictement
interdits pour une utilisation avec cet appareil. L'impédance d'antenne requise est de 50 ohms. Pour réduire les
interférences radio potentielles pour les autres utilisateurs, le type d'antenne et son gain doivent être choisis afin que la
puissance isotrope équivalente (PIRE) ne soit pas supérieure à celle requise pour une communication réussie rayonnée.
Cet appareil numérique de classe B est conforme à la norme ICES -003 du Canada.