BRWXF631XF631 6 Channel FM Radio System

6-CHANNEL COMPUTER RADIO 3 XF631 MANUAL • Table of Contents QUICK START4 I. INTRODUCTION 1. Using This Manual6 2. Features6 2.1 Transmitter Features6 2.2 Receiver Features6 2.3Servo Features7 2.4Servo Layout7 3. Specifications8 3.1 System Specifications8 3.2 Transmitter Specifications8 3.3 Servo Specifications8 3.4 Receiver Specifications9 3.5 Charger Specifications9 3.6 Airborne Battery Pack9 4. Battery Charging10 4.1 Transmitter/Receiver10 4.2 Charger10 5. Trainer System11 II. XF631 MANUAL 1. Transmitter Controls12 1.1 Control Identification and Location12 1.2 Receiver Channel Assignment/ Transmitter Throttle ALT12 1.3 Transmitter Rear13 1.4 Control Stick Length Adjustment13 1.5 Direct Servo Control (DSC)14 1.6Neck Strap Attachment14 2. Connections15 2.1 Installation Requirements15 2.2 Connections15 3. Key Input and Display16 4. Battery Alarm and Display16 5. Input Mode and Functions17 5.1 Normal Display17 5.2 Direct Trim Access Display17 5.3 Mode Types17 5.4 Throttle Cut17 5.5 System Mode18 5.6 Function Mode18 6. Functions (System Mode)19 6.1 Data Reset19 6.2Model Selection20 6.3 Wing Type Selection20 6.4 Model Name Entry23 7. Functions (Function Mode)24 7.1Servo Reversing24 7.2Dual Rate25 7.3Sub Trim26 7.4Travel Adjustment27 8. Data Sheets28 III. IMPORTANT INFORMATION 1. General Notes31 2. Daily Flight Checks31 3. Warranty Coverage32 4. Repair Service Instructions32 5. Frequency Chart33 TABLE OF CONTENTS We strongly encourage all prospective and current R/C aircraft pilots to join the Academy of Model Aeronautics. The AMA is a non-profit organization that provides services to model aircraft pilots. As an AMA member you will receive a monthly magazine entitled Model Aviation, as well as a liability insurance plan to cover against possible accident or injury. All AMA charter aircraft clubs require individuals to hold a current AMA membership prior to operation of their models. For further information you can contact the AMA at: Academy of Model Aeronautics 5151 East Memorial Drive Muncie, IN 47302 (317) 287-1256 Thank you for purchasing the JR XF631 6-Channel Radio System. This unit has been designed to provide the modeler with a high-quality, user-friendly radio system that can be depended upon for years to come. It’s important that you carefully read this manual before attempting to operate your system. Please pay particular attention to Page 10, Introduction 4, “Battery Charging.” AMA INFORMATION INTRODUCTION TO THE XF631 RADIO SYSTEM 4 XF631 MANUAL Quick Start XF631 QUICK START In this manual you will find in-depth instructions that detail all the steps and procedures you should follow in order to program each of the XF631’s features. For modelers who want to get into the air fast, we have provided Quick Start. Quick Start covers the basic programming information necessary to get you airborne. Later, when you want to learn more about specific features of the XF631, turn to the appropriate pages(s) in this manual for more detailed programming information. Note:Please charge the system batteries as indicated in step 4.1 before attempting the Quick Start setup and again before flying the model. Turn on the transmitter and check to ensure that the aileron, elevator, and rudder trim valves are set to the 0 (neutral) position. Next, set the throttle trim valve to the full low (-40) position by pressing the throttle trim lever down. DIGITAL TRIM SETTINGS 1 SERVO REVERSING 2 REV  NORM THR CHANNEL SCROLL INCREASE DECREASE ENTER DIGITAL TRIM EQUIPPED 6 CHANNEL MULTI-DATA COMPUTER DISPLAY SYSTEM REV  NORM THR CHANNEL SCROLL INCREASE DECREASE ENTER DIGITAL TRIM EQUIPPED 6 CHANNEL MULTI-DATA COMPUTER DISPLAY SYSTEM With the transmitter on, press the Scrolland Increase buttons upward simultaneously until a beep is heard. Press the Channelbutton to select the channel you want to reverse. Press the Increaseor Decreasebutton to reverse the direction of the channel you selected. REV  NORM THR CHANNEL SCROLL INCREASE DECREASE ENTER DIGITAL TRIM EQUIPPED 6 CHANNEL MULTI-DATA COMPUTER DISPLAY SYSTEM Press the Scrollbutton (if necessary) until “REVERSE-NORM” appears on the screen. A B C CHANNEL SCROLL INCREASE DECREASE ENTER DIGITAL TRIM EQUIPPED 6 CHANNEL MULTI-DATA COMPUTER DISPLAY SYSTEM TRV ADJ. AIL +I00 % CHANNEL SCROLL INCREASE DECREASE ENTER DIGITAL