Microhard Systems 16PDDL2450 Pico 2.4GHz 1W Digital Data Link Module User Manual Operating Manual

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Document ID	2962617
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Document Description	Operating Manual
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Document Type	User Manual
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Date Submitted	2016-04-19 00:00:00
Date Available	2016-04-19 00:00:00
Creation Date	2016-04-12 11:07:48
Document Lastmod	2016-04-12 14:07:08
Document Title	Operating Manual
Document Author:	llei

Operating Manual
pDDL2450
Pico 2.4GHz 1W Digital Data Link Module
Revision 0.35, April 12, 2016
Microhard Systems Inc.
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
PDDL2450 Operating Manual
pDDL2450 Regulatory Requirements - PLEASE READ THIS SECTION
CAREFULLY
WARNING:
To satisfy FCC RF exposure requirements for mobile transmitting devices, a separation distance of 23 cm or more should be maintained
between the antenna of this device and persons during device operation. To ensure compliance, operations at closer than this distance is
not recommended. The antenna used for this transmitter must not be co-located in conjunction with any other antenna or transmitter.
To satisfy IC RF exposure requirements for mobile transmitting devices, a separation distance of 25 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 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 (emissio ns).
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 complies with Industry Canada’s license-exempt RSSs. Operation is subject to the following two conditions:
(1) This device may not cause interference; and (2) This device must accept any interference, including interference that may cause
undesired operation of the device.
SAMPLE LABEL REQUIREMENT for Model: pDDL2450:
Contains:
FCC ID: NS916PDDL2450
IC : 3143A-16PDDL2450
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
pDDL2450 Exigences Réglementaires
WARNING:
Pour satisfaire aux exigences de la FCC d'exposition RF pour la base et mobiles sur une distance de séparation de 23 cm ou plus doit
être maintenue entre l'antenne de cet appareil et des personnes lors de fonctionnement du dispositif. Pour assurer la conformité des
opérations au plus près que cette distance n'est pas recommandée. L'antenne utilisée pour ce transmetteur ne doit pas être colocalisés en conjonction avec toute autre antenne ou transmetteur.
Pour satisfaire aux exigences de la IC d'exposition RF pour la base et mobiles sur une distance de séparation de 25 cm ou plus doit
être maintenue entre l'antenne de cet appareil et des personnes lors de fonctionnement du dispositif. Pour assurer la conformité des
opérations au plus près que cette distance n'est pas recommandée. L'antenne utilisée pour ce transmetteur ne doit pas être colocalisés en conjonction avec toute autre antenne ou transmetteur.
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 ante nnes
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 EIRP
Règlement FCC permettent jusqu'à 36 dBm puissance isotrope rayonnée équivalente (EIRP) . 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:
Cet appareil est conforme aux CNR exempts de licence d'Industrie Canada . Son fonctionnement est soumis aux deux conditions
suivantes : ( 1 ) Ce dispositif ne peut causer des interférences ; et ( 2 ) Ce dispositif doit accepter toute interférence , y compris les
interférences qui peuvent causer un mauvais fonctionnement de l'appareil.
SAMPLE LABEL REQUIREMENT for Model: pDDL2450:
Contains:
FCC ID: NS916PDDL2450
IC : 3143A-16PDDL2450
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 .
