MRX-GMXFM315Remote Tire Pressure Sensor

Re: Certification for Schrader GMXFM315 Transmitter Model: GMXFM315 FCC ID: MRX-GMXFM315 IC: 2546A-GMXFM315 USER'S MANUAL INFORMATION (PRELIMINARY) The User's Manual is in preparation. The following material will be contained in the manual: FCC ID: MRX-GMXFM315 IC: 2546A-GMXFM315 This device complies with Part 15 of the FCC Rules and with RSS-210 of Industry Canada. 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 expressively approved by the party responsible for compliance could void the user's authority to operate the equipment. The term “IC:” before the radio certification number only signifies that Industry Canada technical specifications were met.

Page 2 of 3 ROLL RF CIRCUIT ASIC 3V LITHIUM BATTERY VALVE LEARN PRESSURE SENSOR Fig.1

Re: Certification for Schrader GMXFM315 Transmitter Model: GMXFM315 FCC ID: MRX-GMXFM315 IC: 2546A-GMXFM315 REQUEST FOR CONFIDENTIALITY Pursuant to 47 CRF 0.459, Schrader requests that a part of the subject application be held confidential. This comprises Exhibits (5) Schematics (10) Parts List (Part of Exhibit only) Schrader has spent substantial effort in developing this product and it is one of the first of its kind in industry. Having the subject information easily available to "competition" would negate the advantage they have achieved by developing this product. Not protecting the details of the design will result in financial hardship. If there are any questions regarding this request, please contact me at the above address or call 734-483-4211, fax 734-647-2106 or e-mail [email protected]. Sincerely, Valdis V. Liepa Research Scientist University of Michigan January 8, 2003 Re: Certification for Schrader GMXFM315 Transmitter Model: GMXFM315 FCC ID: MRX-GMXFM315 IC: 2546A-GMXFM315 STATEMENT OF MODIFICATIONS There were no modifications made to the DUT by this test laboratory. (Also see Section 3.1 of the attached Test Report). _____________________ Valdis V. Liepa Research Scientist Re: Certification for Schrader GMXFM315 Transmitter Model: GMXFM315 FCC ID: MRX-GMXFM315 IC: 2546A-GMXFM315 GENERAL PRODUCT INFORMATION The device, for which certification is pursued, has been designed by: Schrader Electronics Limited 2546A-GMXFM315 11 Technology Park, Belfast Road Antrim BT41 1QS, Northern Ireland Gerard Heatly Tel: 011-44-28-9446-1300 Fax: 011-44-18-4946-8440 It will be manufactured by: Schrader Electronics Limited 11 Technology Park, Belfast Road Antrim BT41 1QS, Northern Ireland Gerard Heatly Tel: 011-44-28-9446-1300 Fax: 011-44-18-4946-8440 Canadian Contact: Gates Rubber Co. 3303 Saint Etienne Boulevard Windsor, Ontario N8W 5B1 Contact: Karen McNamara +1 313 962-1711 ext. 250 Re: Certification for Schrader GMXFM315 Transmitter Model: GMXFM315 FCC ID: MRX-GMXFM315 IC: 2546A-GMXFM315 POWER OF ATTORNEY A letter granting Valdis V. Liepa the Power of Attorney is on file and can be provided when so requested.

RE: Schrader Electronics Limited FCC ID: MRX-GMXFM315 The following is in response to the comments made on the above application 1) The operational description states on page one that 1 transmission occurs per minute, while on page 2 it states that a transmission occurs every 32 seconds. Please comment and correct this exhibit. The exhibit has been corrected. The transmission occurs every 32 seconds. 2) The parts list and board layout appear to be for a different version of the device. Please explain or correct. The parts list and layout are correct for the device. We have re-uploaded the file incase there was a mistake in uploading earlier. 3) The EUT was tested to 3.15 GHz, but the test equipment list does not show what antenna was used > 1 GHz. The Ridge Horn Antenna was used. A revised test report has been uploaded. 4) The list of operational modes references a letter regarding the Alarm mode, which is not provided. Please comment. The description of operation has been updated. Please see exhibit.

