2ASVO05B-73FM transmitter

CZERF CZE-05B FM transmitter Please read this manual before you use the device, restore the manual carefully in case you’ll need it in the future. 1 Thanks for buying the CZE-05B portable FM transmitter. Before you use this transmitter for the first time,please read the user manual carefully and operate the device following the instructions. It is multi-functional device but easy to operate. We sincerely hope our products will bring you happy experience. 1. Attention before use 1) Only professional engineers can do the repair work. 2) Don’t power on the transmitter without connecting the antenna. 3) Don’t use the transmitter in explosive environment.(such as gas station, natural gas or steam) 4) Don’t put the transmitter in extreme dusty, damp or hot places. 5) Please use the transmitter following the local regulations. 6) Please try not to use the transmitter in thunder/storm weather. 2. Main Characteristics: 1) High-fidelity high stability: Motherboard is adopted by next-generation integrated NC FM stereo radio transmitter chip the BH1415 from Japan ROHM Company, built-in PLL frequency PLL, audio pre-emphasis, limiter and low pass filter circuit to achieve high fidelity, high stability signal transmission 2) Stereo clear sound: the control panel is consisted of AT89C2051 and AT24C02; after the stage by two 2SC3355 and one 2SC2053 total of three power amplifier to ensure that the three-dimensional sound quality output effect 3) Good shielding: Structure design closely, not because of external signal induction frequency drift 4) Excellent heat dissipation: The stability of the chassis using high quality aluminum alloy material, lightweight and excellent heat dissipation can work continuously to ensure that equipment 2 5) Easy to use: Panel use LCD to display the transmission frequency, according to the identification of the interface to connect to other hardware, easy to adjust and it is intuitive 6) Switching power: 100mW and 500mW power can be switched to use 7) Switching frequency: Can arbitrarily set from 76M to 108M range from 86M to 90M 95M to 108M, 87M to 108M 8) This subsection is with a microphone and volume control 3.Circuit Principle: Stereo audio via 3.5 mm interface input, after the adjustment of the potentiometer control input to BH1415 internal, internal after pre-emphasis circuit, limiting circuit and low-pass filter circuit and by 13, 14 feet again after access to the 7.6 MHz crystal vibration frequency oscillation circuit through 200 points after the 38 KHZ subcarrier signal, and 38 KHZ subcarrier by 2 points in the frequency of 19 KHZ pilot signal modulation.Firstly, the audio signal and the 38KHz subcarrier signal are balanced modulated by a multiplexer to produce a main signal (L+R) and a 38KHz subcarrier signal (L-R) modulated by DSB, and then the composite signal with the 19KHz pilot signal is output from the 5th leg.The microphone audio is also input by another 3.5mm interface, and after audio amplification, it is combined with the composite signal output from the 5th pin. The two channels are directly modulated by a high-frequency oscillator composed of a variogram diode.Frequency control by touch the key and the MCU control the internal PLL circuit to stabilize the transmission frequency.After two stages of power amplification, the transmitting frequency generates 800MW power output, which is then filtered out by a low-pass filter composed of LC and transmitted to the antenna for transmission.The MCU then transmits the current transmission frequency information to the user in real time through the LCD display module. 4. Main Specifications: 3 NO. Product name specification quantity 1 Host machine CZE-05B 1 2 antenna Rubber antenna 1 3 Power adapter DC12V/1.67A 1 4 Audio cable 3.5mm audio cable 1 5 manual e-instruction manual 1 4 5. All configurations NO. project 1 working voltage 11~13V DC 2 working current <300mA 3 frequency domain 76~108Mhz 4 frequency stability ±10PPM 5 stepped frequency 100KHZ 6 The operating temperature of the environment -10°C~50°C 7 output impedance 50Ω 8 Rf power output range H:500mW (L:100mW) 9 Harmonic and noise radiation ≤-60dB 10 audio distortion <0.3% 11 frequency response 20HZ~15000HZ 12 Preemphasis delay 50us 13 degree of separation ≥40 dB 14 input level ≤-10dBV 15 Modulation frequency deviation ±75KHZ 16 SNR(Signal to Noise Ratio) ≥65 dB 17 Machine Size 113*88*38mm 18 Machine weight 269g 5 6. Operation Instruction: 6 7.Power Adjustment The transmitter output power is divided into two files: high power transmission (H) = 500 mw; Low power (L) = 100 mw Shut off power adapter, operate according to the following steps under transmitter power line cut off condition. 1) Press 【】 and don’t let go, then connect power(DC12V connected to transmitter),loosen the key after 3 seconds. Then into power adjustment status, LCD displays “L” or “H”(picture default as H high power transmission) 2) Press key【▲】, set it high power file (H). 3) Press key【▼】, set it low power file (L). 4) Select the power file you need, press key【】again, power setting completed and it automatically into frequency range setting interface. 8.Frequency Range Setting 1) 1.Frequency band high-end setting: after frequency setting, press key【】 and into frequency range setting status, LCD displays 108MHz, this 1 Audio input volume adjustment 2 The 3.5 mm audio input hole 2 The power switch button 4 Increasing the frequency button 5 Frequency decrease buttons 6 The microphone input hole 3.5 mm interface 7 The microphone input volume adjustment 8 display 9 The 12V 1.67A power supply interface 10 TNC antenna interface 7 frequency is high-end of working frequency band.(High-end frequency defaulted as 108.00MHz). Through keys【▲】【▼】to adjust the frequency you need to set. 2) Frequency band low-end setting: frequency band high-end setting completed, press key【】and it will into frequency band low-end setting, LCD displays 76.00 Mhz. This frequency band is the low-end frequency,(low-end…

