O94FC2000TXAudio/Video Transmitter

            
       Camlite Electronics, Inc FC2000TX Short Range Audio Visual Transmitter Installation and Operation Manual written by Roger Odle, BSEE © January 4, 2001 Camlite Electronics Inc. Snowflake; Arizona             !   "  
            
        1Introduction The FC2000TX wireless audio/visual transmitter is a low power FM transmitter that operates in the 902 MHz to 928 MHz frequency band. The transmitter is designed as a component for OEM applications and is not intended for direct purchase by the end user. This manual describes the installation and operation of the device. 2Installation 2.1Housing Requirements The transmitter is small enough to be employed in hand held applications however it must be secured to protect against crushing or impact damage. The transmitter should be mounted so that the housing can be used as a heat sink or the housing must provide ventilation. The housing must allow the antenna to extend from the transmitter without bending and so that the antenna is not obstructed by metallic surfaces. 2.2Electrical Connections Electrical signals are connected to the transmitter through four color coded wires that pass through an EMI limiting ceramic toroid. The black wire is the ground reference for all signals. The red wire connects to a 12 VDC power source that can provide at least 250 mA peak current and 80 mA continuous current. The white wire connects to a high impedance audio signal source such as a piezo microphone. The yellow wire connects to a 75 ohm NTSC video source such as a keyhole video camera. The video bandwidth is 4 MHz. The unit must be operated with the factory installed antenna.             !   "  
            
       3Operation The transmitter provides no controls to the end user. It operates at a fixed frequency that is set at the factory. It begins transmitting as soon as 12 VDC is applied to the unit. The red wire may be connected to the 12 VDC power source through a switch that can be used to turn the unit on or off at will. Transmitter performance can be effected by metal surfaces near the antenna and by large physical structures. The transmitter should not be operated near medical equipment. The operator may assume that any restrictions to the use of cell phones also applies to the use of this transmitter. The transmitter complies with Part 15 of the FCC rules. Operation is subject to the restriction that the device does not cause harmful interference.

D:\Ready_To_Convert\Doc\145626.DOC Confidential - The information in this message is only intended for the person(s) or organization(s) to whom it is addressed. If you are not that person, please call the sender collect, and destroy this copy. Federal Communications Commission Washington D.C. Attention:Katherine Hawkins Applicant:CamLite Electronics Inc. FCC ID:O94FC2000TX EA100640 Ms. Hawkins: Thank you for your phone call on April 18, 2001. This letter authorizes you to revise Form 731 paragraph 8(a) to 915 MHz from 902 – 928 MHz. Test data for fundamental frequency of 915 MHz is as follows: Tuned, MHz = 915 Emission, MHz = 915 Level, dBμν/m @ 3 meters = 63.4 Correction Factor = 30.5 Total dBμν/m = 93.9 = 49.55 mν/m @ 3 meters Please see amended page 2 of the Test Report, which has been uploaded to the test report exhibit. We trust this now meets the requirements of the Commission and the Grant will be issued. Best Regards, Morton Flom, P. Eng., President M. Flom Associates, Inc. cc: Applicant cc: A2LA Corrective Action File

