BBG-55003R/C Transmitter

Front View Back View Left Side View Right Side View

Inside Front Case Inside Back Case Battery Compartment Circuit Board w/Shield Circuit Board w/o Shield Circuit Board – Track Side

OPERATIONAL DESCRIPTION The CRE-55003 is a low power, non-voice, transmitter in- tended for remote control of model railroad locomotives in the 75 MHz band. The transmitter is hand-held (see photographs) with an integral monopole antenna. The operator depresses one of several front panel push buttons that in turn, vary pulse width applied to a varicap to produce frequency modulation. (See Figure 2.) A nominal 30 Hz repetition rate is used. The operator normally wears overalls and a train engineer’s visored hat.

ENGINEERING STATEMENT For Type Certification of ARISTO-CRAFT Model: Crest CRE-55003 FCC ID: BBG-55003 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 Aristo-Craft to make type certification measurements on the CRE-55003 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: July 6, 2001 A. INTRODUCTION The following data are submitted in connection with this request for type certification of the CRE-55003 transmitter in accordance with Part 2, Subpart J of the FCC Rules. The CRE-55003 is a low power, non-voice, transmitter intended for remote control of model railroad locomotives 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: Aristo-Craft 2. Identification of equipment: FCC ID: BBG-55003 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. 6k00F1D emission b. Frequency range: 75.41 – 75.99 MHz. c. Operating power of transmitter is fixed at the factory at 0.003 Watt – ERP(d). d. Maximum power permitted under Paragraph 95.635(b) of the FCC Rules is 750 milliwatts, and the CRE- 55003 fully complied with those power limitations. e. The dc voltage and dc currents at final amplifier: Collector voltage: 5.9 Vdc Collector current: 0.11 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 CRE-55003 has an immediately attached, integral antenna, no antenna port exists. Power was determined by substitution comparison. Assuming an ideal dipole (not the actual monopole) ERP(d) = 0.003 watts. 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. (Modulation is achieved by a varicap shunting the crystal oscillator resulting in FM.) Operator controls were adjusted for worst- case emission. The plot is within the limits imposed by paragraph 95.635(c). The horizontal scale (frequency) is 10 kHz 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 DSO with 5 mS/division sweep in the time domain of the modulated carrier. Modulation consisted of multiple bursts at a nominal 30 Hz repetition rate. 3 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: BBG-55003 FIGURE 1 4 FIGURE 2 MODULATING WAVEFORM TIME DOMAIN 5 millisecond/division sweep, time domain OCCUPIED BANDWIDTH (Modulating Waveform) FCC ID: BBG-55003 FIGURE 2 5 D. SPURIOUS EMISSIONS AT THE ANTENNA TERMINALS (Paragraph 2.991 of the Rules) Since the CRE-55003 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. MEASUREMENTS OF SPURIOUS RADIATION (Paragraph 2.993(a) (b) (2) of the Rules) Measurements of radiated spurious emissions from the CRE- 55003 were made with a Tektronix 494P spectrum analyzer using EMCO 3121C calibrated test antennas using substitution comparison. 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 6.0 Vdc. The transmitter and test antennas were arranged to maximize pickup. Both vertical and horizontal test antenna polarization were employed. Reference was power at the carrier frequency. The measurement system was capable of detecting signal…

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