DDE-STL-20W-950SSTL Transmitter

APPLICANT: BROADCAST ELECTRONICS INC. FCC ID: DDE-STL-20W-950S REPORT #: T:\B\BROADCAS\250U1\250U1TestReport.doc TABLE OF CONTENTS APPLICANT: BROADCAST ELECTRONICS INC. FCC ID: DDE-STL-20W-950S TABLE OF CONTENTS LIST TEST REPORT CONTAINING: PAGE 1........ GENERAL INFORMATION PAGE 2.........GENERAL INFO. CONT'D. AND RF POWER OUTPUT PAGE 3.........RF POWER TEST PROCEDURE & MODULATION CHARAC. PAGE 4.........AUDIO FREQUENCY RESPONSE GRAPH PAGE 5.........OCCUPIED BANDWIDTH PAGE 6-16......OCCUPIED BANDWIDTH PLOTS PAGE 17........ANTENNA CONDUCTED TEST DATA PAGE 18........RADIATED EMISSIONS TEST DATA PAGE 19........METHOD OF MEASURING RADIATED EMISSIONS PAGE 20........FREQUENCY STABILITY TEST DATA PAGE 21........EQUIPMENT LIST PAGE 22-24.....POWERLINE CONDUCTED DATA AND PLOTS PAGE 25-27.....MODULATION LIMITING CHARACTERISTIC PLOTS EXHIBITS CONTAINING: EXHIBIT 1.......FCC ID LABEL SAMPLE EXHIBIT 2.......SKETCH OF FCC ID LABEL LOCATION EXHIBIT 3.......BLOCK DIAGRAM EXHIBIT 4A-4H...SCHEMATIC EXHIBIT 5A-5E...TUNING PROCEDURE EXHIBIT 6A-6B...THEORY OF OPERATION EXHIBIT 7A-7D...USER'S MANUAL EXHIBIT 8.......TEST SET UP PHOTO EXHIBIT 9A......EXTERNAL PHOTO – FRONT VIEW EXHIBIT 9B......EXTERNAL PHOTO – REAR VIEW EXHIBIT 9C......INTERNAL PHOTOS – CHASSIS VIEW EXHIBIT 9D-9E...INTERNAL PHOTOS – SYNTHESIZER BOARD EXHIBIT 9F-9G...INTERNAL PHOTOS – AMPLIFIER BOARD EXHIBIT 9H-9I...INTERNAL PHOTOS – METER BOARD EXHIBIT 9J-9K...INTERNAL PHOTOS – AUDIO PROCESSING BOARD EXHIBIT 9L-9M...INTERNAL PHOTOS – POWER SUPPLY EXHIBIT 10A-10C.SPECIFICATION SHEET EXHIBIT 11......TEST SET UP PHOTO - CONDUCTED APPLICANT: BROADCAST ELECTRONICS INC. FCC ID: DDE-STL-20W-950S REPORT #: T:\B\BROADCAS\250U1\250U1TestReport.doc Page 1 of 27 GENERAL INFORMATION REQUIRED FOR TYPE ACCEPTANCE 2.1033 BROADCAST ELECTRONICS INC. will manufacture the FCC ID: DDE-STL-20W-950S in quantity, for use under FCC RULES PART 74.501, AURAL BROADCAST AUXILIARY STATIONS. 2.1033 (C4) TECHNICAL DESCRIPTION (1) Type of Emission: 20K0F3E, 40K0F3E, 194KF3E, 80K0F8E, 280KF8E, 490KF8E Bn = 2M + 2DK M = 20000 D = 22 kHz (Peak Deviation) K = 1 Bn = 2(20K) + 2(22K)(1) = 84K ALLOWED AUTHORIZED BANDWIDTH = up to 500 kHz. 74.502(b)(1) (2) Frequency Range: 944-952 MHz TEST FREQ: 950 MHz. (3) Power Range and Controls: UNIT has no controls. (4) Maximum Output Power Rating: 20 Watts into 50 ohms resistive load. (5) DC Voltages and Current into Final Amplifier: FINAL AMPLIFIER ONLY Vce = 13.5 Volts Ice = 2.6 A 2.1033 (C.10)(7) Complete Circuit Diagrams: The circuit diagram is included as EXHIBIT’S 4A-4E. The block diagram is included as EXHIBIT # 3. (8) Instruction book. The instruction manual is in- cluded as Exhibit 7A-7C. (9) Tune-up procedure. The tune-up procedure is given In Exhibit # 5A-5E. (10) Description of all circuitry and devices provided for determining