TRIM EQUIPPED 6 CHANNEL MULTI-DATA COMPUTER DISPLAY SYSTEM TRV ADJ. AIL +I07 % 5 XF631 MANUAL Quick Start XF631 QUICK START Press the Scroll button until “TRV ADJ” appears on the screen. Press the Channelbutton to select the channel on which you want the travel adjusted. INCREASE To increase the travel, move the stick (i.e. aileron) to the right then press the Increasebutton to adjust the right travel. Release the Increasebutton and move the same stick to the left. Press the Increasebutton to adjust the left travel. DECREASE To decrease the travel, move the stick (i.e. aileron) to the right then press the Decreasebutton to adjust the right travel. Release the Decreasebutton and move the same stick to the left. Press theDecrease button to adjust the left travel. A B C TRAVEL ADJUSTMENT 3 CHANNEL SCROLL INCREASE DECREASE ENTER DIGITAL TRIM EQUIPPED 6 CHANNEL MULTI-DATA COMPUTER DISPLAY SYSTEM I0.4 V AC I Press the Scrolland Increasebuttons upwards simultaneously to return to the main screen and exit the Function mode. Note: Before flying, check that the direction and travel of all control surfaces move correctly. Before the initial start of your model, please check to ensure that when the Throttle Cutbutton is pressed, the engine’s carburetor barrel will move to the fully closed (engine off) position. This safety feature ensures that the engine can be shut off immediately in case of a problem or safety concern. THROTTLE AUTO CUT 4 6 XF631 MANUAL • INTRODUCTION 1: Using This Manual / INTRODUCTION 2: Features The XF631 is a full feature introductory computer radio that can be used for airplanes. A blank data sheet is included at the end of this manual.…

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Page 1 Technical Report Transmitter Model XF631 FCC ID# BRWXF631 T A B L E O F C O N T E N T S 1.0 INTRODUCTION 1.1 Definition 1.2 Application 1.3 Construction 2.0 ENCODER THEORY OF OPERATION 3.0 THEORY OF OPERATION 3.1 General 3.2 Block Diagram 4.0 FAILURE ANALYSIS 5.0 APPENDICES 5.1 Transmitter Block Diagram 5.2 Transmitter Schematic Diagram 5.3 Transmitter Photographs and ID Labels 5.4 Transmitter Tune-Up Procedure 5.5 Crystal Specifications 5.6 Test Data Page 2 Technical Report Transmitter Model XF631 FCC ID# BRWXF631 1.0 INTRODUCTION 1.1 Definition The Model XF631 is a transmitter for the Remote Control (R/C) of models such as airplane, helicopters,etc. This Transmitter is for FM System, available for the PPM(Pulse Position Modulation). This Transmitter is a part of the HORIZON HOBBY DISTRIBUTORS, INC. PPM"family" of Remote Control Transmitters which at this time consists of: Transmitter Model # FCC ID # F400EX BRWF400EX XF421EX BRWXF421EX QUATTRO BRWQUATTRO Separate Applications for each transmitters and for the receivers are submitted as required by the Commission. The Manufacturer, Japan Remote Control Company (JR), manufactures all transmitters and receivers. The PPM family of R/C systems is exported by JR to the United States of America, and several European and Asian Countries. The Applicant for this Equipment Authorization, HORIZON HOBBY DISTRIBUTORS, INC. will, following receipt of Grant of Equipment Authorization, import only those versions of these R/C radios which are allowed for use in the USA under the Rules and Regulations of the Federal Communications. The 72 - 73 MHz version of this transmitter is the subject of this Application; these are the units which will be offered for sale to the general public. Page 3 Technical Report Transmitter Model XF631 FCC ID# BRWXF631 1.2 Application The Model XF631 R/C transmitter utilizes " Frequency Modulation" to convey the PPM encoded position of its control sticks (joysticks) and toggle switches to its companion R/C receiver, where the PPM encoded pulse train is demodulated, decoded, and supplied to a number of servo-mechanisms for positioning of control surfaces, throttle etc. on the model. The Frequency-Shift-Keying of the transmitter carrier takes place in the rhythm of the PPM pulse train. Both transmitter and receiver are very narrow band units; they have been designed to comply with the European requirements of 10 KHz channel spacing. 