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Agent Authorization Company: Guangzhou Chuanzhou Electronic Technology Co., Ltd. Address: 2/F (Building C-1), No. 3, Chuangye 2nd Road, Guandao Village, Shapu, Xintang Town, Zengcheng, Guangzhou City, China Product Name: FM transmitter Model Number(s): CZE-05B, SIGNSTEK ST-05B Product Description: FM transmitter We authorize MiCOM Labs Inc., 575 Boulder Court, Pleasanton, California 94566, USA, to act on our behalf on all matters concerning the certification of above named equipment. We declare that MiCOM Labs Inc. is allowed to forward all information related to the approval and certification of equipment to the regulatory agencies as required and to discuss any issues concerning the approval application. Any and all acts carried out by MiCOM Labs on our behalf shall have the same effect as acts of our own. Signature: Date: 2020-07-16 Name: Anne Hu Company: Guangzhou Chuanzhou Electronic Technology Co., Ltd.

July 24, 2020 Office of Engineering Technology Federal Communications Commission 7435 Oakland Mills Road Columbia, MD 21046 USA Subject: Explanation of differences between product types FCC ID : 2ASVO05B-73 Model Number: CZE-05B, SIGNSTEK ST-05B To Whom It May Concern: We, The Guangzhou Chuanzhou Electronic Technology Co., Ltd. hereby declare that the model : SIGNSTEK ST-05B is identical with the model : CZE-05B, except the model name. Except for the different above, no other modification is performed. Sincerely, Signature: Guangzhou Chuanzhou Electronic Technology Co., Ltd. Contact person: Anne Hu

Office of Engineering Technology Federal Communications Commission 7435 Oakland Mills Road Columbia, MD 21046 USA Date: 2020-07-15 Subject; Request for Confidentiality FCC ID: 2ASVO05B-73 To Whom It May Concern, Pursuant to the provisions of the Commission’s rules Title 47 Sections §0.457 and §0.459, we are requesting the Commission to withhold the following attachment(s) as confidential documents from public disclosure indefinitely. These documents contain detailed system and equipment descriptions and are considered as proprietary information in operation of the equipment. The public disclosure of these documents might be harmful to our company and would give competitors an unfair advantage in the market. Schematic Diagram Block Diagram Parts List Operational Description Tune-up Procedure In additional to above mentioned documents, in order to comply with the marketing regulations in Title 47 CFR §2.803 and the importation rules in Title 47 CFR §2.1204, while ensuring that business sensitive information remains confidential until the actual marketing of newly authorized devices, we request Short Term Confidentiality of the following attachment(s); External Photos Test Setup Photos Internal Photos User Manual For 45 days, pursuant to Public Notice DA 04-1705. OR For 180 days pursuant to KDB 726920 D01. It is our understanding that all measurement test reports, FCC ID label format and correspondence during the certification review process cannot be granted as confidential documents and this information will be available for public review once the grant of equipment authorization is issued. Sincerely, Guangzhou Chuanzhou Electronic Technology Co., Ltd. Contact person: Anne Hu

External Photos WHOLE VIEW OF EUT TOP VIEW OF EUT BOTTOM VIEW OF EUT FRONT VIEW OF EUT BACK VIEW OF EUT LEFT VIEW OF EUT RIGHT VIEW OF EUT PORT VIEW OF EUT-1 PORT VIEW OF EUT-2 ADAPTER VIEW OF EUT

