PDHGMRS-1535Handheld GMRS Transceiver

01-02-07 - I - General Mobile Radio Service GMRS-1535 l CTCSS Sub Tone (38 Frequency) l VOX Operating l Scanning l Monitor l Weather Radio Band (10 Channels) l Weather Alert l Key Pad Lock l Back Light LCD Display l Battery Status Indicator l Emergency Channel l Compact Size l Time out timer l Choice of Battery - Rechargeable Battery - Standard Alkaline Instruction Manual 01-02-07 - II - CONTENTS 1 INTRODUCTION.........................................................................................................................1 1) Product Description..............................................................................................................1 2) Package Contents.................................................................................................................1 3) Features................................................................................................................................1 4) Front side Overview.............................................................................................................2 5) Rear side Overview................................................................................................................3 6) Function and Feature Display...............................................................................................4 7) GMRS Mode (Function) key sequence...................................................................................5 8) Weather Mode (Function) key sequence...............................................................................5 2 INSTALLATION...........................................................................................................................5 1) Installation of the batteries..................................................................................................5 2) Antenna................................................................................................................................6 3 Basic Operation.......................................................................................................................6 1) On/Off & Volume control......................................................................................................6 2) Selecting the Channel and tone code(CTCSS)......................................................................6 3) Receiving...............................................................................................................................6 4) Monitoring the channel.........................................................................................................7 5) Auto Channel and tone code(CTCSS) Scanning....................................................................7 6) Transmitting.........................................................................................................................7 7) Dual Watch Scan Channel and tone code(CTCSS)................................................................8 8) VOX (Voice Operated Switching)...........................................................................................8 9) Emergency Call Ringer Selection Mode................................................................................9 10) Emergency Channel Mode ........................................................................................9 11) Keypad Lock.......................................................................................................................9 12) Backlight.............................................................................................................................9 13) Battery status indicator....................................................................................................10 14) Beep tone ..................................................................................................................10 15) Time out timer..................................................................................................................10 16) Transmitting Power Selection Mode.................................................................................10 17) Roger Beep tone...............................................................................................................11 18) Weather Mode...................................................................................................................11 19) Weather Alert....................................................................................................................11 20) External DC socket...........................................................................................................11 01-02-07 - III - 21) External Speaker - Mic......................................................................................................11 4 INFORMATION.......................................................................................................................12 1) Radio..................................................................................................................................12 2) Battery................................................................................................................................12 3) Operating temperature.......................................................................................................12 5 SPECIFICATIONS...................................................................................................................12 1) GENERAL SPECIFICATIONS................................................................................................12 2) TRANSMITTER....................................................................................................................13 3) RECEIVER...........................................................................................................................13 4) DIMENSIONS.....................................................…

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MODEL NO. GMRS-1535 FCC ID: PDHGMRS-1535 SERIAL NO. 012100001 THIS DEVICE COMPLIES WITH PART 15 OF THE FCC RULES. OPERATION IS SUBJECT TO THE CONDITION THAT THIS DEVICE DOES NOT CAUSE HARMFUL INTERFERENCE. MADE IN KOREA

