OFS500SERIES

FCC ID Label Location

Model 520 Operational Description: The model 520 is a remote control used in industrial applications such as remote control of hoists, trolleys and other automatic control systems. The device utilizes narrowband FM to transmit its control information(Up, Down, East, West) at the carrier frequency of 301.105 MHz. The transmitter fundamental frequency is set by the use of a quartz crystal. The device operates on 3.0 VDC derived from two AA batteries.

REPORT OF MEASUREMENTS Applicant: Mitsuboshi Boeki, Inc. Device:301.105 MHz RF Transmitter FCC ID: OFS500SERIES Power Requirements: 4.5 VDC via 3X “AA” Batteries Applicable Rule Section:Part 15, Subpart C, Section 15.231 TEST RESULTS 15.231 (a) -The device is used as a transmitter for versatile remote control safety purposes such as controlling cranes, multiple hoists, trolleys, mining equipment etc. 15.231 (a)(1) & -The transmitter is manually operated and ceases transmission within 5 15.231(2)seconds after deactivation. 15.231 (a)(3) -The transmitter does not perform periodic transmissions. 15.231 (a)(4)-The device is employed for RC purposes involving safety of life and may transmit during the pendency of the alarm condition. 15.231 (b) -The fundamental field strength did not exceed 5,460 μV/M (Average) at a test distance of 3 meters. In addition, the requirements of section 15.35 for averaging pulsed emissions and for limiting peak emissions were met. The field strength of harmonic and spurious emissions did not exceed 546 μV/M (AVERAGE). 15.231 (c) -The device operates at 301.105 MHz. The bandwidth of emissions did not exceed 0.25% of the operating frequency (752.7 kHz). REPORT OF MEASUREMENTS (continued) DETERMINATION OF FIELD STRENGTH LIMITS The field strength limits shown below are found in Section 15.231. Frequency Limit F1=2603750 =L1 Fo=301.105Lo F2=47012500 =L2 The formula below was utilized to determine the limits: Limit = L1 + [(Fo-F1)(L2-L1)/(F2-F1)] Solving yields: Fundamental Limit= 5,460 μV/M (AVERAGE) @ 3 Meters Harmonic Limit= 546 μV/M (AVERAGE) @ 3 Meters DETERMINATION OF DUTY CYCLE The unit’s RF output was directly coupled to the input of the spectrum analyzer. The analyzer was set for a frequency span of 0Hz. The sweep time was then adjusted in order to display one full pulse train. The transmitter on time was then summed and compared to the time for one full cycle in order to obtain the duty cycle. Transmitter On Time=>100 milliseconds (maximum- worst case in 100 ms) Transmitter Cycle Time=0 milliseconds Transmitter Duty Cycle=100.0 % Correction Factor = -0.0 db GENERAL NOTES 1. All readings were taken utilizing a peak detector function at a test distance of 3 meters. 2. The duty cycle was applied to the peak readings in order to determine the average value of the emissions. 3. All measurements were made with (3) new “AA” batteries installed in the unit. 4. The frequency range was scanned from 30 MHz to 3.1 GHz . All emissions not reported were more than 10 dB below the specified limit. EQUIPMENT LIST FCC Part 15 Radiated Emissions, 30 MHz to 3.1 GHz ENTypeManufacturerFrequency Range Model No.Cal Date Due Date 067Open Area Test SiteRetlif3 MeterRNY8/30/978/30/99 088AConical Log SpiralElectro-Mechanics200 MHz - 1 GHz310112/28/9812/28/99 133Broadband Pre-AmplifierElectro-Metrics10 kHz - 1 GHz, 26dBBPA-10006/22/986/22/99 141Spectrum AnalyzerHewlett Packard100 Hz - 40 GHz8566B9/19/983/19/99 141AGraphics PlotterHewlett PackardN/A7470A3/4/983/4/99 141BQuasi-Peak AdaptorHewlett Packard100 Hz - 1 GHz85650A9/19/983/19/99 206B6.0 dB AttenuatorTexscan0 - 1.0 GHzFP-50 - 6 dB6/22/986/22/99 523BiconilogElectro-Mechanics26 - 2000 MHz3142B10/22/984/22/00 530AM/FM Signal GeneratorMarconi Instru.10 kHz - 1.2 GHz20234/29/984/29/99