HTWTFA110ACycle Computer (Transmitter)

FCC ID:HTWTFA110A 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 interference received, including interference that may cause undesired operation. WARNING: Charges or modifications to this unit not expressly approved by the party responsible for compliance could void the user’s authority to operate the equipment. NOTE: 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. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures: ® Reorient or relocate the receiving antenna. ® Increase the separation between the equipment and receiver. ® Connect the equipment into an outlet on a circuit different from that to which the receiver is connected. ® Consult the dealer or an experienced radio /TV technician for help. WARNING: To minimize or prevent any interference, the computer should be placed away from the any cordless phones, TVs or any other places where intensive electromagnetic wave or field exist. If interference is experienced, moving the computer farther away from the interference-emitted devices will often reduce or eliminate the interference.

Test SetupFCCID : HTWTFA110A External Photo -front External Photo - rear

Test SetupFCCID : HTWTFA110A Internal Photo - 1 Internal Photo - 2

TECHNICAL DESCRIPTION OF MODEL 3 CYCLE COMPUTER Transmitter Circuit Signal Pick-upMagnetic Reed Switch T1 Pulse GenerationSquare wave signaling after a single magnetic reed switch engagement, U1-A and U1-B. Carrier Generation18kHz generated by C4, R8 and R4. Electrical SwitchingPerformed by U2-A, U2-B, U2-C and U2-D, feedback to pulse generator for signal switching. Signal TransmissionThe 20mm coil antenna T1 transmits square signals modulated by 18kHz carrier. Reception Circuit Signal ReceptionThe 10mm coil antenna T3 receives the modulated signal transmitted by T1. Signal DemodulationC9, CC9 demodulates the 18kHz carrier. Signal Pre-amplificationCascaded amplifiers connected by Q2 to Q7 demodulated signal amplification. Square Wave AmplificationAn amplified pure square recovered by the U3 and send to CPU for signal pick-up. Main Circuit CPUSpeed and Clock calculation. LCDFeature and artwork display. BacklightHigh voltage boost up by BT6802-2 (U4)

Same Time Electronics Limited Application For Certification (FCC ID: HTWTFA110A) Transmitter WO# 0110069 WL/Agnes October 10, 2001 INTERTEK TESTING SERVICES FCC ID: HTWTFA110A i LIST OF EXHIBITS INTRODUCTION EXHIBIT 1 :General Description EXHIBIT 2 :System Test Configuration EXHIBIT 3 :Emission Results EXHIBIT 4 :Equipment Photographs EXHIBIT 5 :Product Labelling EXHIBIT 6 :Technical Specifications EXHIBIT 7 :Instruction Manual EXHIBIT 8 :Miscellaneous Information INTERTEK TESTING SERVICES FCC ID: HTWTFA110A ii MEASUREMENT/TECHNICAL REPORT Same Time Electronics Limited - MODEL: A110 FCC ID: HTWTFA110A October 10, 2001 This report concerns (check one:)Original Grant X Class II Change Equipment Type: Low Power Transmitter (example: computer, printer, modem, etc.) Deferred grant requested per 47 CFR 0.457(d)(1)(ii)?Yes No X If yes, defer until: date Company Name agrees to notify the Commission by: date of the intended date of announcement of the product so that the grant can be issued on that date. Transition Rules Request per 15.37?Yes No X If no, assumed Part 15, Subpart C for intentional radiator - the new 47 CFR [5-24-01 Edition] provision. Report prepared by:Wilson Loke Intertek Testing Services 2/F., Garment Center, 576, Castle Peak Road, HONG KONG Phone: 852-2173-8575 Fax:852-2745-8306 INTERTEK TESTING SERVICES FCC ID: HTWTFA110A iii Table of Contents 1.0 General Description................................................................................................................ 2 1.1 Product Description ............................................................................................................... 2 1.2 Related Submittal(s) Grants ................................................................................................... 2 1.3 Test Methodology .................................................................................................................. 3 1.4 Test Facility............................................................................................................................ 3 2.0 System Test Configuration...................................................................................................... 5 2.1 Justification ............................................................................................................................ 5 2.2 EUT Exercising Software ....................................................................................................... 5 2.3 Special Accessories ................................................................................................................ 5 2.4 Equipment Modification ........................................................................................................ 6 2.5 Support Equipment List and Description ............................................................................... 6 3.0 Emission Results...................................................................................................................... 8 3.1 Field Strength Calculation ...................................................................................................... 9 3.2 Radiated Emission Configuration Photograph ..................................................................... 11 3.3 Radiated Emission Data ....................................................................................................... 12 4.0 Equipment Photographs....................................................................................................... 17 5.0 Product Labelling.................................................................................................................. 19 6.0 Technical Specifications........................................................................................................ 21 7.0 Instruction Manual................................................................................................................ 23 8.0 Miscellaneous Information................................................................................................... 25 8.1 Emissions Test Procedures...................................................................................................26 INTERTEK TESTING SERVICES FCC ID: HTWTFA110A iv List of attached file Exhibit typeFile Descriptionfilename Test ReportTest Reportreport.doc Operation DescriptionTechnical Descriptiondescri.pdf Test Setup PhotoRadiated EmissionRconfig photos.doc External PhotoExternal Photoexternal photos.doc Internal PhotoInternal Photointernal photos.doc Block DiagramBlock Diagramblock.pdf SchematicsCircuit Diagramcircuit.pdf ID Label/LocationLabel Artwork and Locationlabel.pdf User ManualUser Manualmanual.pdf INTERTEK TESTING SERVICES FCC ID: HTWTFA110A 1 EXHIBIT 1 GENERAL DESCRIPTION INTERTEK TESTING SERVICES FCC ID: HTWTFA110A 2 1.0General Description 1.1Product Description The Equipment Under Test (EUT) is a Wireless Cycle Computer Transmitter operating at 18kHz. The EUT is powered by 3V d.c. (1x3V “CR2032” lithium cell). In normal use, it is attached to the left fork blade by Quick Ties using rubber shims to adjust to the diameter of the fork. The EUT will detect the rate of change of the magnetic flux generated by the magnet clamped on the front wheel spoke and transmit the speed information to the receiver. For electronic filing, the brief circuit description is saved with filename: descri.pdf 1.2Related Submittal(s) Grants This is a single application for certification of a transmitter. INTERTEK TESTING SERVICES FCC ID: HTWTFA110A 3 1.3Test Methodology Radiated emission measurements were performed according to the procedures in ANSI C63.4 (1992). All measurements were performed in Open Area Test Sites. Preliminary scans were performed in the Open Area Test Sites only to determine worst case modes. For each scan, the procedure for maximizing emissions in Appendices D and E were followed. All Radiated tests were performed at an antenna to EUT distance of 3 met…

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Test SetupFCCID : HTWTFA110A Radiated -front Radiated - rear