AEKA03727R/C Transmitter

Internal Construction PCB Component Side PCB Solder Side

Expository Statement/Description AEKA03727 - BMX The BMX R/C Transmitter (FCC ID:AEKA03727) is a 27.145 MHz R/C transmitter. The transmitter uses a telescopic antenna approximately 18 1/2 inches in length. The RF section contains the RF carrier oscillator section and an amplifier section. The RF carrier frequency is generated using Q2 (N-P-N transistor) in conjunction with a crystal (X1=27.145 MHz) configured in an oscillator circuit. The RF amplifier circuit consists of one transistor (Q2) coupled to the antenna via C6. The matching circuit is a pi circuit comprised of C7, C8, L3. The modulation, baseband control signals, are generated within the LSI (Large Scale Integration) IC, IC1 ? TXB5. Except for the control switches (commands for vehicle movement), IC1 conditions all commands and modulates the carrier (RF) by injecting the baseband signal into the input of the RF amplifier. The transmitter operates using one 9.0 VDC battery. The transmitter does not need or use external grounding for operation .

1 FCC ID:AEKA00127 CERTIFICATION MEASUREMENT REPORT BMX R/C Transmitter FCC ID:AEKA03727 I. INTRODUCTION This measurement report is submitted in support of an Application for Certification in accordance with Part 2, Subpart J and Part 15, Subpart C (effective 6/23/89) of the Federal Communications Commission's Rules and Regulations. The equipment under test (EUT) is a low power pulsed RF transmitter. This transmitter operates at a fixed frequency within the band from 26.99 MHz to 27.28 MHz and is powered by one 9.0 Volt battery. It is identified as the BMX(FCC ID: AEKA03727). Operation under the transition provisions of Paragraph 15.37 is not requested for this device. The measurements contained in this report demonstrate compliance with the limitations in effect since 6/23/89. II. INFORMATION REQUIRED FOR CERTIFICATION Paragraph(s) 2.1033(a) This Application for Certification is filed on FCC Form 731 with all questions answered 2.1033(b)(1) the full name and mailing address of the manufacturer of the device and applicant for certification is: Taiyo Kogyo Co., Ltd. No. 1-23-17, Higashiyotsugi Katsushika-ku, Tokyo 124 Japan (2) The FCC Identifier of the device is AEKA03727. (3) A copy of the draft installation and operating instructions to be furnished to the user is included in the exhibit section of this application. (4) The transmitter is a hand-held unit and is powered by one 9 Volt 2 FCC ID:AEKA00127 battery. It is designed to operate on one of the following fixed frequencies: 26.995 MHz, 27.045 MHz, 27.095 MHz, 27.145 MHz, and 27.195 MHz. Complete circuit schematics are provided in the exhibit section. (5) A block diagram of the device is included in Exhibits. (6) A report of measurements is included in this report. (7) Photographs of this device showing the FCC label placement (actual label sample photograph included), chassis assembly, and circuit layout are included as Exhibits in this application. (8) This equipment is a stand-alone unit. No peripherals or accessories are involved. (9) Certification under the transition provisions of Paragraph 15.37 is not being requested for this device. (10) N/A. III. GENERAL TEST CONDITIONS AND PROCEDURES Measurement procedures were used as outlined in MP-1 as specified in Part 15.31, except as noted herein . The open-field tests were performed on a three- meter range maintained by Carl T. Jones Corporation at the Springfield facility. Complete description and measurement data for the site have been placed on file with the Commission. Carl T. Jones Corporation is listed by the FCC as a facility available to do measurement work for others on a contract basis. Prior to open-field testing, the equipment was placed in a shielded enclosure and scanned at a close distance to determine its emission characteristics. IV. RADIATED EMISSION MEASUREMENTS The transmitter was assembled on a rotatable wooden test stand 0.8 meters in height. The transmitter's antenna was fully extended. The emission spectrum was examined up to 1000 MHz using a Hewlett-Packard 8568B spectrum 3 FCC ID:AEKA00127 analyzer and Compliance Design "Roberts" tuned dipole antennas. At each emission frequency, the EUT was rotated 360 degrees, and the antenna was raised and lowered from one to four meters to determine the maximum emission levels. Measurements were taken using both horizontal and vertical antenna polarizations. The spectrum analyzers’ 6dB bandwidth was set to 100 kHz. The analyzer was operated using its peak detection mode for measurements of emissions less than 1000 MHz. No post-detector video filters were used. The EUT was investigated in three orthogonal planes. The highest emission amplitudes relative to the appropriate limit were measured and have been recorded in Table 1. The actual field intensity in decibels above one microvolt per meter (dBuV/m) is determined by algebraically adding the measured level in dBuV, the antenna factor (dB), and the cable loss (dB) at the appropriate frequency. FI a (dBuV/m) = FI m (dBuV) + AF (dB) + CL (dB) FI a = Actual Field Intensity FI m = Measured Field Intensity AF = Antenna Factor CL = Cable Loss As a sample calculation, assume a particular device emits a signal with a frequency of 27.145 MHz. The received signal level is measured as 62.9 dBuV. The total attenuation factor (antenna factor plus cable loss) for 27.145 MHz is 0 dB. The actual radiated field is calculated as follows: 65.3 dBμV + (0 dB) = 65.3 dBμV/m @ 3 meters, or 1840.8 μV/m @ 3 meters The field strength of the fundamental did not exceed 10,000 μV/m (80 dBμV/m) at 3 meters, as specified in Paragraph 15.227. As per the requirements defined in 15.209, the radiated emission limit at 4 FCC ID:AEKA00127 the band edges is 49.5 dBμV/m at 3 meters. As per the occupied bandwidth spectral plot, BMX 27.145 MHz XMTR, 1 kHz RBW, the highest emission level below the lower band edge is 57 dB below the modulated carrier. At the upper band edge the highest emission recorded is 54 dB below the modulated carrier. Note: because the EUT complies using peak detection (worst case) quasi-peak detection was not used. Based on the maximized peak radiation measurements of the carrier, these emission levels are: Lower Band Edge 67.2 dBμV/m - 57 dB = 10.2 dBμV/m (peak) at 3 meters ( Limit = 49.5 dBμV/m, quasi-peak ) Upper Band Edge 67.2 dBμV/m - 54 dB = 13.2 dBμV/m (peak) at 3 meters (Limit = 49.5 dBμV/m, quasi-peak) Radiated measurements to the EUT’s 10th harmonic are included in this report as Table 1. All other emissions were found to be in compliance with the restrictions of Paragraph 15.209(a) of the Commission's Rules. Because the emissions were below the limits using peak detection, average to peak ratios were not calculated. V. OCCUPIED BANDWIDTH MEASUREMENTS In order to demonstrate that the EUT's fundamental frequency is within the 26.96 to 27.28 MHz frequency band an occupied bandwidth spectral plot of the EUT's fundamental frequency is included. Paragraph 15.227(b) specifies that a…

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