POSEF623788MHz-108MHz FM Transmitter

Product Introduction EF6237 LCD FM transmitter, a high quality product that adopted advanced PLL technology, stable frequency, crisp sound, has 198 transmitting channel. Unique streamline appearance, smart, user-friendly. When you travel outside or stay at home with it, beautiful music will always surround you, with royal enjoyment. Function Introduction 1、 Searching-channel Function, The button UP and DOWN, searching and fixing available transmitting channel between 88.1~107.9MH Z; 2、 E-switch Function, with delayed function of starting or shutting after a second. 3、 Lighting-indication Function, the LED will shut off automatically after a few seconds to save energy. 4、 Alternative function: switchable automatically between battery and car power,(EF-6211 can only be powered by car charger) 5、 Memory Function, when restarting, the unit can memorize your last channel used before. Technical Parameter 1、 Working Conditions： Environment Temperature：-5~+45°C， 2、Major technical Specs： Working Voltage：3V； Working Current：50mA±5mA； Working Channel：88.1~107.9MH Z Receiving Distance：About 5 meters Installation Instruction and Caution 1、 Insert 2 AAA batteries, or connect the unit to the car charger power(3V), pay attention to the right direction of “+＂“-＂pole. If you want to change the power from battery to car power, please shut off the unit`s power firstly. 2、 Please insert the audio connector directly to the audio output or earphone jack. 3、 Please take out the batteries if not using the unit for long time. 4、 Avoid high temperature, humidity and dust, and avoid using chemical solution to clean the unit, please clean it with soft-wet wipe. Operation Instruction： 1、 Insert 2AAA batteries or connect to its DC jack with a 3V car adaptor from car power. 2、 Insert the audio connector into the audio output or earphone jack of MP3、CD、MD、IPOD player. 3、 Press the power button“M”1 second to start it. 4、 Press the searching channel button“+”or“-”to search your favorite channel. If you keep on pressing the button, the channel will skip fast. 5、 “88.1 When the channel indicates “88.1 MH Z ”, if you press the button “-”, it will skip to“107.9MH Z ”.but the channel will not be stable untill a few seconds, and vice versa. 6、 When you fix a channel, turn on your MP3、CD、MD、IPOD player, and then tune your radio channel to match the channel of the unit, you will hear the music played from your player. 7、 If you hear noisy or unclear sound from radio, please switch the channel to another one, which had better is not occupied by the local station. Warning: Changes or modifications to this unit not expressly approved by the party responsible for compliance could void the user’s authority to operate the equipment. Note: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures: —Reorient or relocate the receiving antenna. —Increase the separation between the equipment and receiver. —Connect the equipment into an outlet on a circuit different from that to which the receiver is connected. —Consult the dealer or an experienced radio/TV technician for help. This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interface, and (2) This device must accept any interface received , including interference that may cause undesired operation.

                       !  !     "" #$ %  & '(   )'*+' ,+'  - .  / 0/112 34 "5 . BH1415F Audio ICs z zz zBlock diagram Shift register MPX RF OSC RF GND PLL V CC GND V CC LPF LPF Program counter MUTE Phase detector + 4 1 2 1 50 1 19 1 2 V CC + + − − Pre-emphasis and Limiter 1234567891011 2221201918171615141312 L-ch INPUTPRE-EMPHASIS TIME CONSTANTLPF TIME CONSTANTPILOT SIGNAL ADJUSTAUDIO MUTINGDATACLOCKCHIP ENABLEX'tal OSCILLATORX'tal OSCILLATORPLL V CC R-ch INPUT PRE-EMPHASIS TIME CONSTANT LPF TIME CONSTANT FILTER COMPOSITE SIGNAL OUTPUT GND PLL PHASE DETECTOR OUTPUT V CC RF OSCILLATOR RF GND RF OUTPUT

