H38WT-203PWIRELESS MICROPHONE TRANSMITTER

TABLE OF CONTENTS LIST APPLICANT: SEKAKU ELECTRON INDUSTRY CO., LTD. FCC ID: H38WT-203P TEST REPORT: PAGE 1......COVER SHEET - GENERAL INFORMATION & TECHNICAL DESCR. PAGE 2......TECHNICAL DESCRIPTION CONTINUED AND RF POWER OUTPUT PAGE 3......RF POWER OUTPUT CONTD. & MODULATION CHARACTERISTICS PAGE 4......OCCUPIED BANDWIDTH PAGE 5......FIELD STRENGTH OF SPURIOUS EMISSIONS PAGE 6......METHOD OF MEASURING RADIATED SPURIOUS EMISSIONS PAGE 7......FREQUENCY STABILITY PAGE 8......CERTIFICATION OF TECHNICAL DATA PAGE 9......LIST OF TEST EQUIPMENT EXHIBITS: EXHIBIT 1.........POWER OF ATTORNEY LETTER EXHIBIT 2.........FCC ID LABEL SAMPLE AND SKETCH OF LOCATION EXHIBIT 3A........EXTERNAL FRONT & REAR VIEW PHOTOGRAPH EXHIBIT 3B........EXTERNAL SIDE VIEW PHOTOGRAPH EXHIBIT 3C........EXTERNAL TOP VIEW PHOTOGRAPH EXHIBIT 3D........INTERNAL COMPONENT SIDE PHOTOGRAPH EXHBIIT 3E........INTERNAL SOLDER SIDE PHOTOGRAPH EXHIBIT 4.........BLOCK DIAGRAM EXHIBIT 5.........SCHEMATIC EXHIBIT 6A-6E.....PARTS LIST EXHIBIT 7A-7D.....CRYSTAL SPECIFICATION EXHIBIT 8A-8G.....USER'S MANUAL EXHIBIT 9.........OCCUPIED BANDWIDTH PLOT - NO TONE EXHIBIT 10........OCCUPIED BANDWIDTH PLOT - 2500 Hz TONE EXHIBIT 11........OCCUPIED BANDWIDTH PLOT - 15 kHz TONE EXHIBIT 12A.......MODULATION LIMITING PLOT - 300 Hz EXHIBIT 12B.......MODULATION LIMITING PLOT - 1000 Hz EXHIBIT 12C.......MODULATION LIMITING PLOT - 3000 Hz EXHIBIT 12D.......AUDIO FREQUENCY RESPONSE PLOT APPLICANT: SEKAKU ELECTRON INDUSTRY CO., LTD. FCC ID: H38WT-203P DATE: AUGUST 27, 1999 REPORT #: F:\CUS\S\SEK\SEK316T9\SEK316T9.RPT PAGE: TABLE OF CONTENTS GENERAL INFORMATION REQUIRED FOR TYPE ACCEPTANCE 2.983 (a,b,c) SEKAKU ELECTRON INDUSTRY CO., LTD. will manufacture the H38WT-203P in quantity, for use under FCC RULES PART 74.801, LOW POWER AUXILIARY STATIONS. 2.983 (d) TECHNICAL DESCRIPTION (1) Type of Emission: 150KF3E Bn=2M+2DK M = 1000 D = 60.0KHz (Peak Deviation) K=1 Bn = 2(1K) + 2(60.0K)(1) = 2K +120.0K = 122.0KHz M = 15,000 D = 60KHz K=1 Bn = 2(15K) + 2(60K) = 30 +120 = 150KHz 74.861(e)(5) ALLOWED AUTHORIZED BANDWIDTH = 200KHz. (2) Frequency Range: Part 74: 161.625-161.775 & 174-216MHz TEST FREQ = 174.10MHz. (3) Power Range and Controls:UNIT has no power controls. (4) Maximum Output Power Rating: 2.0 MilliWatts ERP. (5) DC Voltages and Current into Final Amplifier: FINAL AMPLIFIER ONLY 9.0V BATTERY Vce = 8.9 Volts Ice = 1.6mA. (6) Function of each electron tube or semiconductor device or other active circuit device: SEE EXHIBIT #: 6A-6E 2.983(d) (7) Complete Circuit Diagrams: The circuit diagram is included as EXHIBIT 5. The block diagram is included as EXHIBIT 4. The part list is included EXHIBIT 6A-6E. DATE: AUGUST 27, 1999 REPORT #: F:\CUS\S\SEK\SEK316T9\SEK316T9.RPT PAGE: 1 2.983(d) (8) Instruction book. The instruction manual is in- cluded as last item in this report. (9) Tune-up procedure. The tune-up procedure is given in page . (10) Description of all circuitry and devices provided for determining and stabilizing frequency. The transmitter frequency is controlled by a crystal, the crystal specifications are included in PAGE 7A-7E. (11) Description of any circuits or devices employed for suppression of spurious radiation, for limit- ing modulation, and for limiting power. There are no devices or circuitry to limit the power, since this is a low power device. The interstage cou- pling between TR1, TR2, TR3, TR4, and TR6 as well as the low pass filter made up of L2, VC1, C26, L3, VC2, C28, L4, L6, VC3, & C29 suppress the harmonics. Limiting Modulation: The transmitter audio circuitry is contained in IC2. The modulation limiting is also provided by IC1B. Limiting Power: There is no provision for limiting power. (12) Digital modulation. This unit does not use digital modulation. 2.983(e) The data required by 2.985 through 2.997 is sub- mitted below. 2.985(a) RF_power_output. ERP was measured by the method described later in this report. The input power to the final stage was measured with a 9.0V supply connected in place of the 1.5V battery. INPUT POWER: FOR 9.0 V OPERATION (8.9V)(0.0016A) = 14.3milliWatts OUTPUT POWER: FOR 9.0 V OPERATION 4.0 mWATTS ERP APPLICANT: SEKAKU ELECTRON INDUSTRY CO., LTD. FCC ID: H38WT-203P DATE: AUGUST 27, 1999 REPORT #: F:\CUS\S\SEK\SEK316T9\SEK316T9.RPT PAGE: 2 R.F. POWER OUTPUT /-------\ /-----------------\ | | | | TRANSMITTER | | | |HP | UNDER TEST WITH | \--| |SPECTRUM | INTERNAL ANTENNA| | | |ANALYZER \-----------------/ | | | | | \-------/ |?- 3.0 meters---?| /-------------\ | SIGNAL | DIPOLE | Tuned, Calibrated | GENERATOR | ANTENNA | Antenna which may | |----------/ be raised from 1 \-------------/ to 4 meters above ground and changed in polarization Equipment placed 1 meter above ground on a rotatable platform. The center of the Dipole antenna at the center of the platform and the output of the signal generator adjusted to produce the same meter reading as measured for the fundamental in the radiated emissions test. 2.987(a)(b) Modulation characteristics: AUDIO FREQUENCY RESPONSE The audio frequency response was measured in accordance with TIA/EIA Specification 603 S2.2.6.2.1. with the follwoing excep- tions; Constant Deviation Test /---------------\ /----------\ /----------\ | Dummy | | Audio | | RMS | /-| Microphone |--| Generator| /-| VOLTMETER| | | | \----------/ | \----------/ | \---------------/ | |----------------------------------/ | /------------\ /------------\ /---------\ | | | | | | | | Test | | | Transmitter|---/ \----| NEAR FIELD|---| Receiver| \-| under test | | PROBE | | | \------------/ \------------/ \---------/ 1.The test receiver audio bandwidth was <50Hz to >20,000Hz. 2. Apply a 1000Hz tone and adjust the audio generator to produce 10% of the rated system deviation. 3. Measure frequency responce over the frequency range from 100Hz to 20,000Hz. The audio frequency response curve is shown on the next page. AUDIO LOW PASS FILTER The audio low pass filter is not required in this unit. REPORT #: F:\CUS\S…

