BZB51BTWIRELESS MICROPHONE TX

2) Circuit explanation a) Frequency stabilization This is a synthesizer oscillation system and its frequency stability depends on its character of crystal vibrator. The crystal used in this model is guaranteed of its frequency allowance within lOppm (temperature -lOC to +60C). b) Spurious suppression In order to suppress the spurious, we put a filter (LC type) after the power amplification. This is a pi-type double low pass filter. c) Modulation limit There is a limitter circuit (organized by diodes) after AF low pass filter to control a modulation.

1. Voltage and Current at RF section

APPLICANT: AZDEN CORPORATION FCCID: BZB51BT REPORT #: A\AZDEN\614AUT3\614AUT3TestReport.doc Page #: TABLE OF CONTENTS APPLICANT: AZDEN CORPORATION FCC ID: BZB51BT TABLE OF CONTENTS LIST TEST REPORT CONTAINING: PAGE 1.........GENERAL INFORMATION & TECHNICAL DESCRIPTION PAGE 2.........TECHNICAL DESCRIPTION CONT. & RF OUTPUT PAGE 3.........AUDIO FREQUENCY RESPONSE GRAPH MODULATION LIMITING – 300 Hz PAGE 4.........MODULATION LIMITING PLOT – 2500 MODULATION LIMITING PLOT - 15000 PAGE 5.........AUDIO LOW PASS FILTER OCCUPIED BANDWIDTH PAGE 6.........SPURIOUS EMISSIONS AT ANTENNA TERMINALS (CONDUCTED) RADIATED EMISSIONS TEST DATA & TEST PROCEDURE PAGE 7.........METHOD OF MEASURING RADIATED EMISSIONS PAGE 8.........FREQUENCY STABILITY TEST DATA PAGE 9-12......EQUIPMENT LIST EXHIBITS CONTAINING: EXHIBIT 1.......LABEL SAMPLE EXHIBIT 2.......LABEL LOCATION EXHIBIT 2.......BLOCK DIAGRAM EXHIBIT 3.......SCHEMATIC EXHIBIT 4.......PARTS LIST EXHIBIT 5.......USES MANUAL EXHIBIT 6.......EXTERNAL PHOTOGRAPHS EXHIBIT 7.......INTERNAL PHOTOGRAPHS EXHIBIT 8.......OPERATIONAL DESCRIPTION EXHIBIT 9.......TUNING PROCEDURE EXHIBIT 10......TEST SET UP PHOTOGRAPH APPLICANT: AZDEN CORPORATION FCCID: BZB51BT REPORT #: A\AZDEN\614AUT3\614AUT3TestReport.doc Page #: 1 of 12 GENERAL INFORMATION REQUIRED FOR TYPE ACCEPTANCE 2.1033(c)(1) AZDEN CORPORATION will manufacture the 51BT in 2.1033(c)(2) quantity, for use under FCC RULES PART 74.801, LOW POWER AUXILIARY STATIONS. AZDEN CORPORATION 1-12-17 Kami-Renjaku Mitaka, Japan 2.1033 TECHNICAL DESCRIPTION (c)(3) Instruction book. The instruction manual is in- cluded as Exhibit 5. (c)(4) Type of Emission: 30K0F3E Bn = 2M + 2DK M = 4000 D = 11kHz(Peak Deviation) K = 1 Bn = 2(4k) + 2(11k)(1) = 30k ALLOWED AUTHORIZED BANDWIDTH = 200kHz. 74.861(e)(5) (c)(5) Frequency Range: Part 74: 793-806 MHz TEST FREQ = 799.40 MHz. (c)(6) Power Range and Controls:UNIT has no controls. (c)(7) Maximum Output Power Rating: .017 Watts into 50 ohms resistive load. (c)(8) DC Voltages and Current into Final Amplifier: FINAL AMPLIFIER ONLY 9.0V BATTERY Vce = 9.0 Volts Ice = 28 mA. (c)(9) Tune-up procedure. The tune-up procedure is given in EXHIBIT 9. (c)(10) Complete Circuit Diagrams: The circuit diagram is included as EXHIBIT # 4. The block diagram is included as EXHIBIT #3. APPLICANT: AZDEN CORPORATION FCCID: BZB51BT REPORT #: A\AZDEN\614AUT3\614AUT3TestReport.doc Page #: 2 of 12 2.1033(c)11) Photo or Drawing of Label and sketch of location: See EXHIBIT # 1-2. 