GMRS-1535 01-02-09 Page 8 7. THEORY OF OPERATIONS 7-1. Circuit Composition and Operation Theory The basic explanation for the circuit composition GMRS-1535 consists mainly of the one board controlling the analog circuit parts and the digital circuit parts for the other control. 7-2. Receiver GMRS-1535 transmission parts is composed in the double conversion system, which has the 1 st IF frequency of double 21.7 MHz and the 2 nd IF frequency of 450 kHz. With the RF fronted which has an excellent band characteristics and skirt characteristics, the 2 pole MCF used in the 1 st IF, and the 3 pole ceramic filter in the 2 nd IF, the reception interrupting factors such as the image and the sensitivity repression are reduced for the more stable reception. 7-2-1. RF Front-end The signal received by the antenna will be transmitted to the band pass filter through the antenna switching circuit consisted of L28, L29, L30, L32, C133, 135, C137, C138. The front RF amplifier transistor Q1 consists of the L2, L3, C2, C3, C5, CC6, C7, C8 input band pass filter and SAW1 output band pass filter, primarily diminishes the other signal rather than the 1 st IF image and other signal within the reception band and amplifier only the necessary signal within the RF. 7-2-2. 1 st Mixer The receiver which has been amplifier in the RF front-end is provided to the base of the 1 st mixer Q2. The 1 st L/O signal provide from the VCO is supplied to the emitter of Q2 and Converted to the 1 st IF 21.7 MHz 7-2-3. 1 st IF Filter and 1 st IF Amplifier The signal covered by Q2 to 21.7 MHz, the 1 st frequency, change its impedance through C17, L7 and then is infused to the fundamental MCF which has the center frequency of 21.7 MHz and the width of +/- 3.75 KHz. Here, the signal reduces the image and other unwanted signal for the 2 nd IF , and changes its impedance again through the R11. Then the signal is infused to the Q5, the 1 st IF amplifier. The signal infused to the Q5 is amplifier approximately by 20 dB in other to acquire the required reception sensitivity, and infused to the IC1 which functions as the 2 nd mixer, the 2 nd IF amplifier, and the FM detector. 7-2-4. 2 nd Mixer, and IF, FM Detector (IC1) The receiver IF signal of 21.7 MHz, which has been infused to IC1 is mixed with the 2 nd L/O converted to 450 KHz, the 2 nd IF frequency. The receiver signal converted to the 2 nd IF signal frequency passed through the CF1, the ceramic filter of 450 kHz again. After the limiting inside the IC1 and the FM demodulating by the quadrature detector inside the IC1, the signal offers the output through the 9 th pin of IC1. The squelch circuit is composed to detect the noises from the received signal demodulate in the 9 th pin of the IC1. For this purpose, the noise filter is using the OP amplifier inside the IC1. GMRS-1535 01-02-09 Page 9 7-2-5. Audio Power Amplifier (IC2) The receiver audio signal, which has been adjusted to the appropriate electrical volume by controlled CPU and Tone IC are supplied to the 2 nd pin of the IC2 and amplified approximately by 20 dB. Then, it turns up the speaker with the maximum output of 0.5 watts. The 6 th pin of IC2 is the audio mute terminal. If a voltage supply to the 6 th pin of the IC2 is not supplied to this terminal, the IC2 stops functioning as the audio power amplifier regardless of the signal supplied to the 2 nd pin of the IC2, and there is no sound emitter from the speaker. 7-3. Transmitter The transmitter parts of the GMRS-1535 is designed to amplify the RF signal oscillated and modulated by the synthesizer to approximately 2W by the power transistor of Q23. 7-3-1. Pre-emphasis (IC8) The voice signal input from the microphone is pre-emphasized at the IC8A. The signal which comes out of the IC8B is limited to a certain amplitude for the voice signal not to exceed the allowable band width assigned for transmission. 7-3-2. Tx Power (Q24) The transmitted signal of approximately 7 mW, combined at the driver TR is supplied to the base of the Q23 amplifier. The transmitted signal amplifier to 2W here passes the TX LPF of the 2 nd characteristics of the L27 and L32, and RX/TX switching takes place by the D10. After this, The signal is provided to the antenna the TX LPF of the 1 st characteristics consisted of the L28, L29, L30, C132, C133, C135, C137, C138. 7-4. “GMRS” Frequency Synthesizer 7-4-1. Voltage Control Oscillator (VCO) The VCO of oscillates 462.5625 MHz to 462.7250 MHz under the transmission condition and 441.3125 MHz to 441.475 MHz under the reception condition. The VCO consist of the clip oscillator of the Q16 and contains the oscillator frequency of approximately 21.7 MHz during the transmission/reception conversion. That is since the VCO should oscillate relatively low frequency during reception compared to transmission, the D5 is biased by the Q12. Therefore as a result, the C90 is added in parallel to the resonance circuit of the VCO to oscillate a low frequency. During transmission, a relatively high frequency should be oscillate compared to reception. Therefore, the D5 is adversely biased by the Q12, and as a result , The C90 which is added unparalleled to the circuit of the VCO is removed to oscillate the desired transmission frequency. The VCO is controlled by the IC3 PLL IC in order to oscillate accurate frequency. The output frequency of the VCO is supplied to the IC3 PLL IC immediately. At the IC3, TCXO (21.25MHz) is compared to the output frequency of the VCO. The VCO is controlled the loop filter consisted of the R42, R43, R45, L12 and the C72, C73, C660 in order to oscillate the stable frequency wanted for the radio. The VCO controlled voltage which as passed the loop filter is supplies to the D6 varactor diode, and the VCO an oscillate the PLL programmed frequency by the capacity variance in the D7. In addition, the L15 on the VCO circuit function as frequency for the VCO to be properly controlled by the IC3 PLL IC. GMRS-1535 01-02-09 Page 10 7-4-2. RX/TX Buffer Ampl…

