AAO210184814-Channel Family Radio Service

1 Two-Way Personal Radio • 14 Channels • 200mW Output Power • No License Required! • Unique LCD Display • Dual-color LCD Backlight • Automatic Squelch • Call Button • Insects sound tones 2 Features Family Radio Service (FRS) is a license-free, two-way, short-range voice radio service that lets families and groups keep in touch with each other on specific reserved channels. This walkie talkie is recommended for children ages 6 to 13. Your RadioShack 14 Channel Personal FRS 2-Way Radio is a lightweight, palm- sized radio you can use to talk with another person who has a FRS radio set to the same frequency as your radio. Your radio has auto-squelch, so you will not hear anything on a channel unless someone is transmitting nearby on the same channel. Your radio has last channel memory retention. It automatically resumes on the last channel you monitored when you turn on the radio. Your radio’s display has a backlight that turns on for about 10 seconds when you press the Up or Down key. Your radio’s other features include: 14 Channels – provide clear communications for up to two miles. Key Beep – generate insect sound when you acknowledge call with key press. Channel Lock – allows the active channel to be locked for next use. 3 Installing Batteries Your radio requires 3 AAA alkaline batteries for power. For the best performance and longest life, we recommend RadioShack batteries. Cautions: ß Use only fresh batteries of the required size and recommended type. ß Do not mix old and new batteries, different types of batteries (alkaline or rechargeable). 1. Rotate VOL/OFF counterclockwise until it clicks to turn off the radio. 2. Use a Philips screwdriver to loosen the screws in the battery door, then lift the door off. 3. Install 3 AAA batteries according to the polarity symbols (+ and -) marked inside. 4. Replace the cover and then rotate VOL/OFF clockwise until it clicks to turn on the radio. 5. The battery indicator [] on the bottom of the LCD display shows how much power remain. The battery indicator displayed the battery power in 4 levels: []Battery full [ ]Below 70% battery capacity [ ]Below 30% battery capacity [](Blinking) Battery depleted Warning: Dispose of old batteries promptly and properly. Do not burn or bury them. Caution: If you do not plan to use the radio for a month or longer, remove the batteries. Batteries can leak chemicals that can destroy electronic parts. 4 To Communicate 1. Rotate VOL/OFF to turn the radio on and off and adjust the volume. When the radio is on, Battery Level indicator will show the state of the batteries. Note: If you do not press any button on the radio or the radio receives no signal after 10 seconds, a built-in energy saving system switches on automatically to reduce power consumption and lengthen standby time. 2. Slide switch up, the Bug’s wing will be opened automatically. 3. Hold down PTT (Push-To-Talk) and speak into the microphone to transmit. Transmit icon [] appears. When you finish your transmission, release PTT. Note: If you hold down PTT continuously for about 2 minutes, the radio will assume the button is being pressed accidentally and the radio automatically stops transmission to save power. Selecting Channel To manually select a channel, press Up or Down key. The selected channel number appears as shown. Note: The channel number will scroll rapidly if you press and hold Up or Down key. 5 FRS Frequencies Channel No.Frequency (MHz) Channel No.Frequency (MHz) 1462.56258467.5625 2462.58759467.5875 3462.612510467.6125 4462.637511467.6375 5462.662512467.6625 6462.687513467.6875 7462.712514467.7125 Call Tone Hold down CALL to send a page to other FRS radios set to the same channel. Transmit icon [] appears and the call tone sounds. After you hold down CALL for about 6 seconds, the tone stops. During call tone generation, the backlight will change from green to Amber and then to Red. Finally, the Red color backlight will flash if the user is still holding the CALL key after Call tone generation was terminated. Channel Lock You can lock the Up or Down key to prevent accidental changes of the channel number. The lock switch is located in the battery cabinet. If you press Up or Down key during channel lock, the word LOCK [] will be scrolled in the LCD display until the UP/DOWN key is released or the PTT/CALL key is pressed. Use of Carabiner You can attach the carabiner provided to the “feeler” of your radio lug. Then you can hook your radio to your bag. Care Keep the radio dry; if it gets wet, wipe it dry immediately. Use and store the radio only in normal temperature environments. Handle the radio carefully; do not drop it. Keep the radio away from dust and dirt, and wipe it with a damp cloth occasionally to keep it looking new. 6 Modifying or tampering with the radio’s internal components can cause a malfunction and might invalidate its warranty and void your FCC authorization to operate it. If your radio is not performing as it should, take it to your local RadioShack store for assistance. FCC Information Important: Do not open your radio to make any internal adjustments. Your radio is set up to transmit a regulated signal on one of 14 assigned frequencies. It is illegal to alter or adjust the settings inside the radio to exceed those limitations. Any adjustments to your radio must be made by a qualified technician using the proper test equipment. To be safe: ß Never open your radio’s case. ß Never change or replace anything in your radio except the batteries. Your radio might cause TV or radio interference even when it is operating properly. To determine whether your radio is causing the interference, turn it off. If the interference goes away, your radio is causing it. Try to eliminate the interference by: ß Moving your radio away from the receiver. ß Calling your local RadioShack store for help. If you cannot eliminate the interference, the FCC requires that you stop using the radio. This device complies with Part15 of the FCC Rules. Operation…

