SWFDKW-DUOWireless Microphone

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Federal Communications Commission 7435 Oakland Mills Road Columbia, MD 21046 Gentlemen: This letter is to comply with Section 0.457 and 0.459 pertaining to confidential material. { Enping Hengda Electronic Industry Co., Ltd. } would like the following documents regarding this submission for FCC ID: { SWFDKW-DUO } to be kept confidential. 1. Schematics diagram. The above material contains trade secrets or technical data, which would customarily be guarded from competitors. We do not want these documents to be accessible to the general public. Sincerely, Enping Hengda Electronic Industry Co., Ltd. Company Manager:Wuyongfeng 2005-11-9

THEORY OF OPERATION 1、 Switch on the power , then all the components are on power . 2、 Audio signals are acquired from the MIC . 3、 Carrier Frequency are produced by PLL . 4、 Carrier Frequency are controlled by CPU. 5、 Audio signals are modulated on PLL . 6、 The modulated signal will be amplified . 7、 The amplified signal will be transmitted to the air by the transmitting antenna . PDF 文件以 "pdfFactory Pro" 试用版创建 www.pdffactory.com

Value Modality NumberValueModalityNumber 10RR1.231uC1.12 100RR1.214u7C1.258 680RR1.2110uC1.12 1KR22 100u C5.34 2K2R113T5LXQ2 4K7R1.226T5LXQ1 10KR1.279T5LXQ1 20KR2110R/6mmR1.21 47KR1.21 4148/6mm R1.21 56KR1.246mmJ62 150KR211815TO-924 470KR214148D2A1 1PC229014TO-921 5PC219018TO-922 20PC219V1D11 22PC31H10TO-921 33PC32LED lamp holder1 47PC21T33T321 68PC21T70T701 101C22T76T97751 102C3531101IC-16A1 103C38TLC1.11 331C32503VR11 5/8Pc2113/14T5-5.11 10/8PC22 33/27PC21 1uHLX82XXTAL1 2.2uHLX82SWSW1 4.7uHLX81 part list