1.3 Construction The Model XF631 Transmitter all consists of a plastic case. (Reference is made to Fig. 5.1, Transmitter Block Diagram) * control sticks and control switches * a 9.6V rechargeable (Nicad) battery * an analog-to-digital converter (ADC) * a microprocessor to create the PPM pulse train (M34520M6A-815FP) * a modulator driver stage * a RF power stage * a telescopic antenna This Transmitter is to be made available by the importer only on those carrier frequencies in the 72 - 73 MHz frequency band which are at present authorized for R/C use. Page 4 Technical Report Transmitter Model XF631 FCC ID# BRWXF631 2.0 ENCODER THEORY OF OPERATION Reference is made to Figure 5.1, Transmitter Block Diagram. The functions of the encoder are to: * accept the analog voltages from the control inputs (joysticks, toggle switch). * process the analog voltages to create control mixing, adding, reversing, etc., as desired by the user. * sample these voltages in a cyclic rhythm under control of the system's internal timing generator. (This process is called commutation.) * process these analog voltages into binary weighted digital control words by means of an Analog-to-Digital Converter (ADC). * store these digital representations of the analog control input into a temporary memory (RAM). * supply this serial data stream to a buffer-driver for modulation of the RF Transmitter. * provide "housekeeping" of the encoding process by means of a quarts crystal controlled internal clock. * provide supply voltages to the RF section (Vcc = 9.6V battery voltage; Vreg = 6.0V regulated voltage). The entire program which controls the timing housekeeping, parallel-to-serial conversion process, and insertion of synchronization words and error detection codes is governed by a Central Processing Unit (CPU) under control by an internally stored program residing in Read-Only Memory (ROM). The CPU, RAM and ROM are all part of a single-chip microprocessor. Resolution of the Analog-to-Digital conversion process is nine (9) bits for a control accuracy of 1:2 9 Page 5 Technical Report Transmitter Model QUATTRO FCC ID# BRWXF631 3.0 THEORY OF OPERATION 3.1 General Reference is made to Figure 5.1, Transmitter Block Diagram. The Horizon Hobbies Model XF631 R/C Transmitter is a tow sticks type Transmitter. It operates on any of the R/C frequency (Channels) allowed by the Commission in the 72 -73 MHz frequency band. Selection of the desired RF channel is made by Quarts crystal. This transmitter employs Frequency-Sift-Keying (FSK) of the carrier frequency, whereby the output frequency is either low or high due to the symmetrical FSK modulation process, the (center) output frequency cannot be directly measured, but must be calculated by taking the average of the high and low frequency states. m m m = shift from center frequency m = approx. 1.8 KHz f f f low c high f low + f high f carrier = 2 The peak-to-peak deviation of the FSK signal is approximately 4 KHz ("sliver modulation") Because of the unfamiliarity of the general public with the term FSK, this modulation technique is commonly named FM. Page 6 Technical Report Transmitter Model XF631 FCC ID# BRWXF631 3.2 Block Diagram (Reference is made to Figure 5.1) The (up to) four control potentiometers are at the right side of the schematic drawing. The control potentiometer, which is mechanically coupled to the control (joy) stick, is supplied with the regulated 5.0V voltage. The wiper on this pot is exactly centered in the neutral control stick position. All analog processing is performed…

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FCC ID# BRWXF631 page 13 page 17 FCC ID# BRWXF631

October 6,2000 Federal Communications Commission Equipment Authorization Division, Applications Processing Branch 7435 Oakland Mills Road Columbia, MD 21046 RE) FCC ID: BRWXF631 (EA98953) To whom it may concern; Please refer to the additional information listed below while reviewing the BRWXF631 System. 1) Section 95.645 (b) states that plug-in crystals must not be accessible to the user. Indicate whether or not crystals are accessible to the user. Although the transmitter crystal is visible from the back of the transmitter, each crystal is glued in place prior to shipment making it a permanent installation. Consumer removal of the crystal will normally result in damage to the crystal. Therefore, frequency changes are done at the service center only. 2) The Manual must contain warnings per section 95.653 A) Please refer to the manual attachment for this information B) All content for operation is contained in the instruction manual. 