BSYWT-1132 Way Walkie Talkie

TABLE OF CONTENTS APPLICANT: GMT INDUSTRIAL LTD. FCC ID: BSYWT-113 TEST REPORT: PAGE 1.............TEST PROCEDURE PAGE 2.............TEST PROCEDURE CONTD. AND CIRCUIT DESCRIPTION PAGE 3.............49.86MHz Tx RADIATION INTERFERENCE TEST DATA PAGE 4.............49.405MHz Tx RADIATION INTERFERENCE TEST DATA PAGE 5.............OCCUPIED BANDWIDTH EXHIBITS: EXHIBIT 1...........POWER OF ATTORNEY LETTER EXHIBIT 2...........BLOCK DIAGRAM EXHIBIT 3A-3B.......SCHEMATIC EXHIBIT 4A-4B.......PARTS LIST EXHIBIT 5...........USERS MANUAL EXHIBIT 6...........SAMPLE OF FCC ID EXHIBIT 7...........SKETCH OF FCC ID EXHIBIT 8...........FRONT VIEW EXTERNAL PHOTOGRAPH EXHIBIT 9...........REAR VIEW EXTERNAL PHOTOGRAPH EXHIBIT 10..........INTERNAL COMPONENT SIDE PHOTOGRAPH EXHIBIT 11..........INTERNAL COPPER SIDE PHOTOGRAPH EXHIBIT 12..........OCCUPIED BANDWIDTH CW - 49.40 MHz EXHIBIT 13..........OCCUPIED BANDWIDTH LOUD VOICE - 49.40 MHz EXHIBIT 14..........OCCUPIED BANDWIDTH CW - 49.86 MHz EXHIBIT 15..........OCCUPIED BANDWIDTH LOUD VOICE - 49.86 MHz F:\CUS\G\GMT\GMT72H8.RPT APPLICANT: GMT INDUSTRIAL LTD. FCC ID: BSYWT-113 TEST EQUIPMENT LIST 1. Spectrum Analyzer: Hewlett Packard 8566B, with preselector HP 85685A, & Quasi-Peak Adapter HP 8565OA, & HP 8449B OPT H02 Cal. 9/30/97 2. Eaton Biconnical Antenna Model 94455-1 20-200 MHz Serial No. 0997 Cal. 9/17/97 3. Electro-Metric Dipole Kit, 20-1000 MHz, Model TDA 25 cal. 5/15/97 4. Electro-Metric Horn 1-18 GHz, Model RGA-180, Cal. 9/24/97 5. Electro-Metric Antennas Model TDS-25-1, TDS-25-2, 9/3/97 6. Electro-Metric Line Impedance Stabilization Network Model No. EM-7821, Serial No. 101; 100KHz-30MHz 50uH. 9/30/97 7. Electro-Metric Line Impedance Stabilization Network Model No. EM-7820, Serial No. 2682; 10KHz-30MHz 50uH. 9/30/97 TEST PROCEDURE GENERAL: This report shall NOT be reproduced except in full without the written approval of TIMCO ENGINEERING, INC. RADIATION INTERFERENCE: The test procedure used was ANSI STANDARD C63.4-1992 using a HEWLETT PACKARD spectrum analyzer with a prese- lector. The bandwidth of the spectrum analyzer was 100 kHz with an appropriate sweep speed. The analyzer was calibrated in dB above a microvolt at the output of the antenna. The resolution bandwidth was 100KHz and the video bandwidth was 300KHz. The ambient temperature of the UUT was 95oF with a humidity of 47%. FORMULA OF CONVERSION FACTORS: The Field Strength at 3m was estab- lished by adding the meter reading of the spectrum analyzer (which is set to read in units of dBuV) to the antenna correction factor sup- plied by the antenna manufacturer. The antenna correction factors are stated in terms of dB. The gain of the Preselector was accounted for in the Spectrum Analyzer Meter Reading. Example: Freq (MHz) METER READING + ACF = FS 33 20 dBuV + 10.36 dB = 30.36 dBuV/m @ 3m POWER LINE CONDUCTED INTERFERENCE: The procedure used was ANSI STAN- DARD C63.4-1992 using a 50uH LISN. Both lines were observed. The bandwidth of the spectrum analyzer was 10kHz with