            
       Camlite Electronics, Inc FC2000TX Short Range Audio/Visual Transmitter Theory of Operation written by Roger Odle, BSEE © November 2, 2000 Camlite Electronics Inc. Snowflake; Arizona         
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        1Introduction The FC2000TX by Camlite Electronics, Inc. (CAMLITE) is a short range wireless audio/visual camera housed in a flashlight. It is a short range FM transmitter that operates in the 902 MHz to 928 MHz frequency band. 2Baseband Processing 2.1Video Signal The transmitter assembly accepts an NTSC encoded video signal on the yellow wire attached to E3. The video bandwidth of this signal is 4 MHz. The video input of the transmitter is terminated in 75 ohms. The video signal is coupled to the control input of the FM modulator by a passive network that includes potentiometer R101. R101 is adjusted to control the modulation factor of the transmitted signal. The input is DC blocked with a 1 uF capacitor to protect the FM modulator. 2.2Audio Signal The transmitter assembly accepts an audio signal on the white wire attached to E1. The audio signal amplitude modulates a 5.5 MHz local oscillator to create the sideband carrier signal that carries the audio information. The local oscillator is a series-mode negative resistance oscillator (Q5). The frequency is tuned by adjusting the slug in inductor T2. The oscillator output is buffered by amplifier Q4 then band limited by ceramic filter X1. The resulting signal is coupled to the FM modulator with a passive network. 3FM Modulator The FM modulator is a negative-resistance oscillator (Q3) with a pi resonator. A microstrip coupler is used as the inductive element of the resonator and to couple the output of the FM modulator to the power amplifier stage. The modulator is tuned by a voltage applied to varicap diode D1. The control signal from the synthesizer applied to this diode to control the output frequency. The audio and video signals are summed into the control signal of the synthesizer to FM modulate the carrier signal.         
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      " 4Synthesizer The synthesizer circuit (U2) contains a phase/frequency detector, a prescalar, a frequency divider, and a charge-pump output used to electronically tune the FM modulator. The registers of the synthesizer are programmed at startup with PIC microcontroller U1. The crystal oscillator of the microcontroller is used as the 4.00 MHz frequency reference for the synthesizer. The transmission frequency of the modulator is hardcoded into the firmware of the microcontroller. 5Power Amplifier The power amplifier consists of two cascaded common emitter amplifiers. A common bias current is used to set the operating point of both stages in order to reduce overall power consumption. The interstage coupling circuit reduces the low frequency gain of the transistor amplifiers to prevent saturation. The output of the power amplifier is coupled to the antenna and to the feedback input of the synthesizer chip with passive networks. 6Antenna The power amplifier is coupled to a monopole antenna with a series parallel network that has a low pass filter characteristic. This network attenuates harmonics of the fundamental carrier frequency. 7Shields The transmitter assembly is shrink wrapped with a non-conductive material then wrapped with aluminum foil. A copper braid connects the transmitter assembly to this outer shield at a single point. The battery wires and the audio and video wire exit the shield at the same location. All of these wires are threaded through a toroid bead to prevent conducted radiation from the FM modulator. The toroid is located no more than 0.25 inches from the place where the wires leave the shield. The antenna exits the shield along the edge of the transmitter assembly where it is laid along the inside of the FC2000 housing.         
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       8Power Supply The transmitter assembly accepts 12 VDC power through the red wire attached to E4. The ground reference for the transmitter assembly is the black wire attached to E5. The unit draws approximately 80 mA of current. A zener diode (D2) regulates the 5 VDC supplied to the microcontroller, synthesizer circuits, and the 5.5 MHz oscillator. All other circuits operate directly from 12 VDC.

            
       Camlite Electronics, Inc FC2000TX Short Range Audio Visual Transmitter Alignment Procedure written by Roger Odle, BSEE © November 2, 2000 Camlite Electronics Inc. Snowflake; Arizona         !   
            
        1Introduction The FC2000TX is a short range FM transmitter for broadcasting an audio/video signal designed for low power applications. This document describes the alignment and testing of the transmitter assembly. 1.1Equipment Table 1.1 Equipment List itemnamedescription 1RF Spectrum AnalyzerRange500 MHz to 4 GHZ Impedance50 Ohm Resolution BW3 KHz to 1 MHz Video BW100 Hz to 10 KHz 2Power Supply12 VDC 3RF Frequency CounterRange800 MHz to 1500 MHz 4Volt-Ohm-MeterVoltage Range0 VDC to 20 VDC 5Tuning Toolnon-conductive and non-ferromagnetic tuning tool 6Antenna900 MHz, 50 Ohm with 3 ft coax cable and 50 ft coax cable. 7Cablecoaxial cable, 50 ohm, BNC, length a/r 8A/V Receiver900 MHz Audio/Visual receiver, CCTV-900 (or equivalent) + 0monitor. 9FC2000 FixtureContains monochrome camera, microphone, provides power supply terminals for lab supply         !   
            