Wilson Loke ES-HKG From: Generic Office of Engineering Te chnology [oetech@ fccsun27w.fcc.gov] Sent: Tuesday, April 03, 2007 3:39 AM To: [email protected] Subject: Response to Inquiry to FCC (Tracking Number 734609) 4/3/2007 Inquiry: FCC ID: POSEF6237 The EUT is a FM transmitter un der 15.239 from 88.1MHz to 107 .9MHz. Since its operating fr equency is from 88.1MHz to 107.9MHz witin the band of 88MHz to 108M Hz with the fundamental field streng th less than 48dBuV/ m at 3m, it is consider fall in the scope of Category 1-15.239 FM transmitter. The test procedure plan is listed in the following: i) Radiated emission ii)Bandwidth test 1) How does this device operate? The device is operated as 88.1MHz to 107.9MHz FM transmitter an d powered by 3.0Vdc through two AAA batteries or 3Vdc/12Vdc ca r adaptor. It transmit the audio signal from a external audio source such as MP3 player by a FM transmitter tuned from 88.1 MHz to 107.9MHz and the audio s ignal can be received by a common FM Broadcasting Radio which is tuned to same transmitted frequency of the FM transmitter and regenerate the transmitted signal through the FM Broadcasting Radio. 2) Provide information on the device and its antenna. The device is a simple audio FM transmitter tuned from 88.1MHz to 107.9MHz to transm it an audio source, for example, MP3 playe r, to a FM Broadcasting Radio. The antenna is an integral long wire antenna. The block diagram, circuit diagram and internal photo are provided 3) How is it installed? It is very easy to install. It is powered by two AAA batteries or 3V/12V car adaptor . Before active the device, it is connecte d the audio input socket to the external audio source such as MP3 player. And then, switching on the device and the FM Broadcas ting Radio. And then, playing th e audio from the external audio source (MP3 player) Tuning the FM br oadcasting radio to the frequencies which do not occupied by other FM broadcasted cha nnel. After that, tuning the FM transmitter to that freqnency, the audio signal from the external audio source will be heard. 4) What test procedure was used? A NCI C63.4:2003. 5) If tested in a car, how was it configured/tested? For the Car adaptor, we connected the Car ad aptor and the 12V car battery and then put the EUT on a 0.8m height turntable 3m fr om antenna. The adaptor, MP3 player and EUT with 10cm separated distance. The test configuration photo is attached for your reference. 6) Was the tuning range properly verified? The test lab should in dicate in the report that the tuning controls were manually ad justed to verify maximum tuning range. Yes. The tuning range is from 88.1MHz to 107.9M Hz. The tuning controls were manually adjusted. 7) Was the bandwidth properly tested with maximum audio input? The maximum output Level of the typica l device, ipod mp3 player is used. 8) Use a typical audio file from typical device 4/3/2007 A typical audio file (pop music) from a typical device (mp3 player) are used. 9) Provide the test report Provided. Response: Looks good to me. Do not reply to this mess age. Please select the Reply to an Inquiry Response link from the OET In quiry System to add any additional information pe rtaining to this inquiry. 4/3/2007