CHINA CEPREI ( HEADQUARTERS ) LABORATORY REPORT NO: GD05100067 FCC ID:SWFDKW-DUO DATE: 11/02/2005 Page 3 Rev. 00 Ta b l e o f C o n t e n t s 1. GENERAL INFORMATION .............................................4 2. SYSTEM TEST CONFIGURATION .............................................6 3. SUMMARY OF TEST RESULTS .............................................9 4. DESCRIPTION OF TEST MODES ..............................................9 5. MAXIMUM TRANSMITTER POWRE ..........................................10 6. MODULATION CHARACTERISTICS ..........................................13 7. FREQUENCY TOLERANCE .........................................21 8. EMISSION BANDWIDTH ...........................................25 9. UNWANTED RADIATION .............................................28 APPENDIX 1 PHOTOGRAPHS OF SETUP ..............................................34 CHINA CEPREI ( HEADQUARTERS ) LABORATORY REPORT NO: GD05100067 FCC ID:SWFDKW-DUO DATE: 11/02/2005 Page 6 Rev. 00 2. System Test Configuration 2.1 EUT Configuration The EUT configuration for testing is installed on RF field strength measurement to meet the Commission’s requirement and operating in a manner which intends to maximize its emission characteristics in a continuous normal application. 2.2 EUT Exercise The Transmitter was operated in the normal operating mode. the TX frequency was fixed which was for the purpose of the measurements. 2.3 GENERAL TECHNICAL REQUIREMENTS a). Section 74.861 (e) - 1: Maximum transmitter power less than 50mW b). Section 74.861 (e) - 3: Peak Frequency Deviation less than 75 KHz c). Section 74.861 (e) - 4: Frequency Tolerance less than 0.005% d). Section 74.861 (e) - 5: Emission Bandwidth shall less than 200KHz e). Section 74.861 (e) - 6: Unwanted radiation According to Section 74.861 (e) – 6, the mean power of emission shall be attenuated below the mean output power of the transmitter in accordance with the following schedule: 1). 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. 2). At least 35 dB on any frequency removed from the center of the authorized bandwidth by more than 100% up to and including 250% of the authorized bandwidth. 4). At least 43 + 10 log 10 (T) dB on any frequency removed from the center of the authorized bandwidth by more than 250%. CHINA CEPREI ( HEADQUARTERS ) LABORATORY REPORT NO: GD05100067 FCC ID:SWFDKW-DUO DATE: 11/02/2005 Page 7 Rev. 00 2.4 Configuration of Tested System Fig. 2-1 Configuration of Tested System EUT CHINA CEPREI ( HEADQUARTERS ) LABORATORY REPORT NO: GD05100067 FCC ID:SWFDKW-DUO DATE: 11/02/2005 Page 9 Rev. 00 3. SUMMARY OF TEST RESULTS FCC Rules Description Of Test Result Carrier Power Compliant Frequency Deviation Compliant Frequency Tolerance Compliant Operating Bandwidth Compliant Unwanted Radiation Compliant 4. DESCRIPTION OF TEST MODES The EUT (Wireless Microphone) has been tested under normal operating condition. Three channels ( the top one-212.105 MHz, the middle one-195.803 MHz and the bottom one-176.805 MHz) have been chosen for testing. CHINA CEPREI ( HEADQUARTERS ) LABORATORY REPORT NO: GD05100067 FCC ID:SWFDKW-DUO DATE: 11/02/2005 Page 10 Rev. 00 5. MAXIMUMN TRANSMITTER POWER 5.1 PROVISIONS APPLICABLE According to FCC Part 74 Section 74.861(e) – 1: The power of the measured unmodulated carrier power at the output of the transmitter power amplifier may not exceed 50mW 5.2 MEASUREMENT PROCEDURE 1). On a test site, the EUT shall be placed on a turntable, and in the position closest to the normal use as declared by the user. 2). The test antenna shall be oriented initially for vertical polarization located 3m from the EUT to correspond to the transmitter. 3). The output of the antenna shall be connected to the measuring receiver and either a peak or quasi-peak detector was used for the measurement as indicated on the report. The detector selection is based on how close the emission level was approaching the limit. 4). The transmitter shall be switched on; if possible, without the modulation and the measurement receiver shall be tuned to the frequency of the transmitter under test. 5). The test antenna shall be raised and lowered through the specified range of height until the measuring receiver detects a maximum signal level. 6). The transmitter shall than be rotated through 360in the horizontal plane, until the maximum signal level is detected by the measuring receiver. 7). The test antenna shall be raised and lowered again through the specified range of height until the measuring receiver detects a maximum signal level. 8). The maximum signal level detected by the measuring receiver shall be noted. 9). Replace the antenna with a proper Antenna (substitution antenna). 10). The substitution antenna shall be oriented for vertical polarization and, if necessary, the length of the substitution antenna shall be adjusted to correspond to the frequency of transmitting. 11). The substitution antenna shall be connected to a calibrated signal generator. 12). If necessary, the input attenuator setting of the measuring receiver shall be adjusted in order to increase the sensitivity of the measuring receiver. 13). The test antenna shall be raised and lowered through the specified range of the height to ensure that the maximum signal is received. CHINA CEPREI ( HEADQUARTERS ) LABORATORY REPORT NO: GD05100067 FCC ID:SWFDKW-DUO DATE: 11/02/2005 Page 11 Rev. 00 14). The input signal to substitution antenna shall be adjusted to the level that produces a level detected by the measuring receiver, that is equal to the level noted while the transmitter radiated power was measured, corrected for the change of input attenuation setting of the measuring receiver. 15). The input level to the substitution antenna shall be recorded as power level in dBm, corrected for any change of input attenuator setting of the measuring receiver. 16). The measurement shall be r…

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CHINA CEPREI ( HEADQUARTERS ) LABORATORY REPORT NO: GD05100067 FCC ID:SWFDKW-DUO DATE: 11/02/2005 Page 35 Rev. 00 Radiated Emission Setup Photo