      " 2Alignment Procedure 2.1Setup 2.1.1Test fixture setup Turn off the lab supply. Connect the 12 VDC output of the lab supply to the test fixture. 2.1.2Do a quick ohm test for solder shorts. Clip the ground lead of the VOM to the ground lead of the transmitter assembly. Check for ground short at the locations listed in table 2.1. In particular, there is a higher that usual probability of a solder short occurring around the NE68139R transistors (Q1, Q2, Q3). Table 2.1 Ohm test locationdescriptionapproximate reading E4Power Supply, 12 VDC, 200 mA100 ohm 50 ohm or lower may indicate Q3 collector is shorted to Q3 emitter. D2-R26Zener 5 VDC regulator15 ohm Q3-R12VCO baseHigh-Z (5K+) 120 ohm if shorted to emitter Q2-R5Amplifier baseHigh-Z (1K+) 33 ohms if shorted to emitter Q2-R3 & Q2-R4Amplifier collectorR3 impedance should be different than R4. If not then there may be a collector to emitter short. Q1-C39 & Q1-C3Amplifier collectorC39 impedance should be different than C3. If not then there may be a collector to emitter short. Q1-R15 & Q1-C3Amplifier collectorR15 impedance should be different than C3. If not then there may be a base to emitter short. 2.1.3Power and audio/visual signals are applied to the transmitter assembly through wires that penetrate the shield. Table 2.2 shows the color code and location of each wire.         !   
            
      # Table 2.2 Wire Color Codes wire colordescriptionlocation REDPower Supply, 12 VDC, 200 mAE4 BLACKPower Supply, GroundE5 YELLOWVideoE2 WHITEAudioE1 Clip the test fixture leads to the UUT as follows: clip the camera lead to the yellow wire, clip the microphone lead to the white wire, clip the +12 VDC lead to the red wire, and clip the ground wire to the black lead. 2.1.4Solder wire antenna to E3. 2.2Basic Transmitter Alignment and Test This test verifies FM modulator VCO startup, frequency lock, and transmission power. 2.2.1Attach 50 ohm sense antenna to the spectrum analyzer with the three foot cable for bench testing. Remove the video clip and turn on the power to the transmitter assembly. 2.2.2Set the spectrum analyzer to view the 902 MHz to 928 MHz frequency band. Use the sense antenna to measure the near-field produced by the transmitter assembly. Verify that a strong constant wave (CW) signal appears at 914 MHz. You may observe the audio sidebands at this time. 2.2.3L6 is adjusted until maximum transmitted power is observed. Compress or expand the coils of L6 by pulling with a non-abrasive tuning tool. Make small changes then remove your hands and body from the area of the transmitter when measuring power. If the transmitted power is greater than +7 dBm then detune the coil so that the measured power is not greater than +7 dBm. The measured power should not be less than +5 dBm. Measure and record the final transmitted power on the test data sheet. 2.2.4Hold the antenna for the RF frequency counter in the near field of the transmitter assembly. Measure and record the transmission frequency on the test data sheet. The frequency should be 914 MHz ±100 KHz.         !   
            
      $ 2.3Audio Alignment and Test The audio signal is applied from a high impedance button microphone to the transmission assembly through a white wire connected to E1. This signal AM modulates a 5.5 MHz local oscillator that connects to the FM modulator. This causes the audio information to appear on the 5.5 MHz sidebands of the transmitted signal. 2.3.1Observe the transmitted signal on the spectrum analyzer. Set the span to 20 MHz so that the audio sidebands can be easily seen. Adjust the slug in inductor T1 until the power of each sideband is -7 dBc. Measure and record the final sideband power on the test datasheet. 2.4Video Alignment and Test A keyhole camera mounted in the lens cap of the flashlight assembly supplies a 4 MHz monochrome video signal to the transmitter assembly. The video signal is delivered through the yellow wire from the video camera assembly to wire point E2 on the transmitter assembly. 2.4.1Attach the camera to the yellow lead connected to E2. Turn on the transmitted unit and observe the spectrum spread as the carrier is FM modulated by the video signal. Adjust R101 until the main lobe of the RF spectrum is 10 MHz wide at the 3 dB points beyond the upper and lower band edges. Measure and record the final signal bandwidth. 2.4.2Turn off power and move the transmitted to the vertical transmission frame. Turn on the transmitted and observe the signal with the A/V recei…