1) All instructions are contained in the instruction manual. 2) There are no adjustments accessible to the user that would be in violation with the FCC rules, except as noted in the section #3 below. 3) Noted. We will be adding the following information to the instruction manual under “Frequency Chart”: “Note: The Federal Communications Commission (FCC) requires that changes in radio frequency must be performed by an authorized service technician only (Horizon Service Center). Any frequency changes made by a non-certified technician may result in a violation of the FCC rules” 4) This section is not applicable to our use. If there is any further information required, please contact me directly at: Horizon Hobby Distributors ATTN: Len Sabato Fax: 217-355-0058 Phone: 217-352-1958 Ext. 454 [email protected] Best Regards ; Len Sabato

Page 1 Technical Report Transmitter Model XF631 FCC ID# BRWXF631 T A B L E O F C O N T E N T S 1.0 INTRODUCTION 1.1 Definition 1.2 Application 1.3 Construction 2.0 ENCODER THEORY OF OPERATION 3.0 THEORY OF OPERATION 3.1 General 3.2 Block Diagram 4.0 FAILURE ANALYSIS 5.0 APPENDICES 5.1 Transmitter Block Diagram 5.2 Transmitter Schematic Diagram 5.3 Transmitter Photographs and ID Labels 5.4 Transmitter Tune-Up Procedure 5.5 Crystal Specifications 5.6 Test Data Page 2 Technical Report Transmitter Model XF631 FCC ID# BRWXF631 1.0 INTRODUCTION 1.1 Definition The Model XF631 is a transmitter for the Remote Control (R/C) of models such as airplane, helicopters,etc. This Transmitter is for FM System, available for the PPM(Pulse Position Modulation). This Transmitter is a part of the HORIZON HOBBY DISTRIBUTORS, INC. PPM"family" of Remote Control Transmitters which at this time consists of: Transmitter Model # FCC ID # F400EX BRWF400EX XF421EX BRWXF421EX QUATTRO BRWQUATTRO Separate Applications for each transmitters and for the receivers are submitted as required by the Commission. The Manufacturer, Japan Remote Control Company (JR), manufactures all transmitters and receivers. The PPM family of R/C systems is exported by JR to the United States of America, and several European and Asian Countries. The Applicant for this Equipment Authorization, HORIZON HOBBY DISTRIBUTORS, INC. will, following receipt of Grant of Equipment Authorization, import only those versions of these R/C radios which are allowed for use in the USA under the Rules and Regulations of the Federal Communications. The 72 - 73 MHz version of this transmitter is the subject of this Application; these are the units which will be offered for sale to the general public. Page 3 Technical Report Transmitter Model XF631 FCC ID# BRWXF631 1.2 Application The Model XF631 R/C transmitter utilizes " Frequency Modulation" to convey the PPM encoded position of its control sticks (joysticks) and toggle switches to its companion R/C receiver, where the PPM encoded pulse train is demodulated, decoded, and supplied to a number of servo-mechanisms for positioning of control surfaces, throttle etc. on the model. The Frequency-Shift-Keying of the transmitter carrier takes place in the rhythm of the PPM pulse train. Both transmitter and receiver are very narrow band units; they have been designed to comply with the European requirements of 10 KHz channel spacing. 1.3 Construction The Model XF631 Transmitter all consists of a plastic case. (Reference is made to Fig. 5.1, Transmitter Block Diagram) * control sticks and control switches * a 9.6V rechargeable (Nicad) battery * an analog-to-digital converter (ADC) * a microprocessor to create the PPM pulse train (M34520M6A-815FP) * a modulator driver stage * a RF power stage * a telescopic antenna This Transmitter is to be made available by the importer only on those carrier frequencies in the 72 - 73 MHz frequency band which are at present authorized for R/C use. Page 4 Technical Report Transmitter Model XF631 FCC ID# BRWXF631 2.0 ENCODER THEORY OF OPERATION Reference is made to Figure 5.1, Transmitter Block Diagram. The functions of the encoder are to: * accept the analog voltages from the control inputs (joysticks, toggle switch). * process the analog voltages to create control mixing, adding, reversing, etc., as desired by the user. * sample these voltages in a cyclic rhythm under control of the