QE8510XXTX27RC Transmitter 27 MHz

#51011 27MHz TX Block Diagram
ANTENNA













CONTROL KEY MODULATOR Q1, Q2 OSCILLATOR CRYSTAL Y1 27.145MHz ENCODER U2 TX6

hi Tim, Below are the responses for the comment : 1) Previous transmitters reviewed would meet the FCC requirements regardless of the encoding scheme use. However for this transmitter, worse case encoding must be understood to ensure this device always meets the FCC rules. Please note that for duty cycle corrections, the FCC requires worse case. In theory, this device sends 16 pulses per period. It appears that the pulses are width encoded. Worse case encoding could be considered to be 16 pulses at 1.03 ms per 22.3 ms. This would yield only a correction factor of 2.6 dB and would cause the device to be in excess of the average limits. It is uncertain what the theoretical worse case data encoding will actually be (considered more than one button can be pressed at a time. Please ensure the worse case duty cycle has been evaluated and provide information as necessary. Worst case has been verified, different combination of buttons can only yield different positioning of the pulse, that is the period of the transmitter is remain unchanged, but the position of the longer pulse (1.03ms) and shorter pulse (0.33ms) is changed. That makes the average factor remain unchange (-7.4dB) for all combinations, since the duty cycle still include 6 long pulses and 10 short pulses. Details can refer to the attachment for two examples of different buttons combination. ( I also attached 49MHz duty cycle for your reference) 2) FYI....The preferred form for the FCC label uses the term “FCC ID:” (with colon) not simply “FCC ID”. It is recommended that this is changed. A revised FCC Label is attached. (Both 27MHz and 49MHz devices are revised) Best Regards, Tomm y

Operation Description The transmitter operates at 27.145MHz, which is controlled by a crystal. It is powered by 9V battery. There are two-control key on the transmitter. When the forward control trigger is pushed/pulled once, a radio frequency will be transmitted for the receiver for going forward/backward. When the direction control steering wheel is turned the left/right once, a radio frequency will be transmitted for the receiver for going left/right. Refer to the transmitter circuit design, the circuit description is listed below:
 U2 and associate circuit act as encoder
 Y1 and associate circuit act as oscillator
Q1, Q2 and associate circuit act as RF amplifier
 C10, C11, L4 and associate circuit act as low pass filter