iv
PDDL2450 Operating Manual
Co-Location with Cellular Modems
FCC: The maximum calculated MPE ratio for the EUT with 2 dBi dipole antenna is 0.238 (evaluated at 23 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 - 0.238 < 0.762. The following co-location
were evaluated for mobile configurations:
Industry Canada: The maximum calculated MPE ratio for the EUT with 2 dBi dipole antenna is 0.230 (evaluated at
32 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 - 0.230 < 0.770. The following co-location
were evaluated for mobile configurations:
1) EUT with 2 dBi dipole antenna co-located with Data Card Module
(FCC ID RI7LN930, IC: 5131A-LN930)
2) EUT with 2 dBi dipole antenna co- located with LTE Data Transmitter Module
( FCC ID R5QTOBYL201 , IC 8595B – TOBYL201 )
3) EUT with 2 dBi dipole antenna co- located with GSM/UMTS/LTE Data Module
( FCC ID RI7LE910NAV2, IC - 5131A-LE910NAV2 )
Co - localisation avec Cellular Modem
FCC : Le maximum calculé rapport EMT pour l'EST avec antenne dipôle 2 dBi est de 0,238 (évalué à 23 cm), cette
configuration peut être co- située avec d'autres antennes à condition que la somme des rapports MPE pour tous les
autres antennes de transmission simultanées incorporés dans un dispositif hôte est < 1,0 à 0,238 < 0,762 . Le coemplacement suivant ont été évalués pour les configurations mobiles :
Industry Canada : Le maximum calculé rapport EMT pour l'EST avec antenne dipôle 2 dBi est de 0,230 (évalué à 32
cm), cette configuration peut être co- située avec d'autres antennes à condition que la somme des rapports MPE pour
tous les autres antennes de transmission simultanées incorporés dans un dispositif hôte est < 1.0 - 0.230 < 0.770. Le
co- emplacement suivant ont été évalués pour les configurations mobiles :
1 ) EUT avec 2 dBi antenne dipôle co-localisé avec module de carte de données
( FCC ID RI7LN930 , IC : 5131A - LN930)
2 ) EUT avec 2 dBi antenne dipôle co- localisé avec LTE données Module émetteur
( FCC ID R5QTOBYL201 , IC 8595B – TOBYL201 )
3 ) EUT avec 2 dBi antenne dipôle situé coopération avec les réseaux GSM / UMTS / LTE du module de
données ( FCC ID RI7LE910NAV2, IC - 5131A-LE910NAV2 )
Contents
Warranty ................................................................................................................................................................ ii
Proprietary Rights .................................................................................................................................................. ii
pDDL2450 Regulatory Requirements ................................................................................................................... iii
pDDL2450 Exigences Réglementaires ................................................................................................................... iv
Co-Location Instructions ........................................................................................................................................ v
2.
GENERAL .................................................................................................................................................... 1
2.0
2.1
3.
INSTALLATION.......................................................................................................................................... 3
3.0
3.1
3.2
3.2.1
3.2.2
vi
PRODUCT OVERVIEW ................................................................................................................................................ 1
OUTPUT POWER LEVEL ............................................................................................................................................. 2
OVERVIEW ............................................................................................................................................................... 3
ESTIMATING THE GAIN MARGIN ................................................................................................................................ 3
ANTENNAS AND CABLING ......................................................................................................................................... 5
Internal Cabling ............................................................................................................................... 5
Installing External Cables, Antennas and Lightning Arrestors ........................................................... 6
PDDL2450 Operating Manual
2. General
2.0 Product Overview
The pDDL2450 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 pDDL2450 modules can link two terminal devices (“pointto-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 pDDL2450 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 pDDL2450 to interface directly to any
equipment with an asynchronous serial interface.
 ease of installation and use – the pDDL2450 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.
2400-2483.5 MHz, which is license-free within North America; may need to be factoryconfigured differently for some countries.
 TDMA (time division multiple access) support, allowing
multi-slave access in point-to-point mode.
 roaming ability, allowing repeaters and slaves to resynchronize with a new master if the synchronization pulse
from the original master is lost.
While the typical application for the pDDL2450 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 pDDL2450
transmits. The pDDL2450’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)
20
21
22
23
24
25
26
27
28
29
30
Approx. Output Power
(mW)
100
125
160
200
250
320
400
500
630
800
1000
3. Installation
3.0 Overview
The pDDL2450 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 pDDL2450 module.