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Modulation Limiting Sekaku Electron Ind., Co., LTD. H38WT-203PT 0 10000 20000 30000 40000 50000 60000 70000 00.10.20.30.40.5 rms Volts Deviation 300 Hz SEKAKU ELECTRON INDUSTRY CO., LTD. FCC ID: H38WT-203P EXHIBIT # 12A

Modulation Limiting Sekaku electron Ind., Co., LTD. H38WT-203PT 0 10000 20000 30000 40000 50000 60000 70000 00.20.40.60.8 rms Volts Deviation 1000 Hz SEKAKU ELECTRON INDUSTRY CO., LTD. FCC ID: H38WT-203P EXHIBIT # 12B

Modulation Limiting Sekaku Electron Ind., Co., LTD. H38WT-203PT 0 10000 20000 30000 40000 50000 60000 70000 00.0050.010.0150.02 rms Volts Deviation 3000 Hz SEKAKU ELECTRON INDUSTRY CO., LTD. FCC ID: H38WT-203P EXHIBIT # 12C

Sekaku Electron Ind., Co., LTD. H38WT-203PT 0 0.5 1 1.5 2 2.5 3 3.5 4 05000100001500020000 Frequency rms mVolts audio response SEKAKU ELECTRON INDUSTRY CO., LTD. FCC ID: H38WT-203P EXHIBIT # 12D

Modulation Limiting Sekaku Electron Industry Co., LTD. H38WT-203PT 0 100000 200000 300000 400000 500000 00.050.10.150.2 rms Volts Deviation 15000 Hz