system's internal timing generator. (This process is called commutation.) * process these analog voltages into binary weighted digital control words by means of an Analog-to-Digital Converter (ADC). * store these digital representations of the analog control input into a temporary memory (RAM). * supply this serial data stream to a buffer-driver for modulation of the RF Transmitter. * provide "housekeeping" of the encoding process by means of a quarts crystal controlled internal clock. * provide supply voltages to the RF section (Vcc = 9.6V battery voltage; Vreg = 6.0V regulated voltage). The entire program which controls the timing housekeeping, parallel-to-serial conversion process, and insertion of synchronization words and error detection codes is governed by a Central Processing Unit (CPU) under control by an internally stored program residing in Read-Only Memory (ROM). The CPU, RAM and ROM are all part of a single-chip microprocessor. Resolution of the Analog-to-Digital conversion process is nine (9) bits for a control accuracy of 1:2 9 Page 5 Technical Report Transmitter Model QUATTRO FCC ID# BRWXF631 3.0 THEORY OF OPERATION 3.1 General Reference is made to Figure 5.1, Transmitter Block Diagram. The Horizon Hobbies Model XF631 R/C Transmitter is a tow sticks type Transmitter. It operates on any of the R/C frequency (Channels) allowed by the Commission in the 72 -73 MHz frequency band. Selection of the desired RF channel is made by Quarts crystal. This transmitter employs Frequency-Sift-Keying (FSK) of the carrier frequency, whereby the output frequency is either low or high due to the symmetrical FSK modulation process, the (center) output frequency cannot be directly measured, but must be calculated by taking the average of the high and low frequency states. m m m = shift from center frequency m = approx. 1.8 KHz f f f low c high f low + f high f carrier = 2 The peak-to-peak deviation of the FSK signal is approximately 4 KHz ("sliver modulation") Because of the unfamiliarity of the general public with the term FSK, this modulation technique is commonly named FM. Page 6 Technical Report Transmitter Model XF631 FCC ID# BRWXF631 3.2 Block Diagram (Reference is made to Figure 5.1) The (up to) four control potentiometers are at the right side of the schematic drawing. The control potentiometer, which is mechanically coupled to the control (joy) stick, is supplied with the regulated 5.0V voltage. The wiper on this pot is exactly centered in the neutral control stick position. All analog processing is performed…

Text truncated - open the document above for the full version.

page 17 FCC ID# BRWXF631

Page 1 Technical Report Transmitter Model XF631 FCC ID# BRWXF631 T A B L E O F C O N T E N T S 1.0 INTRODUCTION 1.1 Definition 1.2 Application 1.3 Construction 2.0 ENCODER THEORY OF OPERATION 3.0 THEORY OF OPERATION 3.1 General 3.2 Block Diagram 4.0 FAILURE ANALYSIS 5.0 APPENDICES 5.1 Transmitter Block Diagram 5.2 Transmitter Schematic Diagram 5.3 Transmitter Photographs and ID Labels 5.4 Transmitter Tune-Up Procedure 5.5 Crystal Specifications 5.6 Test Data Page 2 Technical Report Transmitter Model XF631 FCC ID# BRWXF631 1.0 INTRODUCTION 1.1 Definition The Model XF631 is a transmitter for the Remote Control (R/C) of models such as airplane, helicopters,etc. This Transmitter is for FM System, available for the PPM(Pulse Position Modulation). This Transmitter is a part of the HORIZON HOBBY DISTRIBUTORS, INC. PPM"family" of Remote Control Transmitters which at this time consists of: Transmitter Model # FCC ID # F400EX BRWF400EX XF421EX BRWXF421EX QUATTRO BRWQUATTRO Separate Applications for each transmitters and for the receivers are submitted as required by the Commission. The Manufacturer, Japan Remote Control Company (JR), manufactures all transmitters and receivers. The PPM family of R/C systems is exported by JR to the United States of America, and several European and Asian Countries. The Applicant for this Equipment Authorization, HORIZON HOBBY DISTRIBUTORS, INC. will, following receipt of Grant of Equipment Authorization, import only those versions of these R/C radios which are allowed for use in the USA under the Rules and Regulations of the Federal Communications. The 72 - 73 MHz version of this transmitter is the subject of this Application; these are the units which will