FCC ID Label Location Size 40mm*20mm FCC ID: 2ASVO05B-73

Internal Photos OPEN VIEW OF EUT Antenna INTERNAL VIEW OF EUT-1 INTERNAL VIEW OF EUT-2 INTERNAL VIEW OF EUT-3 INTERNAL VIEW OF EUT-4 INTERNAL VIEW OF EUT-5 INTERNAL VIEW OF EUT-6 INTERNAL VIEW OF EUT-7 INTERNAL VIEW OF EUT-8 INTERNAL VIEW OF EUT-9

RF EXPOSURE EVALUATION 1. TEST RESULT CERTIFICATION Applicant Guangzhou Chuanzhou Electronic Technology Co., Ltd. Address 2/F, No.3 Chuangye Second Road, Guan Dao village, Shapu, Xintang Town. Zengcheng District, GuangZhou, China. manufacturer Guangzhou Chuanzhou Electronic Technology Co., Ltd. Address 2/F, No.3 Chuangye Second Road, Guan Dao village, Shapu, Xintang Town. Zengcheng District, GuangZhou, China. Factory Guangzhou Chuanzhou Electronic Technology Co., Ltd. Address 2/F, No.3 Chuangye Second Road, Guan Dao village, Shapu, Xintang Town. Zengcheng District, GuangZhou, China. Product Designation: FM transmitter Brand Name: CZERF Test Model: CZE-05B FCC ID: 2ASVO05B-73 Date of Test: Jun. 16, 2020 to July 14, 2020 2. TECHNICAL INFORMATION A major technical description of EUT is described as following: Operation Frequency 87.9MHz-91.9MHz Modulation FM Antenna Designation Dedicated Antenna Antenna type External antenna Hardware Version V2.0 Software Version V2.0 Output power 0.8W Antenna gain 1.3dBi Power Supply DC 12V by adapter 3. RF EXPOSURE MEASUREMENT 3.1 INTRODUCTION Human exposure to RF emissions from mobile devices (47 CFR §2.1091) may be evaluated based on the MPE limits adopted by the FCC for electric and magnetic field strength and/or power density, as appropriate, since exposures are assumed to occur at distances of 20 cm or more from persons. The 1992 ANSI/IEEE standard (See Listed limit table) specifies a minimum separation distance of 20 cm for performing reliable field measurements to determine adherence to MPE limits. If the minimum separation distance between a transmitter and nearby persons is more than 20 cm under normal operating conditions, compliance with MPE limits may be determined at such distance from the transmitter. When applicable, operation instructions and prominent warning labels may be used to alert the exposed persons to maintain a specified distance from the transmitter or to limit their exposure durations and usage conditions to ensure compliance. 3.2 FCC LIMITS FOR MAXIMUM PERMISSIBLE EXPOSURE (MPE) Note: 1. f= Frequency in MHz * Plane-wave Equivalent Power Density 2.The averaging time for General Population/Uncontrolled exposure to fixed transmitters is not applicable for mobile and portable transmitters. See 47 CFR §§2.1091 and 2.1093 on source-based time-averaging requirement for mobile and portable transmitters. 4. CLASSIFICATION OF THE ASSESSMENT METHODS S=PG/4πR² Where: S=power density P=power input to antenna G=power gain of the antenna in the direction of interest relative to an isotropic radiator R=distance to the center of radiation of the antenna Limit : GENERAL POPULATION / UNCONTROLLED EXPOSURE Occupational/Controlled Exposure 5. EUT OPERATION CONDITION Make the EUT to transmit at Bottom channel, Middle channel and Top channel individually. 6. TEST RESULTS Antenna Gain=1.3 dBi (Numeric 1.35), π=3.141, R=20cm Frequency Output Power Tune-up Power Tune-up Power Power Density Power Density Limit Result MHz dBm dBm mW mW/cm 2 mW/c m 2 Pass/Fail 91.9 29.028 29.2 831.8 0.223 1.0 Pass Note: 1.The output power is refer to AGC10636200601FE04. 2. Only the worst result was recorded in this part.