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GMRS-1535 01-02-09 Page 11 8. ALIGNMENT INSTRUCTIONS WARNING Any repairs or adjustment should be made under the supervision of a qualified radio-telephone technician. 8-1. TRANSMITTER 8-1-1. Power Supply Voltage The power supply voltage should be set for 6.0 V DC measured at the radio during transmit. Periodically check the supply voltage during the alignment procedure. 8-1-2. Frequency Setting A. Connect a frequency counter or Communications Service Monitor to the antenna connector through an RF power attenuates (10 watt minimum rating, 20 dB minimum attenuation). B. Depress the PTT switch. C. Adjust the TCXO such that output frequency is equal to the channel. Frequency with a maximum error of ± 300 Hz. D. Adjust L15 for ± 300 Hz. E. Release the PTT switch. 8-1-3. Output Power Alignment A. Set the power supply voltage for 6.0 V DC. B. Connect a communications Service Monitor or a wattmeter and dummy load to the antenna connector. C. Depress the PTT switch. D. To be convinced for 2.0 watt output power with a maximum error of ± 0.2 watt. E. Release the PTT switch. 8-1-4. Deviation Adjustment A. Connect an audio generator to the microphone jack JIG. The audio frequency should be set at 1KHz B. Connect an FM deviation meter or communication Service Monitor to the antenna connector Through an RF power attenuates (10 watt minimum rating, 20 dB minimum attenuates ). Set the monitor to read peak deviation. C. Depress the PTT switch. D. Adjust the audio generator level 100 mV rms. E. Adjust RV2 for 2.3 KHz maximum deviation. F. Release the PTT switch. 8-2. RECEIVER Note : Insure that the proper channel has been selected before proceedings with the alignment procedure. 8-1. Power Supply Voltage. The proper voltage for testing is 6.0 V DC. 8-2. Receiver Alignment A. Connect an RF signal generator or Communications Service Monitor to the antenna connect. B. Connect a SINAD meter and oscilloscope across the speaker terminals. C. Set the output level of the RF signal generator for –47 dBm the generator should be set for 1.5 KHz deviation of a 1 KHz tone. D. Set the audio output level for 0.6 Vrms by adjusting volume. E. Adjust L4 for maximum audio output. F. Reduce the output level of the RF signal generator for produce a 12 dB SINAD indication.

   

