NKBTX3-9VAutomobile Race Management Transmitter

FCC ID: NKBTX3-9V Westhold Corporation TX3-9V Transmitter User Manual (Draft) Overview Thank you for selecting the Westhold TX3-9V transmitter. It is part of a sophisticated electronic timing and scoring system, the RMS-3. The lightweight and compact TX3-9V device operates on a standard 9 volt alkaline battery. It is easy to install, operate and maintain. Operation Directions TX3-9V Illustration The TX3-9V operates on a standard 9 volt alkaline battery. The battery can be inserted by first removing the small Phillips head screw and removing the battery compartment lid. Slide the battery into the compartment with the terminals of the battery coming in contact with the spring contacts as shown in the diagram below: It does not matter which battery terminal comes in contact with which spring contact. The TX3-9V will function with the battery in either orientation. Once the battery has been placed in the compartment, check to see that the green LED indicator light flashes. If the red LED light flashes, it indicates the battery is weak and therefore should be replaced. If both LED lights come on, remove the battery and reinstall the battery as per the instructions above. Place the battery lid back on the TX3-9V and screw down the lid. A fresh 9 volt battery will power the TX3-9V for 72+ hours. Battery Compartment Lid Low Battery LED(Red) Normal Operation LED(Green) TX3-9V Phillips Screw Spring Contacts FCC ID: NKBTX3-9V Installation Fasten the TX3-9V on the car or motorcycle using pop rivets or some other suitable fastening. Be sure to place all transmitters in the same location on each vehicle. The best possible orientation of the transmitter is shown below with the longest edge of the transmitter parallel to the Start/Finish line where the loop antenna is located. Maintenance The TX3-9V requires minimal maintenance. Cleaning the spring battery contacts can be done with a damp cloth or cotton swab. The external plastic may be cleaned with a damp cloth. Do not use solvents to clean either the plastic or the battery contacts. Specifications Specification Dimensions Approx. 3.25” x 2” x 0.75”(≈8x5x2cm) WeightApprox. 4oz(100 grams) Temp Range 32-122°F (0-50°C) Battery Life72 Hours Nominal(100 Typical) Operational IndicatorLED Low Battery IndicatorLED Humidity100% Relative FCC Notice FEDERAL COMMUNICATIONS COMMISSION RADIO AND TELEVISION INTERFERENCE STATEMENT Changes or modifications not expressly approved by Westhold Corporation could void the user's authority to operate the equipment. 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. FCC ID: NKBTX3-9V Direction of Travel

Nemko EESI, Inc. 11696 Sorrento Valley Road, Suite. F, San Diego, CA 92121 Phone (858) 793-9911 Fax (858) 259-7170 DATEDOCUMENT NAMEFCC IDPAGE 12/10/99Westhold Corporation Race Management System Block DiagramNKBTX3-9V1 of 1 Westhold Corporation111/26/99 TX3-9V Block Diagram NOR XOR Spiral Circuit Trace Antenna 10.24 MHz Quartz Crystal TXEN PHASE Microcontroller

May 4, 2001 Federal Communications Commission Equipment Authorization Branch 7435 Oakland Mills Road Columbia, MD 21046 Ref.:Westhold Corporation TX3-9V Race Management System Transmitter, FCC ID: NKBTX3-9V This notice is intended to clarify information provided in the 731 Form for the above referenced device. While the transmitter is a “composite device” and requires a receiver for normal operation, this receiver will be approved via the FCC’s Declaration of Conformity procedures. For this reason, the 731 Form indicates that the unit is not a composite device requiring more than one type of equipment authorization, and no additional equipment authorizations will be requested at this time. Thank you and please contact me with any questions. Sincerely, Andrew Smith Project Coordinator Nemko EESI, Inc.

Nemko EESI, Inc. 11696 Sorrento Valley Road, Suite. F, San Diego, CA 92121 Phone (858) 793-9911 Fax (858) 259-7170 DATEDOCUMENT NAMEFCC IDPAGE 12/10/99Westhold Corporation Race Management System Exterior PhotographsNKBTX3-9V1 of 2 EUT - Top View Nemko EESI, Inc. 11696 Sorrento Valley Road, Suite. F, San Diego, CA 92121 Phone (858) 793-9911 Fax (858) 259-7170 DATEDOCUMENT NAMEFCC IDPAGE 12/10/99Westhold Corporation Race Management System Exterior PhotographsNKBTX3-9V2 of 2 EUT – Bottom View

Nemko EESI, Inc. 11696 Sorrento Valley Road, Suite. F, San Diego, CA 92121 Phone (858) 793-9911 Fax (858) 259-7170 DATEDOCUMENT NAMEFCC IDPAGE 12/10/99Westhold Corporation Race Management System FCC Label Information NKBTX3-9V 1 of 1 Westhold Corporation111/26/99 FCC Label Location Diagram FCC Label Circuitry Lid 9 Volt Battery Lid Side View Top View Bottom View (Circuit side) The FCC label placement location is a recessed area designed specifically for such a label. The label content will read: FCC ID: NKBTX3-9V FCC ID: NKBTX3-9V