External Photos

Label Label Size: 25mm×8mm

Internal Photos

Antenna Photos Antenna Antenna

Block diagram introduction Audio signal is input the limiter of IC through Pre-emphasis net, after being dealed with by the built-in limiter, it is sent to the mpx Compound Unit, simultaneity, the signal produced by CRYSTAL（7.6M） gets stereo transmitting signal after being divided channel, then is sent to the mpx Compound Unit and gets compound signal which is dealed with mpx, the compound signal is sent into “osc modulater” to modulate the carrier wave signal produced by osc, after magnified by RF, then is sent to the in-built antenna to transmit signal. The PLL circuit is made up of “mcu”、”shift register”、“program counter”、 phase detecter”, through locking the user`s selected channel, the “key button” produce touched-pulse data to turn on or off power and adapt channel, “LCD” is used to indicate the channel, FM, MHz, power ect., the button “power” refers to supplying stable power to MCU and transmitter. BH1415F Audio ICs Wireless Audio Link IC BH1415F The BH1415F is a FM stereo transmitter IC that transmits simple configuration. The IC consists of a stereo modulator for generating stereo composite signals and a FM transmitter for broadcasting a FM signal on the air. The stereo modulator generates a composite signal which consists of the MAIN, SUB, and pilot signal from a 38kHz oscillator. The FM transmitter radiates FM wave on the air by modulating the carrier signal with a composite signal. z zz z Applications CD changer, Car TV, Car navigation, Wireless speakers, Personal computer (sound board), Game machine z zz zFeatures 1) It is possible to improve the timbre because it has the pre-emphasis circuit, limiter circuit, and the low-pass filter circuit. 2) Built-in pilot-tone system FM stereo modulator circuit. 3) The transmission frequency is stable because it has a PLL system FM transmitter circuit. 4) PLL data input (CE, CK, DA) by serial input. z zz z Absolute maximum ratings (Ta = 25°C, In measurement circuit.) Supply voltage Power dissipation Storage temperature Data input voltage Phase comparator output voltage ∗ Derating : 4.5mW/°C for operation above Ta=25°C. ParameterSymbolLimitsUnit V CC Pd Tstg V V V mW °C +7.0 −0.3~V CC+0.3 −0.3~V CC+0.3 −55~+125 Conditions V IN-D VOUT-P 450 Pin8,12 Pin15,16,17,18 Pin7 ∗ z zz zRecommended operating conditions (Ta = 25°C) Audio input level ParameterSymbol Min. Unit V CCV V V °C 4.0 −40 − Conditions V IN-A fIN-A Topr t PRE fTX VIH VIL 20 − 70 0.8V CC GND Max. 6.0 +85 −10 15k 155 120 V CC 0.2VCC Typ. − − − − − − − − dBV Hz μsec MHz Pin8,12 Pin1,22 Pin1,22 Pin2,21 Pin9,11 Pin15,16,17,18 Pin15,16,17,18 Operating supply voltage Operating temperature Audio input frequency band Pre-emphasis time constant set up range Transmission frequency Control terminal "H" level input voltage Control terminal "L" level input voltage BH1415F Audio ICs z zz zBlock diagram Shift register MPX RF OSC RF GND PLL V CC GND V CC LPF LPF Program counter MUTE Phase detector + 4 1 2 1 50 1 19 1 2 V CC + + − − Pre-emphasis and Limiter 1234567891011 2221201918171615141312 L-ch INPUTPRE-EMPHASIS TIME CONSTANTLPF TIME CONSTANTPILOT SIGNAL ADJUSTAUDIO MUTINGDATACLOCKCHIP ENABLEX'tal OSCILLATORX'tal OSCILLATORPLL V CC R-ch INPUT PRE-EMPHASIS TIME CONSTANT LPF TIME CONSTANT FILTER COMPOSITE SIGNAL OUTPUT GND PLL PHASE DETECTOR OUTPUT V CC RF OSCILLATOR RF GND RF OUTPUT BH1415F Audio ICs z zz z Pin descriptions Pin No. 1 Pin descriptions R-ch audio source input terminal L-ch audio source input terminal It cuts DC with the capacitor and it inputs R-ch audio signal. It cuts DC with the capacitor and it inputs L-ch audio signal. DC (V) 1 2 V CC 1 2 V CC 1 2 V CC 1 2 V CC 1 2 V CC 1 2 V CC 1 2 V CC 22 2,21 Pre-emphasis time constant terminal It connects a capacitor for the time constant of pre-emphasis. Equivalent circuit 8 6 8 6 8 6 4 22 1 or 21 2 or 20 3 or 43k 1k 100k 50k 50k 50p 22.7k 3,20 LPF time constant terminal This is 15kHz LPF. It connects a 150pF capacitor. 100k100k − + 4 Filter terminal It is a ripple filter for the reference voltage of the audio part. 5 6 7 8 Composite signal output terminal It connects to the FM modulator. 8 5 6 8 7 6 GND GND − − PLL phase detector output terminal It connects to the PLL LPF circuit. − Power supply terminal V CC τ = 22.7kΩ × C BH1415F Audio ICs Equivalent circuitPin descriptionsPin No. 9 10 11 RF oscillator terminal DC (V) 4 7 V CC 8 9 10 12 13,14 15 16 17 18 19 12 18 17 16 15 6 RF GND GND − − − − This is the base terminal of the colpitts oscillator. It connects time constant of the oscillation. 25k 40k 30p 2p 18p 12 1413 6 8 11 10 RF transmission output terminal It connects to the antenna through BPF. VCC −1.9 PLL power supply terminal V CC X'tal oscillator terminal It connects a 7.6MHz crystal oscillator. 4k 1M Chip enable terminal The terminal to make high level in serial data input. The clock which takes data and synchronization in serial data input. Clock input terminal Data input terminal The input terminal of the serial data which is forwarded from the controller Audio mute terminal 0.8V CC ≤ Pin18 : Mute ON 0.2V CC ≥ Pin18 : Mute OFF Pilot signal adjust terminal 8 19 6 or or or 1 2 V CC 5k BH1415F Audio ICs z zz zElectrical characteristics (Unless otherwise noted Ta = 25°C, V CC = 5.0V, Signal source : f IN = 400Hz) ParameterSymbol I Q142028mA Min.Typ.Max.UnitConditions Measurement circuit Fig.1 Fig.2 Fig.2 Fig.3 Fig.3 Fig.3 Fig.3 Fig.3 Fig.3 Fig.6 Fig.7 Fig.7 Fig.7 Fig.7 Fig.8 Fig.8 Fig.4 Fig.5 Quiescent current Channel separation Sep2540 − − − − −− − − − − − −− − dB dB dB dBV dB dB dBμV Total harmonic distortion "off" level leak current1 "off" level leak current2 "H" level input current "H" level output voltage "L" level output voltage "L" level input current Channel balance Input output gain Pilot modulation rate Sub carrier rejection ratio Pre-emphasis time constant Limiter input level LPF cut off frequency Mute attenuation volume Transmission output level THD C.B Gv M P SCR τ PRE VIN(LIM) fC(LPF) VO(MUTE) VTX IIH IIL VOH VO…

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Test Set Up Photo Radiated Emissions