TEST REPORT Report No. : AF020343-001 Date : 2005 August 30 For and on behalf of CMA Testing and Certification Laboratories Authorized Signature : Page 1 of 11 Danny Chui EMC Engineer - EL. Division FCC ID : QE8510XXTX27 This document shall not be reproduced either in full or in part except with written approval by the Authorized Representative of CMA Testing. Room 1302, Yan Hing Centre, 9-13 Wong Chuk Yeung St.., Fo Tan, Shatin, Hong Kong. Tel: (852) 2698 8198 Fax: (852) 2695 4177 E-mail: [email protected] Web Site: http://www.cmatcl.com Application No. : LF213755(1) Client : Interactive Toy Concepts (HK) Ltd 7/F, Eu Yan Sang Tower, 11-15 Chatham Road South, T.S.T, Kowloon, Hong Kong Sample Description : One(1) submitted sample stated to be Radio Controlled Snowmobile of Model No. 51011 Rating : 1 x 9V size battery No. of submitted sample : One (1) piece*** Date Received : Test Period : Test Requested : Test Method : Test Result : Conclusion : 2005 August 18 2005 August 18 – 2005 August 26 FCC Part 15 Certification FCC Rules and Regulations Part 15 – July 2004 ANSI C63.4 – 2003 See attached sheet(s) from page 2 to 11. The submitted sample was found to comply with requirement of FCC Part 15 Subpart C. TEST REPORT Report No. : AF020343-001 Date : 2005 August 30 Page 2 of 11 FCC ID : QE8510XXTX27 This document shall not be reproduced either in full or in part except with written approval by the Authorized Representative of CMA Testing. Room 1302, Yan Hing Centre, 9-13 Wong Chuk Yeung St.., Fo Tan, Shatin, Hong Kong. Tel: (852) 2698 8198 Fax: (852) 2695 4177 E-mail: [email protected] Web Site: http://www.cmatcl.com Table of Contents 1 General Information .................................................................................................................................. 3 1.1 General Description ........................................................................................................................... 3 1.2 Location of the test site ...................................................................................................................... 4 1.3 List of measuring equipment.............................................................................................................. 5 2 Description of the radiated emission test .................................................................................................. 6 2.1 Test Procedure ................................................................................................................................... 6 2.2 Test Result ......................................................................................................................................... 6 2.3 Radiated Emission Measurement Data .............................................................................................. 7 3 Description of the Line-conducted Test .................................................................................................... 8 3.1 Test Procedure ................................................................................................................................... 8 3.2 Test Result ......................................................................................................................................... 8 3.3 Graph and Table of Conducted Emission Measurement Data ........................................................... 8 4 Photograph ................................................................................................................................................ 9 4.1 Photographs of the Test Setup for Radiated Emission and Conduction Emission............................. 9 4.2 Photographs of the External and Internal Configurations of the EUT............................................... 9 5 Supplementary document ......................................................................................................................... 10 5.1 Bandwidth ........................................................................................................................................ 10 5.2 Duty Cycle ....................................................................................................................................... 10 6 Appendices............................................................................................................................................... 11 TEST REPORT Report No. : AF020343-001 Date : 2005 August 30 Page 3 of 11 FCC ID : QE8510XXTX27 This document shall not be reproduced either in full or in part except with written approval by the Authorized Representative of CMA Testing. Room 1302, Yan Hing Centre, 9-13 Wong Chuk Yeung St.., Fo Tan, Shatin, Hong Kong. Tel: (852) 2698 8198 Fax: (852) 2695 4177 E-mail: [email protected] Web Site: http://www.cmatcl.com 1 General Information 1.1 General Description The equipment under test (EUT) is a transmitter for Radio Controlled Snowmobile. Operating at 27.145MHz which is controlled by a crystal. The EUT is powered by a 9Vsize battery. There are two control trigger in the EUT. When the forward, backward, turn left and turn right trigger is pressed once. It will transmit different radio signal for receiver to go different direction. The brief circuit description is listed as follows : - U2 and associated circuit act as encoder. - Y1 and associated circuit act as oscillator. - Q1, Q2 and associated circuit act as modulator. - C10, C11, L4 and associated circuit act as low pass filter. TEST REPORT Report No. : AF020343-001 Date : 2005 August 30 Page 4 of 11 FCC ID : QE8510XXTX27 This document shall not be reproduced either in full or in part except with written approval by the Authorized Representative of CMA Testing. Room 1302, Yan Hing Centre, 9-13 Wong Chuk Yeung St.., Fo Tan, Shatin, Hong Kong. Tel: (852) 2698 8198 Fax: (852) 2695 4177 E-mail: [email protected] Web Site: http://www.cmatcl.com 1.2 Location of the test site Radiated emissions measurement…

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CMA Testing and Certification Laboratories Job No.: J00037895 WF-EL-EMC-15 Edition 3 2005 Mar 29 Page of Bandwidth Plot Bandwidth 1

CMA Testing and Certification Laboratories Job No.: J00037895 WF-EL-EMC-15 Edition 3 2005 Mar 29 Page of Duty Cycle Duty Cycle 1 Duty Cycle 2 CMA Testing and Certification Laboratories Job No.: J00037895 WF-EL-EMC-15 Edition 3 2005 Mar 29 Page of Duty Cycle 3

CMA Testing and Certification Laboratories Job No.: J00037895 WF-EL-EMC-15 Edition 3 2005 Mar 29 Page of Duty Cycle Duty Cycle 1 (Combination 1) Duty Cycle 2 (Combination 2)