IFHLYNXSP2A7575 MHz Remote Control Transmitter

1 CONTENTS INTRODUCTION LAY-OUT DIAGRAM FEATURES AND SPECS SETTING AND OPERATION 1. TRANSMITTER a. Loading batteries: b. Reading the LED Battery Indicators c. Recharging NiCad Batteries d. Transmitter Antenna e. Changing X-Tals 2. Installation of Receiver and Servos a. Using separate power source for the receiver b. Battery Eliminator Circuitry (B.E.C.) with Mechanical Speed Control c. Connection with Electronic Speed Control 3. Transmitter, Receiver and servo settings a. Checking operation of the servo - Steering Servo Settings - Steering servo trim setting b. Throttle Servo Settings - Using Mechanical Speed Control - Using electronic speed control - Using throttle servo for Gas powered vehicles 2 INTRODUCTION Thank you for purchasing the LYNX Sport 2 Channel FM Radio System. The LYNX Sport Radio is made of high quality, technically advanced components designed to achieve top performance from your RC vehicle. Team up with Hitec Racing and see that quality and performance doesn’t have to cost a fortune! LAY-OUT DIAGRAM (Illustration) 3 FEATURES AND SPECS * Pistol Grip 2 Channel AM Proportional System * Servo Reversing Switches (Both Channels) * 2 L.E.D. Battery Status Indicator * NiCad Battery Charging Jack * Power Output : 500mW * Current Drain : 180 mA SETTING AND OPERATION 1. TRANSMITTER a. Loading batteries: You may use either Alkaline or NiCad “AA” size batteries. * Push the bottom battery cover in the direction of the arrow then lift up the cover * Load 8 AA batteries (Be sure the polarity is correct) * Reinstall battery cover * NiCads should be charged with CG-25 charger for aproximately 12 hours before use b. Reading the LED Battery Indicators * Normal: Green * Warning: Flashing Red With new alkaline or freshly charged nicads the Green light should be brightly lit; as the green light starts to fade the Red begin illuminate and eventually light completely as the green light goes out. Once this occures, operation should be stopped immediately, and the batteries should be recharged or replaced. (Warning: Recharge nicads batteries only. Alkaline batteries can not be recharged) c. Recharging NiCad Batteries The LYNX Sport is equipped with an external charging jack so there is no need to remove the batteries from the transmitter to charge them. The Hitec CG-22 or 25A can be used to charge the batteries overnight, or for approximately 12-15 hours. Please refer to the following diagram, check to see that the charge lights lit after the connection is complete. d. Transmitter Antenna Always make sure your antenna is attached before use or you operating range will be greatly reduced and could result in damage to your vehicle and or injuries to yourself and others. e. Changing X-Tals Changing X-Tal to avoid conflicts with other vehicles is possible where permitted.(You must check your local rules before doing so. For example in the US the FCC prohibits the changing of transmitter X-Tals on 72 and 75mhz) . If you are eligible to change X-tals both the transmitter and receiver X-tals must be changed together. You must change within the same band, i.e. 75 MHz to 75 MHz , 27 MHz to 27 MHz, different bands can not be intermixed if your radio is on 75 MHz then 27 MHz X-tals cannot be used. Use only Hitec X-tal when changing frequencies. 4 2. Installation of Receiver and Servos a. Using separate power source for the receiver When using a separate power pack for the receiver instead of sharing the main power source for running , please refer to the following diagram. After installation, turn on the power to the transmitter first then turn the receiver on (Warning: Always turn the transmitter ON first and OFF last to prevent your vehical from running away.) This will prevent the receiver from picking up stray signals and going out of control. Now, move the controls to see if the servos are moving properly. If not, check your wiring or X-tals if the servos do not move at all. (Illustration) 3. Battery Eliminator Circuitry (B.E.C.) The Battery Eliminator Circuit allows the user to power the receiver from the main power source for the motor. Most cars that use B.E.C. will have a plug coming off the mechanical speed control. This plug is connected to the switch harness and then plugged directly in to the receiver Batt/BEC slot. (Warning control may be lossed as the battery dies and the voltage drops below the operating voltage of the reciever but still has enough power to sun the motor) To be safe do not run the motor battery completely dead, stop it as it starts to slow. 4. Connection with Electronic Speed Control Electronic Speed Control such as the Hitec HFX has a built in B.E.C. system inside the speed control circuit. Plug the receiver connector from the speed control into the “THROTTLE” or #2 channel on the receiver, and the steering servo into the “STEERING” or #1 channel on the receiver. Now you can connect the main power to the speed control and when the power switch is turned on the speed control will regulate the power that the receivers can use. 5 5. Transmitter, Receiver and servo settings Now we come to the critical part as proper installation of these three main components is essential. a. Checking operation of the servo * After installation of the servo and receiver into your model is complete, turn the power “ON” the transmitter (fully extend the antenna) now turn on the receiver. (It is advisable to remove the pinion gear from your car so that the wheels do not engage for this test) * Check to see if both servos and/or speed control are working properly. If not check the connections and/or make sure the main battery pack is charged. * Check to see if the servos are moving in the correct direction. If not, change the servo reversing switch located on the top of the transmitter to achieve the correct direction. * If everything checks out then turn the receiver “OFF” first, then the transmitter (Always remember Never have the receiver “ON” with out the transmitter being “ON” this means whe…