and stabilizing frequency. See Exhibit 6A-6B. (11) Description of any circuits or devices employed for suppression of spurious radiation, for limit- ing modulation, and for limiting power. APPLICANT: BROADCAST ELECTRONICS INC. FCC ID: DDE-STL-20W-950S REPORT #: T:\B\BROADCAS\250U1\250U1TestReport.doc Page 2 of 27 This circuitry is described in Exhibits 6A-6B. Limiting Modulation: The transmitter audio circuitry is contained in IC1, IC2 and IC3. The deviation is adjustable depending on the setting of R63. Limiting Power: The power output is adjusted by R74. (12) Digital modulation. This unit does not use digital modulation. 2.983(e) The data required by 2.1046 through 2.1057 is sub- mitted below. 2.1046 RF power output. RF power was measured with a RF Wattmeter. OUTPUT POWER: 20 Watts or +43 dBm. APPLICANT: BROADCAST ELECTRONICS INC. FCC ID: DDE-STL-20W-950S REPORT #: T:\B\BROADCAS\250U1\250U1TestReport.doc Page 3 of 27 APPLICANT: BROADCAST ELECTRONICS INC. FCC ID: DDE-STL-20W-950S R.F. POWER OUTPUT TEST PROCEDURE Transmitter 50 ohm under test Watt Meter Audio Oscillator 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 on the next page. The audio signal was fed into a dummy microphone circuit and into the microphone connector. The input required to produce 30 percent modulation level was measured. 2.1047(b) Audio_input_versus_modulation The audio input level needed for a particular per- percentage of modulation was measured in accor- dance with TIA/EIA Specification 603. The audio input curves versus modulation are shown in exhibits 9A - 9C. Curves are provided for audio input frequen cies of 300, 1000, and 15000 Hz. MODULATION LIMITING CHARACTERISTICS SEE PAGES 25-27 AUDIO LOW PASS FILTER An audio low pass filter is not used in this unit. APPLICANT: BROADCAST ELECTRONICS INC. FCC ID: DDE-STL-20W-950S REPORT #: T:\B\BROADCAS\250U1\250U1TestReport.doc Page 4 of 27 Broadcast Electronics Inc. DDE-STL-20W-950S -2 -1 0 1 2 3 4 100100010000100000 Frequency dBm audio response APPLICANT: BROADCAST ELECTRONICS INC. FCC ID: DDE-STL-20W-950S REPORT #: T:\B\BROADCAS\250U1\250U1TestReport.doc Page 5 of 27 2.1049 Occupied bandwidth: Data in the plots show that all sidebands between 50 & 100% fo the authorized bandwidth are attenuated by at least 25dB. From 100 to 250% of the authorized band- width they are attenuated by at least 35dB and beyond 250% 43 log(Po) dB. The plot show 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. OCCUPIED BANDWIDTH MEASUREMENT Transmitter 50 ohm under test Coupler Resistive Load Audio Spectrum Oscillator Analyzer Test Equipment Setup APPLICANT: BROADCAST ELECTRONICS INC. FCC ID: DDE-STL-20W-950S REPORT #: T:\B\BROADCAS\250U1\250U1TestReport.doc Page 6 of 27 PAGE 6 APPLICANT: BROADCAST ELECTRONICS INC. FCC ID: DDE-STL-20W-950S REPORT #:…

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