2.1033(c)12) Photos of Equipment: See EXHIBIT #'S 6-7. (c)(13) Description of all circuitry and devices provided for determining and stabilizing frequency. Description of any circuits or devices employed for suppression of spurious radiation, for limit- ing modulation, and for limiting power. This circuitry is described on EXHIBIT 8. Limiting Modulation: The transmitter audio circuitry is contained in IC101, IC102 and IC103. Limiting Power: There is no provision for limiting power. (13) Digital modulation. This unit does not use digital modulation. 2.1033(c)(14) The data required by 2.1046 through 2.1057 is sub- mitted below. 2.1046 RF power output. RF power measured is: OUTPUT POWER: .017 WATTS R.F. POWER OUTPUT TEST PROCEDURE Transmitter 50 ohm under test Watt Meter Audio Oscillator APPLICANT: AZDEN CORPORATION FCCID: BZB51BT REPORT #: A\AZDEN\614AUT3\614AUT3TestReport.doc Page #: 3 of 12 2.1047(a)(b) Modulation characteristics: AUDIO FREQUENCY RESPONSE The audio frequency response was measured in accordance with TIA/EIA Specification 603. The audio frequency response curve is shown below. Audio Frequency Response -5 -4 -3 -2 -1 0 1 2 3 4 5 100100010000 Frequency Hz Attenuation dB MODULATION LIMITING – 300 Hz Modulation Limiting 0 2000 4000 6000 8000 10000 12000 -100-80-60-40-200 mV Deviation 300 APPLICANT: AZDEN CORPORATION FCCID: BZB51BT REPORT #: A\AZDEN\614AUT3\614AUT3TestReport.doc Page #: 4 of 12 MODULATION LIMITING – 2.5 k Modulation Limiting 0 2000 4000 6000 8000 10000 12000 -100-80-60-40-200 mV Deviation 2500 MOULATION LIMITING – 15 k Modulation Limiting 0 2000 4000 6000 8000 10000 12000 -100-80-60-40-200 mV Deviation 15000 APPLICANT: AZDEN CORPORATION FCCID: BZB51BT REPORT #: A\AZDEN\614AUT3\614AUT3TestReport.doc Page #: 5 of 12 AUDIO LOW PASS FILTER The audio low pass filter is not required in this unit. 2.1049(c) Occupied Bandwidth: Data in the plots show that all sidebands between 50 & 100% for the authorized bandwidth are attenuated by at least 25dB. From 100 to 250% of the authorize3d band- width they are attenuated by at least 35dB and beyond 250% 43 log(Po) dB. The plot shows the transmitter modulated with 15000 Hz(the highest modulation frequen- cy), adjusted for 50% modulation plus 16 dB. The spectrum analyzer was set with the unmodulated carrier at the top of the screen. The test procedure diagram and occupied bandwidth plots follow. Wireless Microphone transmitter: Test procedure diagram OCCUPIED BANDWIDTH MEASUREMENT Transmitter Coupler 50 ohm under test Resistive Load Audio Spectrum Oscillator Analyzer REQUIREMENT: PART 74: 200kHz EMISSION BANDWIDTH. OCCUPIED BANDWIDTH APPLICANT: AZDEN CORPORATION FCCID: BZB51BT REPORT #: A\AZDEN\614AUT3\614AUT3TestReport.doc Page #: 6 of 12 2.1051 Spurious emissions at antenna terminals(conducted): Not Applicable no antenna connector. 2.1053(a)(b) Field strength of spurious emissions: NAME OF TEST: RADIATED SPURIOUS EMISSIONS REQUIREMENTS: Emissions must be 43 +10log(Po) dB below the mean power output of the transmitter. 43 + 10 log(0.017) = 25.30 dB TEST DATA: Emission Frequency (MHz) Polarity Ant. Corrected EUT Signal Reading (dBm) Coax Loss Sub. Ant. DB Below Carrier (dBc) 799.4 H 12.4 0 0 0 1,598.90 V -22.4 1.1 4.99 30.91 2,398.40 V -28.1 1.2 5.24 36.46 3,197.90 H -22.9 1.35 7.02 29.63 3,997.40 H -39.1 1.4 7.5 45.4 4,796.80 H -37.4 1.5 8.29 43.01 5,596.30 H -38.4 1.7 8.61 43.89 6,395.80 H -33.5 1.9 9.12 38.68 7,195.30 H -43.9 2 7.87 50.43 7,994.80 V -44.2 2 8.98 49.62 METHOD OF ME…

Text truncated - open the document above for the full version.