American Telecommunications Certification Body Inc. 6731 Whittier Ave, McLean, VA 22101 January 8, 2003 RE: Schrader Electronics Limited FCC ID: MRX-GMXFM315 After a review of the submitted information, I have a few comments on the above referenced Application. 1) The operational description states on page one that 1 transmission occurs per minute, while on page 2 it states that a transmission occurs every 32 seconds. Please comment and correct this exhibit. 2) The parts list and board layout appear to be for a different version of the device. Please explain or correct. 3) The EUT was tested to 3.15 GHz, but the test equipment list does not show what antenna was used > 1 GHz. 4) The list of operational modes references a letter regarding the Alarm mode, which is not provided. Please comment. Timothy R. Johnson Examining Engineer mailto: [email protected] The items indicated above must be submitted before processing can continue on the above referenced application. Failure to provide the requested information may result in application termination. Correspondence should be considered part of the permanent submission and may be viewed from the Internet after a Grant of Equipment Authorization is issued. Please do not respond to this correspondence using the email reply button. In order for your response to be processed expeditiously, you must submit your documents through the AmericanTCB.com website. Also, please note that partial responses increase processing time and should not be submitted. Any questions about the content of this correspondence should be directed to the sender.

GMX215 FCC Submission – Technical Descrption Prepared by G. Heatley 27-Nov-02 Filename: FCC - Technical Description incl. Block diagram.doc Page Technical Description of the transmitter type designation : GM10306573 Brief Description A block diagram of the RTPMS2 is shown in figure 1. The transmitter has the following sections: - RF circuit - Pressure sensor - roll switch - Magnet-learn Switch (reed switch) - ASIC The system has been developed to monitor a vehicle's tyre pressures whilst driving or stationary. An electronic unit inside each tyre, (referred to as the RTPMS2 transmitter) mounted to the valve stem, periodically measures actual tyre pressure. By means of RF communication, this pressure information is transmitted to a receiver/decoder which is fitted in the car. The tire pressure value is detected by the ASIC (Application Specific Integrated Circuit) via a pressure sensor. The data is transmitted using a Manchester coding protocol at a maximum data rate of 4.096 Kbits/sec. The clock generator for the ASIC is crystal controlled. The block transmission format is shown in figure 2. The valve stem is part of the transmitting antenna. while the vehicle is parked (Stationary Mode), there is no transmission. when the vehicle is moving (roll switch closed) the RTPMS2 transmits 8 words every 32 sec as shown in figure 2. The transmitter will remain in drive mode for a period of time known as the Service Period after the vehicle comes to rest (roll switch open). After the Service Period time has elapsed the transmitter returns to Stationary Mode. The RTPMS2 uses a Reed Switch, which when magnetically activated, will learn the ID code to the receiver/decoder in the production line of the vehicles. MRX-GMXFM315 Consumer Use Modes Manufacturing & Service Modes Mode of OperationExplanationFrequency of Transmission X Roll Mode (Drive mode)Transmitter in normal operation - wheel is rotating and roll switch is closed8 words every 32 seconds X Learn Mode Transmits 40 words after magnetic or LF transponder activation or when sensor exits Off mode due to Roll switch closure 40 words for 1 transmission, < 5secs X Factory Mode. Transmitter is in Factory mode for the next 16 or fewer Roll Switch closures after a Learn activation. The Wheel has to be rotating (roll switch closed) 8 words every 10 seconds. XX Stationary Mode Transmitter enters mode after Factory Mode or Drive Mode - Wheel is not rotating - Vehicle is stopped. no transmission X Wake Mode Transmit 8 words when sensor transitions from Stationary mode to Drive mode due to Roll switch closure 8 words for 1 transmission XX Off ModeTransmit 8 words when sensor transitions to Off mode8 words for 1 transmission X Low Battery Mode X Re-measure Mode XX Sleep ModeAll of the time between the other modesno transmission Notes: 3) 8 word packet is < 1sec in duration Pursuant to Section 15.231(a)(4), alarm conditions apply for these two modes as they occur only during sudden change in tire pressure or at the time of low battery, per conversations with FCC. 1) The manufacturing and service modes fall under FCC Part 2.803(d),2.803(e)(1)(iv),(v), and 2.803(e)(2). These modes are used to setup and program the tire pressure monitoring system on the vehicle and will be used in factory and service environments (i.e. vehicle/tire dealers) only. Since these procedures require special equipment and training, they will not be evoked by the consumer. 2) Power levels of all transmissions are the same Page 3 of 3 6 x 25 ms B = 0.15 s 8 words ( 1 block) < 32 seconds 18 Bits of Start 3 Bits 24 Bits 8 Bits 2 Bits 1 Word or Frame width = 13.4 ms ± 1% B Fig.2