Page 1 of 50 FCC Test Report Report No.: AGC10636200601FE04 FCC ID : 2ASVO05B-73 APPLICATION PURPOSE : Original Equipment PRODUCT DESIGNATION : FM transmitter BRAND NAME : CZERF MODEL NAME : CZE-05B, SIGNSTEK ST-05B APPLICANT : Guangzhou Chuanzhou Electronic Technology Co., Ltd. DATE OF ISSUE : July 14, 2020 STANDARD(S) : FCC Part 73 Subpart D REPORT VERSION : V1.0 Attestation of Global Compliance (Shenzhen) Co., Ltd CAUTION: This report shall not be reproduced except in full without the written permission of the test laboratory and shall not be quoted out of context. Report No.: AGC10636200601FE04 Page 2 of 50 REPORT REVISE RECORD Report Version Revise Time Issued Date Valid Version Notes V1.0 / July 14, 2020 Valid Initial Release Report No.: AGC10636200601FE04 Page 3 of 50 TABLE OF CONTENTS 1. VERIFICATION OF CONFORMITY ............................................................................................................... 5 2. GENERAL INFORMATION ............................................................................................................................ 6 2.1. PRODUCT DESCRIPTION ..................................................................................................................... 6 3. MEASUREMENT UNCERTAINTY ................................................................................................................. 7 4. DESCRIPTION OF TEST MODES ................................................................................................................. 8 5. SYSTEM TEST CONFIGURATION ............................................................................................................... 9 5.1. CONFIGURATION OF EUT SYSTEM ..................................................................................................... 9 5.2 EQUIPMENT USED IN TESTED SYSTEM ............................................................................................... 9 5.3. SUMMARY OF TEST RESULTS .............................................................................................................. 9 6. TEST FACILITY ........................................................................................................................................... 10 7. OUPUT POWER .......................................................................................................................................... 11 7.1. TEST LIMIT ............................................................................................................................................ 11 7.2. MEASUREMENT PROCEDURE ............................................................................................................ 11 7.3. TEST SETUP ......................................................................................................................................... 12 7.4. TEST RESULT ....................................................................................................................................... 13 8. MODULATION CHARACTERISTICS .......................................................................................................... 15 8.1 TEST LIMIT ............................................................................................................................................ 15 8.2 MEASUREMENT METHOD ................................................................................................................... 15 8.3. TEST SETUP ......................................................................................................................................... 15 8.4 TEST RESULT ........................................................................................................................................ 16 9. OCCUPIED BANDWIDTH ........................................................................................................................... 18 9.1. TEST LIMIT ........................................................................................................................................... 18 9.2. MEASUREMENT PROCEDURE ........................................................................................................... 18 9.3. TEST SET-UP ........................................................................................................................................ 18 9.4. MEASUREMENT RESULTS .................................................................................................................. 19 10. FREQUENCY STABILITY .......................................................................................................................... 24 10.1. TEST LIMIT ......................................................................................................................................... 24 10.2. MEASUREMENT PROCEDURE ......................................................................................................... 24 10.3. TEST SET-UP ...................................................................................................................................... 25 Report No.: AGC10636200601FE04 Page 4 of 50 10.4. TEST RESULT ..................................................................................................................................... 25 11. EMISSION MASK AND SPURIOUS EMISSIONS ..................................................................................... 26 11.1. TEST LIMIT .......................................................................................................................................... 26 11.2. MEASUREMENT PROCEDURE ......................................................................................................... 26 11.3. TEST SETUP ....................................................................................................................................... 27 11.4. TEST RESULT ....................................................................................…

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Report No.: AGC10636200601FE04 Page 41 of 50 APPENDIX B: PHOTOGRAPHS OF EUT WHOLE VIEW OF EUT TOP VIEW OF EUT Report No.: AGC10636200601FE04 Page 42 of 50 BOTTOM VIEW OF EUT FRONT VIEW OF EUT Report No.: AGC10636200601FE04 Page 43 of 50 BACK VIEW OF EUT LEFT VIEW OF EUT Report No.: AGC10636200601FE04 Page 44 of 50 RIGHT VIEW OF EUT PORT VIEW OF EUT-1 Report No.: AGC10636200601FE04 Page 45 of 50 PORT VIEW OF EUT-2 OPEN VIEW OF EUT Antenna Report No.: AGC10636200601FE04 Page 46 of 50 INTERNAL VIEW OF EUT-1 INTERNAL VIEW OF EUT-2 Report No.: AGC10636200601FE04 Page 47 of 50 INTERNAL VIEW OF EUT-3 INTERNAL VIEW OF EUT-4 Report No.: AGC10636200601FE04 Page 48 of 50 INTERNAL VIEW OF EUT-5 INTERNAL VIEW OF EUT-6 Report No.: AGC10636200601FE04 Page 49 of 50 INTERNAL VIEW OF EUT-7 INTERNAL VIEW OF EUT-8 Report No.: AGC10636200601FE04 Page 50 of 50 INTERNAL VIEW OF EUT-9 ADAPTER VIEW OF EUT ----END OF REPORT----

Test Setup Photos RADIATED EMISSION TEST SETUP