an appro- priate sweep speed. The ambient temperature of the UUT was 95oF with a humidity of 47%. APPLICANT: GMT INDUSTRIAL LTD. FCC ID: BSYWT-113 REPORT #: F:\CUS\G\GMT\GMT72H8.RPT PAGE #: 1 TEST PROCEDURES CONTINUED APPLICANT: GMT INDUSTRIAL LTD. FCC ID: BSYWT-113 ANSI STANDARD C63.4-1992 10.1.7 MEASUREMENT PROCEDURES: The unit under test was placed on a table 80 cm high and with dimensions of 1m by 1.5m. The table used for radiated measurements is capable of continuous rotation. When an emission was found, the table was rotated to produce the maximum signal strength. At this point, the antenna was raised and lowered from 1m to 4m. The antenna was placed in both the horizontal and vertical planes. The situation was similar for the conducted measurement except that the table did not rotate. The EUT was setup as described in ANSIC63.4-1992 with the EUT 40 cm from the vertical ground wall. CIRCUIT_DESCRIPTION: When Unit A is turned on it transmits on 49.86MHz. The signal comes in from the antenna through T9 to the double tuned circuit to Q4, the output stage of the transmitter. The frequency is generated by crystal controlled oscillator Q8. The transmitted signal is amplitude modulated by means of the microphone. The audio signal is fed into Q3 the preamplifier and then to Q2. Q2 drives the audio transformer that varies the current to the oscillator Q8. The received signal on 49.405MHz comes from the antenna to the doubled tuned circuit T10 and then to Q1 the mixer. The IF output of Q1 is coupled to a double tuned circuit and then to U1. U1 provides IF amplification and detection of the signal. The audio output of U1 is coupled the the audio stages Q11, Q12 & Q13. The Q12/Q13 drive the speaker. When Unit B is turned on it transmits on 49.405MHz and receives on 49.86MHz. This frequency again serves as both the transmitter carrier and the receiver Local Oscillator. This signal provides low side injection to produce a 455 kHz IF from an incoming 49.86 MHz. signal. ANTENNA_AND_GROUND_CIRCUITRY This unit makes use of a short, helical antenna. The antenna is inductively coupled. The antenna is self contained, no provision is made for an external antenna. This unit is powered from a 9.0V battery. No ground connection is provided. The unit relies on the ground track of the printed circuit board. APPLICANT: GMT INDUSTRIAL LTD. FCC ID: BSYWT-113 REPORT #: F:\CUS\G\GMT\GMT72H8.RPT PAGE #: 2 APPLICANT: GMT INDUSTRIAL LTD. FCC ID: BSYWT-113 NAME OF TEST: RADIATION INTERFERENCE RULES PART NO.: 15.235 REQUIREMENTS: CARRIER FREQUENCY WILL NOT EXCEED 80 dBuV/m AT 3M. OUT-OF-BAND EMISSIONS SHALL NOT EXCEED: 30 - 88 MHz 40.0 dBuV/M MEASURED AT 3 METERS 88 - 216 MHz 43.5 dBuV/M 216 - 960 MHz 46.0 dBuV/M ABOVE 960 MHz 54.0 dBuV/M * Harmonics must be less than the fundamental. TEST DATA: EMISSION METER READING COAX ANTENNA FIELD FREQUENCY AT 3 METERS LOSS CORRECTION STRENGTH MARGIN ANT. MHz dBuV dB FACTOR dB dBuV/m@3m dB POL. 49.86 56.80 0.25 10.99 68.04 1…

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