be offered for sale to the general public. Page 3 Technical Report Transmitter Model XF631 FCC ID# BRWXF631 1.2 Application The Model XF631 R/C transmitter utilizes " Frequency Modulation" to convey the PPM encoded position of its control sticks (joysticks) and toggle switches to its companion R/C receiver, where the PPM encoded pulse train is demodulated, decoded, and supplied to a number of servo-mechanisms for positioning of control surfaces, throttle etc. on the model. The Frequency-Shift-Keying of the transmitter carrier takes place in the rhythm of the PPM pulse train. Both transmitter and receiver are very narrow band units; they have been designed to comply with the European requirements of 10 KHz channel spacing. 1.3 Construction The Model XF631 Transmitter all consists of a plastic case. (Reference is made to Fig. 5.1, Transmitter Block Diagram) * control sticks and control switches * a 9.6V rechargeable (Nicad) battery * an analog-to-digital converter (ADC) * a microprocessor to create the PPM pulse train (M34520M6A-815FP) * a modulator driver stage * a RF power stage * a telescopic antenna This Transmitter is to be made available by the importer only on those carrier frequencies in the 72 - 73 MHz frequency band which are at present authorized for R/C use. Page 4 Technical Report Transmitter Model XF631 FCC ID# BRWXF631 2.0 ENCODER THEORY OF OPERATION Reference is made to Figure 5.1, Transmitter Block Diagram. The functions of the encoder are to: * accept the analog voltages from the control inputs (joysticks, toggle switch). * process the analog voltages to create control mixing, adding, reversing, etc., as desired by the user. * sample these voltages in a cyclic rhythm under control of the system's internal timing generator. (This process is called commutation.) * process these analog voltages into binary weighted digital control words by means of an Analog-to-Digital Converter (ADC). * store these digital representations of the analog control input into a temporary memory (RAM). * supply this serial data stream to a buffer-driver for modulation of the RF Transmitter. * provide "housekeeping" of the encoding process by means of a quarts crystal controlled internal clock. * provide supply voltages to the RF section (Vcc = 9.6V battery voltage; Vreg = 6.0V regulated voltage). The entire program which controls the timing housekeeping, parallel-to-serial conversion process, and insertion of synchronization words and error detection codes is governed by a Central Processing Unit (CPU) under control by an internally stored program residing in Read-Only Memory (ROM). The CPU, RAM and ROM are all part of a single-chip microprocessor. Resolution of the Analog-to-Digital conversion process is nine (9) bits for a control accuracy of 1:2 9 Page 5 Technical Report Transmitter Model QUATTRO FCC ID# BRWXF631 3.0 THEORY OF OPERATION 3.1 General Reference is made to Figure 5.1, Transmitter Block Diagram. The Horizon Hobbies Model XF631 R/C Transmitter is a tow sticks type Transmitter. It operates on any of the R/C frequency (Channels) allowed by the Commission in the 72 -73 MHz frequency band. Selection of the desired RF channel is made by Quarts crystal. This transmitter employs Frequency-Sift-Keying (FSK) of the carrier frequency, whereby the output frequency is either low or high due to the symmetrical FSK modulation process, the (center) output frequency cannot be directly measured, but must be calculated by taking the average of the high and low frequency states. m m m = shift from center frequency m = approx. 1.8 KHz f f f low c high f low + f high f carrier = 2 The peak-to-peak deviation of the FSK signal is approximately 4 KHz ("sliver modulation") Because of the unfamiliarity of the general public with the term FSK, this modulation technique is commonly named FM. Page 6 Technical Report Transmitter Model XF631 FCC ID# BRWXF631 3.2 Block Diagram (Reference is made to Figure 5.1) The (up to) four control potentiometers are at the right side of the schematic drawing. The control potentiometer, which is mechanically coupled to the control (joy) stick, is supplied with the regulated 5.0V voltage. The wiper on this pot is exactly centered in the neutral control stick position. All analog processing is performed…

Text truncated - open the document above for the full version.