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FCC ID: O94FC2000TX MFA p0060001, d0120017 Date: February 27, 2001 Submitted: April 12, 2001 Federal Communications Commission Via: Electronic Filing Attention: Authorization & Evaluation Division Applicant: Cam Lite Electronics Inc. Equipment: FC2000TX FCC ID: O94FC2000TX FCC Rules: 15.249 Gentlemen: On behalf of the Applicant, enclosed please find Application Form 731, Engineering Test Report and all pertinent documentation, the whole for approval of the referenced equipment as shown. Filing fees are attached. We trust the same is in order. Should you need any further information, kindly contact the writer who is authorized to act as agent. Sincerely yours, Morton Flom, P. Eng. enclosure(s) cc: Applicant MF/cvr FCC ID: O94FC2000TX MFA p0060001, d0120017 LIST OF EXHIBITS (FCCCERTIFICATION(TRANSMITTERS) - REVISED 9/28/98) APPLICANT: Cam Lite Electronics Inc. FCC ID: O94FC2000TX BY APPLICANT: 1. LETTER OF AUTHORIZATION x 2. IDENTIFICATION DRAWINGS xLABEL xLOCATION OF LABEL xCOMPLIANCE STATEMENT xLOCATION OF COMPLIANCE STATEMENT 3. DOCUMENTATION: 2.1033(b) (3) USER MANUAL x (4) OPERATIONAL DESCRIPTION x (5) BLOCK DIAGRAM x (5) SCHEMATIC DIAGRAM x (7) PHOTOGRAPHS x BLOCK DIAGRAM x PARTS LIST x ACTIVE DEVICES x 5. PARTS LIST BY M.F.A. INC. A. TESTIMONIAL & STATEMENT OF CERTIFICATION B. STATEMENT OF QUALIFICATIONS FCC ID: O94FC2000TX MFA p0060001, d0120017 TRANSMITTER CERTIFICATION of FCC ID: O94FC2000TX MODEL: FC2000TX to FEDERAL COMMUNICATIONS COMMISSION Rule Part(s) 15.249 DATE OF REPORT: February 27, 2001 ON THE BEHALF OF THE APPLICANT: Cam Lite Electronics Inc. AT THE REQUEST OF : P.O. 02072 Cam Lite Electronics Inc. P.O. Box 400 Snowflake, AZ 85937 Attention of: (877) 226-5483; (520) 536-3432; FAX: -5355 or -2133 Don Gonsalves, President Mike Sutton, Vice President SUPERVISED BY: Morton Flom, P. Eng. FCC ID: O94FC2000TX MFA p0060001, d0120017 THE APPLICANT HAS BEEN CAUTIONED AS TO THE FOLLOWING: 15.21 INFORMATION TO USER. The users manual or instruction manual for an intentional radiator shall caution the user that changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to operate the equipment. 15.27(a) SPECIAL ACCESSORIES. Equipment marketed to a consumer must be capable of complying with the necessary regulations in the configuration in which the equipment is marketed. Where special accessories, such as shielded cables and/or special connectors are required to enable an unintentional or intentional radiator to comply with the emission limits in this part, the equipment must be marketed with, i.e. shipped and sold with, those special accessories. However, in lieu of shipping or packaging the special accessories with the unintentional or intentional radiator, the responsible party may employ other methods of ensuring that the special accessories are provided to the consumer, without additional charge. Information detailing any alternative method used to supply the special accessories for a grant of equipment authorization or retained in the verification records, as appropriate. The party responsible for the equipment, as detailed in § 2.909 of this chapter, shall ensure that these special accessories are provided with the equipment. The instruction manual for such devices shall include appropriate instructions on the first page of text concerned with the installation of the device that these special accessories must be used with