3.1 Estimating the Gain Margin
Successful communication between pDDL2450 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 pDDL2450 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 pDDL2450 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
Antenna Gain = 6 dB
Chapter3 Installation
Cable Loss = 2 dB
Antenna Gain = 3 dB
Transmitter
Receiver
30 dBm
Output Power
Sensitivity =
-105 dBm
Figure 1 Gain Calculation
The power level has been set to 30dBm (1W) on the transmitter, and the
receiver sensitivity for the pDDL2450 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
(km)
Base Height
(m)
Mobile Height
(m)
Path Loss
(dB)
15
2.5
116.5
30
2.5
110.9
15
2.5
124.1
15
117.7
15
10
105
16
15
2.5
135.3
16
15
128.9
16
15
10
116.2
16
30
10
109.6
16
30
122.4
16
30
2.5
128.8
pDDL2450 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 pDDL2450 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.
Reverse TNC Connector
RG316 Cable
with UFL
connector
and Reverse TNC
bulkhead
connector
PDDL24
50
UFL connector
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.
pDDL2450 Operating Manual
3.2.2 Installing External Cables, Antennas and Lightning
Arrestors
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.
Never work on an antenna system when there is lightning in the area.
Direct human contact with the antenna is potentially unhealthy when the
pDDL2450 is generating RF energy. Always ensure that the pDDL2450
equipment is powered down during installation. At all times a distance of
23 cm (25 cm for IC) 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
WARNING:
To satisfy IC 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.
Although the pDDL2450 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
pDDL2450 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:
WARNING:
Direct human contact with the
antenna is potentially unhealthy
when the pDDL2450 is
generating RF energy. Always
ensure that the pDDL2450
equipment is powered down
during installation.
WARNING:
Never work on an antenna
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.
pDDL2450 Operating Manual
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 pDDL2450 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 nonconductive, 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 pDDL2450 radio modem. If you require another type of antenna
please contact Microhard Systems Inc. The pDDL2450 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
pDDL2450 Operating Manual
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
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 pDDL2450 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 pDDL2450 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 pDDL2450 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
pDDL2450 Operating Manual
A. Approved Antennas
This radio transmitter (IC:3143A-16PDDL2450) has been approved by Industry Canada to operate with the antenna
types listed below with the maximum permissible gain indicated. Antenna types not included in this list, having a gain
greater than the maximum gain indicated for that type, are strictly prohibited for use with this device.
Cet émetteur radio ( IC : 3143A - 16PDDL2450) a été approuvé par Industrie Canada pour fonctionner avec les types
d'antenne énumérés ci-dessous avec le gain maximal admissible indiqué . Types d'antennes ne figurant pas dans cette
liste, ayant un gain supérieur au gain maximum indiqué pour ce type, sont strictement interdits pour une utilisation avec
cet appareil.
Part Number
Description
MHS031100
2dBi,2.4GHz Rubber Ducky Antenna RPTNC Swivel
MHS031110
2dBi, 2.4GHz Rubber Ducky Antenna Reverse SMA Swivel
MHS031120
2dBi, 2.4GHz Rubber Ducky Antenna Reverse SMA Straight
MHS034100
9 dBi, 2.4GHz Yagi Directional Antenna RPTNC Pigtail
MHS034000
12 dBi, 2.4GHz Yagi Directional Antenna RPTNC Pigtail
MHS034120
14 dBi, 2.4GHz Yagi Directional Antenna RPTNC Pigtail
MHS034150
14.5 dBi, 2.4GHz Yagi Directional Antenna RPTNC Pigtail
MHS034200
8 dBi, 2.4GHz Mini Flat Patch Directional Antenna RPTNC Pigtail
MHS034210
14 dBi, 2.4GHz Flat Patch Directional Antenna RPTNC Pigtail
MHS031260
5 dBi, Omni Directional Antenna RPTNC Pigtail
MHS034000
6 dBi, 2.4GHz Omni Directional Antenna RPTNC Pigtail
MHS031340
8 dBi, Omni Directional Antenna RPTNC Pigtail
MHS034020
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
Rubber Ducky
Yagi Antennas
Patch Antennas
Omni Directional
WARNING:
Changes or modifications not expressly approved by Microhard Systems Inc. could void the user’s authority to operate the equi pment.
This device has been tested with UFL connectors with the antennas listed in Appendix A When integrated in OEM products, fixe d
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 Cont act
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 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.
Industrie 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.
pDDL2450 Operating Manual

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