FCC ID# BRWXF631 page 14 FCC ID# BRWXF631 page 15 FCC ID# BRWXF631 page 16

Page 1 Technical Report Transmitter Model XF631 FCC ID# BRWXF631 T A B L E O F C O N T E N T S 1.0 INTRODUCTION 1.1 Definition 1.2 Application 1.3 Construction 2.0 ENCODER THEORY OF OPERATION 3.0 THEORY OF OPERATION 3.1 General 3.2 Block Diagram 4.0 FAILURE ANALYSIS 5.0 APPENDICES 5.1 Transmitter Block Diagram 5.2 Transmitter Schematic Diagram 5.3 Transmitter Photographs and ID Labels 5.4 Transmitter Tune-Up Procedure 5.5 Crystal Specifications 5.6 Test Data Page 2 Technical Report Transmitter Model XF631 FCC ID# BRWXF631 1.0 INTRODUCTION 1.1 Definition The Model XF631 is a transmitter for the Remote Control (R/C) of models such as airplane, helicopters,etc. This Transmitter is for FM System, available for the PPM(Pulse Position Modulation). This Transmitter is a part of the HORIZON HOBBY DISTRIBUTORS, INC. PPM"family" of Remote Control Transmitters which at this time consists of: Transmitter Model # FCC ID # F400EX BRWF400EX XF421EX BRWXF421EX QUATTRO BRWQUATTRO Separate Applications for each transmitters and for the receivers are submitted as required by the Commission. The Manufacturer, Japan Remote Control Company (JR), manufactures all transmitters and receivers. The PPM family of R/C systems is exported by JR to the United States of America, and several European and Asian Countries. The Applicant for this Equipment Authorization, HORIZON HOBBY DISTRIBUTORS, INC. will, following receipt of Grant of Equipment Authorization, import only those versions of these R/C radios which are allowed for use in the USA under the Rules and Regulations of the Federal Communications. The 72 - 73 MHz version of this transmitter is the subject of this Application; these are the units which will be offered for sale to the general public. Page 3 Technical Report Transmitter Model XF631 FCC ID# BRWXF631 1.2 Application The Model XF631 R/C transmitter utilizes " Frequency Modulation" to convey the PPM encoded position of its control sticks (joysticks) and toggle switches to its companion R/C receiver, where the PPM encoded pulse train is demodulated, decoded, and supplied to a number of servo-mechanisms for positioning of control surfaces, throttle etc. on the model. The Frequency-Shift-Keying of the transmitter carrier takes place in the rhythm of the PPM pulse train. Both transmitter and receiver are very narrow band units; they have been designed to comply with the European requirements of 10 KHz channel spacing. 1.3 Construction The Model XF631 Transmitter all consists of a plastic case. (Reference is made to Fig. 5.1, Transmitter Block Diagram) * control sticks and control switches * a 9.6V rechargeable (Nicad) battery * an analog-to-digital converter (ADC) * a microprocessor to create the PPM pulse train (M34520M6A-815FP) * a modulator driver stage * a RF power stage * a telescopic antenna This Transmitter is to be made available by the importer only on those carrier frequencies in the 72 - 73 MHz frequency band which are at present authorized for R/C use. Page 4 Technical Report Transmitter Model XF631 FCC ID# BRWXF631 2.0 ENCODER THEORY OF OPERATION Reference is made to Figure 5.1, Transmitter Block Diagram. The functions of the encoder are to: * accept the analog voltages from the control inputs (joysticks, toggle switch). * process the analog voltages to create control mixing, adding, reversing, etc., as desired by the user. * sample these voltages in a cyclic rhythm under control of the system's internal timing generator. (This process is called commutation.) * process these analog voltages into binary weighted digital control words by means of an Analog-to-Digital Converter (ADC). * store these digital representations of the analog control input into a temporary memory (RAM). * supply this serial data stream to a buffer-driver for modulation of the RF Transmitter. * provide "housekeeping" of the encoding process by means of a quarts crystal controlled internal clock. * provide supply voltages to the RF section (Vcc = 9.6V battery voltage; Vreg = 6.0V regulated voltage). The entire program w…

Text truncated - open the document above for the full version.