Nemko EESI, Inc. 11696 Sorrento Valley Road, Suite. F, San Diego, CA 92121 Phone (858) 793-9911 Fax (858) 259-7170 DATEDOCUMENT NAMEFCC IDPAGE 12/10/99Westhold Corporation Race Management System Interior PhotographsNKBTX3-9V1 of 4 EUT with Top Cover Off (Showing Bottom of PCB) Nemko EESI, Inc. 11696 Sorrento Valley Road, Suite. F, San Diego, CA 92121 Phone (858) 793-9911 Fax (858) 259-7170 DATEDOCUMENT NAMEFCC IDPAGE 12/10/99Westhold Corporation Race Management System Interior PhotographsNKBTX3-9V2 of 4 Component Side of PCB Nemko EESI, Inc. 11696 Sorrento Valley Road, Suite. F, San Diego, CA 92121 Phone (858) 793-9911 Fax (858) 259-7170 DATEDOCUMENT NAMEFCC IDPAGE 12/10/99Westhold Corporation Race Management System Interior PhotographsNKBTX3-9V3 of 4 Bottom Cover Removed (Showing 9V Battery) Nemko EESI, Inc. 11696 Sorrento Valley Road, Suite. F, San Diego, CA 92121 Phone (858) 793-9911 Fax (858) 259-7170 DATEDOCUMENT NAMEFCC IDPAGE 12/10/99Westhold Corporation Race Management System Interior PhotographsNKBTX3-9V4 of 4 Bottom View of EUT with Battery Removed

Nemko EESI, Inc. 11696 Sorrento Valley Road, Suite. F, San Diego, CA 92121 Phone (858) 793-9911 Fax (858) 259-7170 DATEDOCUMENT NAMEFCC IDPAGE 12/10/99Westhold Corporation Race Management System Operational Description NKBTX3-9V1 of 2 Westhold Corporation111/26/99 Operational Description: TX3-9V Figure 1: Generation 3 9V BPSK Transmitter simplified block diagram. Transmit Path: The carrier frequency is generated by a crystal tuned oscillator circuit, which is embedded within the microcontroller. A NOR gate is used to switch on and off the carrier frequency. Data is modulated onto the carrier through the XOR gate at 1.024 Mbits/s. When the PHASE input is high, the XOR gate inverts the input from the NOR gate, effectively shifting the output carrier phase 180 degrees. Likewise, when the PHASE input is low, the XOR gate buffers the input from the NOR gate resulting in 0 phase shift. The output of the XOR gate drives an RC tank circuit. The C (20 pF) is chosen to ac couple the output of the XOR gate, and to tune the circuit to 10.24 MHz resonance. The L is the fixed inductance of the spiral circuit trace. Antenna Types: As the antenna is part of the circuit card, no external antennas can be used with this transmitter (thus complying with FCC Section 15.203 requirements). Theory of Operation: The transmitter signal uses Differential Binary Phase Shift Keying (BPSK) modulation. A phase shift of 90 degrees or more is interrupted as a logic 1, while a phase shift of less than 90 degrees is interrupted as a logic 0. Data is sent in packets of 75 bits or less, in frames of 1 ms in duration. Only one data packet may be sent per frame. Data is transmitted at a fixed rate of 1,024,000 bits per second. So this results in a maximum transmit duty cycle of 7.5%, or a maximum data throughput of 75,000 bits per second. NOR XOR Spiral Circuit Trace Antenna 10.24 MHz Quartz Crystal TXEN PHASE Microcontroller Nemko EESI, Inc. 11696 Sorrento Valley Road, Suite. F, San Diego, CA 92121 Phone (858) 793-9911 Fax (858) 259-7170 DATEDOCUMENT NAMEFCC IDPAGE 12/10/99Westhold Corporation Race Management System Operational Description NKBTX3-9V2 of 2 Westhold Corporation211/26/99 Mode of Operation During Testing Only one mode of operation exists for the Westhold TX3-9V transmitter. The following describes the test mode: During testing the transmitter used a Differential Binary Phase Shift Keying (BPSK) modulation. A phase shift of 90 degrees or more is interrupted as a logic 1, while a phase shift of less than 90 degrees is interrupted as a logic 0. Data was sent in packets of 75 bits or less, in frames of 1 ms in duration. Only one data packet was sent per frame. Data was transmitted at a fixed rate of 1,024,000 bits per second. This resulted in a maximum transmit duty cycle of 7.5%, or a maximum data throughput of 75,000 bits per second.

Transmitters The transmitters are light, compact devises attached to each vehicle. Each transmitter is assigned a unique identification number to differentiate individual vehicles. As the vehicle passes over the Loop Antenna, the Decoder reads this identification number and determines a crossing time. The information is then sent digitally via the RaceBus to the IDU. The transmitters have convenient LED indicators for operational status. A green LED indicates the transmitter is working. A red LED indicates a low battery condition. There is no guesswork involved in determining battery status. During a race the transmitter is also capable of relaying a low battery status to the Race Management System and informing the system operator of this condition. Specification Dimensions Approx. 3.25” x 2” x 0.75”(≈8x5x2cm) WeightApprox. 4oz(100 grams) Temp Range 32-122°F (0-50°C) Battery Life72 Hours Nominal(100 Typical) Operational IndicatorLED Low Battery IndicatorLED Humidity100% Relative * Specifications subject to change 4441 Huggins Street, San Diego, CA 92122 800-346-3633, 858-554-0061, fax:858-558-4706 www.westhold.com Westhold Westhold