TABLE OF CONTENTS LIST APPLICANT: TRIDENT TECHNOLOGY INTERNATIONAL FCC ID: PDHGMRS-1535 TEST REPORT: PAGE 1......COVER SHEET - GENERAL INFORMATION & TECHNICAL DESCR. PAGE 2......TECHNICAL DESCRIPTION CONTINUED & RF POWER OUTPUT PAGE 3......MODULATION CHARACTERISTICS & OCCUPIED BANDWIDTH PAGE 4......SPURIOUS EMISSIONS AT ANTENNA TERMINALS PAGE 5......UNWANTED RADIATION PAGE 6......METHOD OF MEASURING SPURIOUS EMISSIONS PAGE 7......FREQUENCY STABILITY PAGE 8......LIST OF TEST EQUIPMENT EXHIBITS CONTAINING: EXHIBIT 1.........FCC ID LABEL SAMPLE & SKETCH OF LOCATION EXHIBIT 2A........EXTERNAL FRONT VIEW PHOTOGRAPH EXHIBIT 2B........EXTERNAL BACK VIEW PHOTOGRAPH EXHIBIT 3A........INTERNAL COMPONENT VIEW PHOTOGRAPH EXHIBIT 3B........INTERNAL COPPER VIEW PHOTOGRAPH EXHIBIT 4.........BLOCK DIAGRAM EXHIBIT 5.........SCHEMATICS EXHIBIT 6.........USER'S MANUAL EXHIBIT 7.........THEORY OF OPERATION EXHIBIT 8.........TUNING PROCEDURE EXHIBIT 9.........AUDIO LOW PASS FILTER EXHIBIT 10A.......MODULATION LIMITING 300 Hz EXHIBIT 10B.......MODULATION LIMITING 1000 Hz EXHIBIT 10C.......MODULATION LIMITING 3000 Hz EXHIBIT 11........AUDIO FREQUENCY RESPONSE GRAPH EXHIBIT 12........OCCUPIED BANDWIDTH CW PLOT EXHIBIT 13........OCCUPIED BANDWIDTH EXHIBIT 14........TEST SET UP PHOTO APPLICANT: TRIDENT TECHNOLOGY INTERNATIONAL FCC ID: PDHGMRS-1535 DATE: FEBRUARY 5, 2001 REPORT #: T:\CUS\T\TRIDENT\11AU1\11AU1RPT.DOC PAGE: TABLE OF CONTENTS GENERAL INFORMATION REQUIRED FOR CERTIFICATION 2.1033(c)(1)(2) TRIDENT TECHNOLOGY INTERNATIONAL will manufacture the FCCID: PDHGMRS-1535 GMRS CHANNELS TRANSCEIVER in quantity, for use under FCC RULES PART 95. TRIDENT TECHNOLOGY INTERNATIONAL 100 THROCKMORTON STREET SUITE 1300 FT. WORTH, TX 76102-2802 2.1033 (c) TECHNICAL DESCRIPTION 2.1033(c)(3) Instruction book. A draft copy of the instruction manual is included as EXHIBIT 6. 2.1033(c) (4) Type of Emission: 9K5F3E 95.629 Bn = 2M + 2DK M = 3000 D = 1.75K Bn = 2(3.0)+2(1.75) = 9.5K Authorized Bandwidth 20.0KHz 2.1033(c)(5) Frequency Range: 462.5625 - 462.7250 MHz 95.627 2.10311c)(6)(7) The Maximum Output Power Rating: High: 2.0 Watts Low: .6 Watt effective radiated power. 2.1033(c)(8) DC Voltages and Current into Final Amplifier: FINAL AMPLIFIER ONLY FOR LOW POWER SETTING INPUT POWER: (6.0V)(.210A) = 1.26 Watts FOR HIGH POWER SETTING INPUT POWER: (6.0V)(.600A) =3.60 Watts 2.1033(c)(9) Tune-up procedure. The tune-up procedure is included 8. APPLICANT: TRIDENT TECHNOLOGY INTERNATIONAL FCC ID: PDHGMRS-1535 DATE: FEBRUARY 5, 2001 REPORT #: T:\CUS\T\TRIDENT\11AU1\11AU1RPT.DOC PAGE #: 1 2.1033(c)(10) Complete Circuit Diagrams: The circuit diagram is included as EXHIBIT 5 of this report. The block diagrams are included as EXHIBIT 4 of this report. 2.1033(c)(11) A photograph or a drawing of the equipment identification label is included as exhibit No. 1. 2.1033(c)(12) Photographs(8"X10") of the equipment of sufficient clarity to reveal equipment construction and layout, including meters, labels for controls, including any view under shields. See exhibits 2-3. 2.1033(c)(13) Digital modulation is not allowed. 2.1033(c)(14) The data required by 2.1046 through 2.1057 is submitted below. 