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ENGINEERING STATEMENT For Type Certification of Hitec RCD, Inc. Model: Lynx Sport AM 75 FCC ID: IFHLYNXSP2A75 I am an Electronics Engineer, a principal the firm of Hyak Laboratories, Inc., Springfield, Virginia. My education and experience are a matter of record with the Federal Communications Commission. Hyak Laboratories, Inc. has been authorized by Hitec RCD, Inc., to make type certification measurements on the Lynx Sport AM 75 transmitter. These tests were made by me or under my supervision in our Springfield laboratory. Test data and other documentation required by the FCC for type certification are included in this report. It is submitted that the above mentioned transmitter meets FCC requirements and type certification is requested. ______________________________ Rowland S. Johnson Dated: November 8, 1999 A. INTRODUCTION The following data are submitted in connection with this request for type certification of the Lynx Sport AM 75 transmitter in accordance with Part 2, Subpart J of the FCC Rules. The Lynx Sport AM 75 is a low power, non-voice, transmitter intended for remote control of model vehicles in the 75 MHz band. The equipment employs a vertical polarized antenna directly mounted on the unit and meets Paragraphs 95.645, 95.647, 95.649, and the technical requirements established in the Report & Order in PR Docket 90-222. B. GENERAL INFORMATION REQUIRED FOR TYPE CERTIFICATION (Paragraph 2.983 of the Rules) 1. Name of applicant: Hitec RCD, Inc. 2. Identification of equipment: IFHLYNXSP2A75 a. The equipment identification label is submitted as a separate exhibit. b. Photographs of the equipment are submitted as separate exhibits. 3. Quantity production is planned. 4. Technical description: a. 6k00A1D emission b. Frequency range: 75.41-75.99 MHz. c. Operating power of transmitter is fixed at the factory at 0.305 Watt. d. Maximum power permitted under Paragraph 95.635(b) of the FCC Rules is 750 milliwatts, and the Lynx Sport AM 75 fully complied with those power limi- tations. e. The dc voltage and dc currents at final amplifier: Collector voltage: 11.6 Vdc Collector current: 93 mA f. Function of each active semiconductor device: See Appendix 1. g. Complete schematic diagram is submitted as a separate exhibit. h. Draft instruction book is submitted as a separate exhibit. 2 B. GENERAL INFORMATION (continued) i. The transmitter tune-up procedure is submitted as a separate exhibit. j. A description of circuits for stabilizing frequency is included in Appendix 2. k. A description of circuits and devices employed for suppression of spurious radiation and for limiting modulation is included in Appendix 3. l. Not applicable. 5. Data for 2.985 through 2.997 follow this section. 6. RF_Power_Output (Paragraph 2.985(a) of the Rules) Since the Lynx Sport AM 75 has an immediately attached, integral antenna, no antenna port exists. Power was determined by calculation: P=(E+D) 2 (1) 30 G Where P = Power input (same as power radiated assuming 100% efficient antenna) E = Electric Field in V/M D = Distance in meters G = Gain of the antenna over isotropic. (For a 75 MHz monopole, gain = 0.8) P = (0.901571 x 3) 2 (from Table 1) 30 x 0.8 P = 0.305 watts (1) Kraus, J.D., Antennas p.55. 3 C. MODULATION CHARACTERISTICS Occupied_Bandwidth (Paragraphs 2.989(i), and 95.635(b) of the Rules) Figure 1 is a plot of the sideband envelope of the transmitter taken with an Tektronix 494P spectrum analyzer. Modulation corresponded to conditions of 2.989(i) and consisted of the multiple pulses and synchronizing space normally used in radio control applications. Operator controls were adjusted for worst-case emission. The plot is within the limits imposed by paragraph 95.635(c). The horizontal scale (frequency) is10kHz per division and the vertical scale (Amplitude) is a logarithmic presentation equal to 10 dB per division. Resolution bandwidth was 1 kHz; video bandwidth was 100 kHz. Figure 2 is a plot from a Tektronix 494P spectrum analyzer with 5 mS/division sweep in the time domain of the modulated carrier. Modulation consisted of two bursts with a nominal 2 mS duration at a nominal 60 Hz repetition rate. 4 FIGURE 1 OCCUPIED BANDWIDTH 95.635: (3) At least 25 dB on any frequency removed from the center of the authorized bandwidth by more than 50% up to and including 100% of the authorized bandwidth (4 to 8 kHz). (10) At least 45 dB on any frequency removed from the center of the authorized bandwidth by more than 100% up to and including 125% of the authorized bandwidth. (8 to 10 kHz) (11) At least 55 dB on any frequency removed from the center of the authorized bandwidth by more than 125% up to and including 250% of the authorized bandwidth. (10 to 20 kHz) (12) At least 56+10 log 10 (TP) dB on any frequency removed from the center of the authorized bandwidth by more than 250%. OCCUPIED BANDWIDTH FCC ID: IFHLYNXSP2A75 FIGURE 1 5 FIGURE 2 MODULATING WAVEFORM TIME DOMAIN 5 millisecond/division sweep OCCUPIED BANDWIDTH (Modulating Waveform) FCC ID: IFHLYNXSP2A75 FIGURE 2 6 D. SPURIOUS EMISSIONS AT THE ANTENNA TERMINALS (Paragraph 2.991 of the Rules) Since the Lynx Sport AM 75 transmitter meets FCC Rules 95.645, there are no provisions for antenna terminal output measurements. Substitution of a suitable matching network and retuning to permit observations at 50 ohms would not be representative of normal operation. Accordingly data on radiated spurious emissions are included in lieu of antenna terminal conducted spurious emissions. E. FIELD STRENGTH MEASUREMENTS OF SPURIOUS RADIATION (Paragraph 2.993(a) (b) (2) of the Rules) Field intensity measurements of radiated spurious emissions from the Lynx Sport AM 75 were made with a Tektronix 494P spectrum analyzer using EMCO 3121C calibrated test antennas. The transmitter and its integral vertical antenna were located in an open field 3 meters from the test antenna. Supply voltage was from a fresh set of batteries with a terminal voltage under load of 12.0 Vdc. The transmitter…

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