Operating Manual pDDL900 1W Dual Frequency 900MHz/2.4GHz Digital Data Link Revision 0.35, April 11, 2017 Microhard Systems Inc. www.microhardcorp.
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.
pDDL900 Regulatory Requirements - PLEASE READ THIS SECTION CAREFULLY WARNING: To satisfy FCC/IC RF exposure requirements for mobile transmitting devices, a separation distance of 36 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.
pDDL900 Exigences Réglementaires WARNING: Pour satisfaire aux exigences de la FCC/IC d'exposition RF pour la base et mobiles sur une distance de séparation de 36 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.
Federal Communication Commission Interference Statement 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.
Co-Location with Cellular Modems FCC: The maximum calculated MPE ratio for the EUT with 2.5 dBi dipole antenna is 0.398 (evaluated at 36 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 - 0.398 < 0.602.
Contents Warranty ....................................................................................................................................................................... ii Proprietary Rights ......................................................................................................................................................... ii pDDL900 Regulatory Requirements ...................................................................................................................
2. General 2.0 Product Overview The pDDL900 is a high-performance embedded wireless data transceiver. Operating in the 902 - 928 MHz and 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.
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 pDDL900 is to provide a short- to midrange 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.
3. Installation 3.0 Overview The pDDL900 complies with FCC part 15 at the modular level for operation in the license-free 902-928 MHz and 2400-2483.5 MHz ISM band. This chapter provides guidelines for installing and deploying equipment which incorporates the pDDL900 module. 3.
Figure 1 Gain Calculation The power level has been set to 30dBm (1W) on the transmitter, and the receiver sensitivity for the pDDL900 is -108dBm. System gain would be calculated to be: 30 - 2 + 6 + 3 - 2 + 108 = 143 dB.
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 pDDL900 module. 3.2.
3.2.2 WARNING: To satisfy FCC/IC RF exposure requirements for mobile transmitting devices, a separation distance of 36 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: 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 pDDL900 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.
Examples: FCC and ISED 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.
A. Approved Antennas This radio transmitter (IC: 3143A-17PDDL900) has been approved by ISED 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. 2400MHz antennas: Group Part Number Description MHS031100 2dBi,2.4GHz Rubber Ducky Antenna RPTNC Swivel MHS031110 2dBi, 2.
900MHz antennas: 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 MHS031210 3dBi, 900 MHz Transit Antenna with Ground Plane MHS031220 3dBi, 900MHz Transit Antenna No Ground Plane MHS031230 3dBi, 900MHz Transit Antenna Permanent Mount GP MHS031240 3dBi, 900MHz Transit Antenna Permanent Mount NGP Transit Antennas Mo
