Operating Manual MHX2421 2400 MHz Spread Spectrum OEM Transceiver Revision 0.30, March 5, 2007 Microhard Systems Inc. #17, 2135 – 32nd Ave N.E. Calgary, Alberta T3K 4Z4 Phone: (403) 248-0028 Fax: (403) 248-2762 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.
MHX2421 Regulatory Requirements PLEASE READ THIS SECTION CAREFULLY WARNING: To satisfy FCC RF exposure requirements for both base and mobile 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.
Contents Warranty ....................................................................................................................................................................... ii Warranty Diclaims........................................................................................................................................................ ii Indemnification.......................................................................................................................................
2. General 2.0 Product Overview The MHX2421 is a high-performance embedded wireless data transceiver. Operating in the 2400 - 2483.5 MHz ISM band, this a spread-spectrum module is capable of providing reliable wireless data transfer between almost any type of equipment. 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 MHX2421 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.
MHX2421 Operating Manual: Chapter2 General 3
3. Installation 3.0 Overview Qualified and experienced personnel must carry out the installation, removal or maintenance of all antenna components. The MHX2421 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 MHX2421 module. 3.
Figure 1 Gain Calculation The power level has been set to 30dBm (1W) on the transmitter, and the receiver sensitivity for the MHX2421 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 MHX2421 module. 3.2.
3.2.2 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.
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.
Examples: FCC and Industry Canada Regulations allow up to 36dBm equivalent 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 Group 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 MHS031270 3dBi, 2.4GHz Transit Antenna Magnetic Mount with Ground Plane MHS031290 3dBi, 2.4GHz Transit Antenna Permanent Mount with Ground Plane MHS034300 3 dBi, 2.