95.639 Power Output shall not exceed 50.0 Watts effective radiated power. There can be no provisions for 95.649 increasing the power or varying the power.RF power output. 2.1046(a) RF power is measured by connecting a 50 ohm, resistive watt meter to the RF output connector. With a nominal battery voltage of 8.4 V, and the transmitter properly adjusted the RF output measures: OUTPUT POWER: HIGH: 2.0 Watts LOW: 0.60 Watt 2.1046(a) RF power output. The test procedure used was TIA/EIA-603 S2.2.1. APPLICANT: TRIDENT TECHNOLOGY INTERNATIONAL FCC ID: PDHGMRS-1535 DATE: FEBRUARY 5, 2001 REPORT #: T:\CUS\T\TRIDENT\11AU1\11AU1RPT.DOC PAGE #: 2 2.1047(a)(b) Modulation characteristics: AUDIO FREQUENCY RESPONSE The audio frequency response was measured in ac- cordance 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. See Exhibit 11. 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 on the following pages. Curves are provided for audio input frequen- cies of 300, 1000, and 3000 Hz. See Exhibits 10A-10C. 95.637 Post Limiter Filter Each GMRS transmitter, except a mobile station transmitter with a power of 2.5Watts or less, must be equipped with an audio low pass filter. At any frequency between 3 & 20KHz the filter must have an attenuation of 60log (f/3) greater than the attenuation at 1KHz. See Exhibit 9. 2.1049 Occupied bandwidth: 95.635(b)(1)(3)(7) At least 25dB on any frequency removed from the center of the authorized bandwidth by more than 50%up to and including 100% of the authorized bandwidth. At least 35 dB on any frequency removed from the center of the authorized BW by more than 100% up to and including 250% of the authorized BW. At least 43+log10(T) on any frequency removed from the center of the authorized bandwidth by more than 250%. REPORT #: T:\CUS\T\TRIDENT\11AU1\11AU1RPT.DOC PAGE #: 3 2.1051 Spurious emissions at antenna terminals(conducted): The following data shows the level of conducted spurious responses at the antenna terminal. The test procedure used was TIA/EIA 603 S2.2.13 with the exception that the emissions were recorded in dBc. The spectrum was scanned from 0.4 to at least the 10th harmonic of the fundamental. Method of Measuring Conducted Spurious Emissions 2.1051 Spurious emissions at the Antenna Terminals NAME OF TEST: SPURIOUS EMISSIONS AT ANTENNA TERMINALS REQUIREMENTS: Emissions must be 43 +10log(Po) dB below the mean power output of the transmitter. HIGH POWER 43 + 1…

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Modulation Limiting Trident Tech. INT'L GMRS-1535 0 500 1000 1500 2000 020406080100 rms mVolts Deviation 300 Hz TRIDENT TECHNOLOGY INTERNATIONAL FCC ID : PDHGMRS-1535 JOB # : 11AU1 EXHIBIT # : 10A

Modulation Limiting Trident Tech. INT'L GMRS-1535 0 500 1000 1500 2000 010203040 rms mVolts Deviatio n 1000 Hz TRIDENT TECHNOLOGY INTL. FCC ID : PDHGMRS-1535 JOB # : 11AU1 EXHIBIT # : 10B

Modulation Limiting Trident Tech. INT'L GMRS-1535 0 500 1000 1500 2000 05101520253035 rms mVolts Deviation 3000 Hz TRIDENT TECHNOLOGY INTL. FCC ID : PSHGMRS-1535 JOB # : 11AU1 EXHIBIT # : 10C

Trident Tech. INT'L. GMRS-1535 -5 0 5 10 15 20 25 30 35 40 45 50 100100010000 Freque ncy rms mVolts audio response TRIDENT TECHNOLOGY INTL. FCC ID : PDHGMRS-1535 JOB # : 11AU1 EXHIBIT # : 11