the device. It is the responsibility of the user to use the needed special accessories supplied with the equipment. FCC ID: O94FC2000TX MFA p0060001, d0120017 TABLE OF CONTENTS RULEDESCRIPTIONPAGE . Test Report 1 2.1033(c) General Information Required 2 . Standard Test Conditions and Engineering Practices 6 2.1053(a) Field Strength of Spurious Radiation 7 2.1049(c)(1) Emission Masks (Occupied Bandwidth) 14 FCC ID: O94FC2000TX MFA p0060001, d0120017 PAGE NO.1of18. Required information per ISO/IEC Guide 25-1990, paragraph 13.2: a) TEST REPORT b) Laboratory: (FCC: 31040/SIT) (Canada: IC 2044) M. Flom Associates, Inc. 3356 N. San Marcos Place, Suite 107 Chandler, AZ 85225 c) Report Number: d0120017 d) Client: Cam Lite Electronics Inc. P.O. Box 400 Snowflake, AZ 85937 e) Identification: FC2000TX FCC ID: O94FC2000TX Description: A/V Short Range Transmitter f) EUT Condition: Not required unless specified in individual tests. g) Report Date: February 27, 2001 EUT Received: June 1, 2000 h, j, k): As indicated in individual tests. i) Sampling method: No sampling procedure used. l) Uncertainty: In accordance with MFA internal quality manual. m) Supervised by: Morton Flom, P. Eng. n) Results: The results presented in this report relate only to the item tested. o) Reproduction: This report must not be reproduced, except in full, without written permission from this laboratory. FCC ID: O94FC2000TX MFA p0060001, d0120017 PAGE NO.2of18. LIST OF GENERAL INFORMATION REQUIRED FOR CERTIFICATION IN ACCORDANCE WITH FCC RULES AND REGULATIONS, VOLUME II, PART 2 AND TO 15.249 Sub-part 2.1033 (c)(1): NAME AND ADDRESS OF APPLICANT: Cam Lite Electronics Inc. P.O. Box 400 Snowflake, AZ 85937 MANUFACTURER: Applicant (c)(2): FCC ID: O94FC2000TX MODEL NO: FC2000TX (c)(3): INSTRUCTION MANUAL(S): PLEASE SEE ATTACHED EXHIBITS (c)(4): TYPE OF EMISSION: N/A (c)(5): FREQUENCY RANGE, MHz : 902 to 928 (c)(6): POWER RATING, Watts: 50 mV per meter @3 meters Switchable Variable x N/A (c)(7): MAXIMUM POWER RATING, Watts: 50x10 -3 V/meter@3m 15.203: ANTENNA REQUIREMENT: x The antenna is permanently attached to the EUT The antenna uses a unique coupling The EUT must be professionally installed The antenna requirement does not apply FCC ID: O94FC2000TX MFA p0060001, d0120017 PAGE NO.3of18. Subpart 2.1033(continued) (c)(8): VOLTAGES & CURRENTS IN ALL ELEMENTS IN FINAL R. F. STAGE, INCLUDING FINAL TRANSISTOR OR SOLID STATE DEVICE: COLLECTOR CURRENT, A = per manual COLLECTOR VOLTAGE, Vdc = per manual SUPPLY VOLTAGE, Vdc = 12 (c)(9): TUNE-UP PROCED…

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FCC ID: O94FC2000TX MFA p0060001, d0120017 PAGE NO.2 of 18. AMENDED April 19, 2001 LIST OF GENERAL INFORMATION REQUIRED FOR CERTIFICATION IN ACCORDANCE WITH FCC RULES AND REGULATIONS, VOLUME II, PART 2 AND TO 15.249 Sub-part 2.1033 (c)(1): NAME AND ADDRESS OF APPLICANT: Cam Lite Electronics Inc. P.O. Box 400 Snowflake, AZ 85937 MANUFACTURER: Applicant (c)(2): FCC ID: O94FC2000TX MODEL NO: FC2000TX (c)(3): INSTRUCTION MANUAL(S): PLEASE SEE ATTACHED EXHIBITS (c)(4): TYPE OF EMISSION: N/A (c)(5): FREQUENCY, MHz : 915 (c)(6): POWER RATING, Watts: 49.55 mV per meter @3 meters Switchable Variable x N/A (c)(7): MAXIMUM POWER RATING, Watts: 50x10 -3 V/meter@3m 15.203: ANTENNA REQUIREMENT: x The antenna is permanently attached to the EUT The antenna uses a unique coupling The EUT must be professionally installed The antenna requirement does not apply