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S3F8235 Power Control Unit I/O /TX_ON /VCO_ON LCD Common Drive LCD Segment Drive I/O /PULSE CALL_TONE AMP AUDIO_ON AUDIO_IN PA BAT_4.5V VCO PLL S1T8825 TX_MOD PLL_STB EEPROM 24C02 IF DEMOD DBL 5018 AUDIO_IN MUTE /RX_ON KEY SWITCH CALL TONE UP DOWN PTT I/O A/D BATTERY_DET XOUT XIN 4MHz RESONATOR VOLUME CONTROL 21-1848 14 Channel MID Range FRS SPEAKER MIC RF Front End PLL_DATA/EE_DATA/MIC_ON PLL_CLK/EE_CLK PLL_DATA/EE_DATA PLL_CLK/EE_CLK PA DRVIER LPF TX_LO 2V7 10.25MHz TCXO TX_2V7 LNA 464MHz SAW FILTER VCO_2V7 10.25MHz 10.7MHz CRYSTAL FILTER RX LO LPF Limiter PRE- EMPHASIS & AMP I/O VT RX_2V7 RX_2V7 450KHz FIL RX_2V7 450KHz Discriminator FIL_CALL_TONE RX_ON MIC_ON GREEN_LED_ONRED_LED_ON De-Emp Dual c olor LED RED_LED_ON GREEN_LED_ON LOCK MIC_MUTE MIC_MUTE FIL_CALL_TONE TX : 462.5625 - 467.7125MHz RX: 451.8625 - 457.0125MHz TX/RX : 462.5625 - 467.7125MHz

Test SetupFCCID : AAO2101848 External Photo -front External Photo - rear

Test SetupFCCID : AAO2101848 Internal Photo - 1 Internal Photo - 2 Test SetupFCCID : AAO2101848 Internal Photo – 3 Internal Photo – 4 Test SetupFCCID : AAO2101848 Internal Photo – 5

1 of 2 TRANSCEIVER CIRCUIT DESCRIPTION 21-1848 is a single board design which consists both RF and Baseband part. RF PART The RF part contains all necessary RF circuit. It converts the RF signal picked up by the antenna to demodulated analogue signal for further processing. Besides, the base band analogue voice signal, will use to FM-modulate the RF carrier during transmission. The main building blocks of the RF part includes a LNA, a SAW filter, a Mixer, a VCO, a Ceramic filter, FM-IF detector circuit and power amplifier for transmission. Among those building blocks, the RF circuit can be divided into two sections. A: RX section This product employs traditional double conversion superheterodyne architecture with the following functional blocks: 1. The LNA with cascade configuration is composed by transistor Q1 and Q2. It has the merits of low noise figure and high insertion gain. 2. The LO signal is generated by VCO which is phase locked with the reference TCXO circuit (X801) at the 10.25MHz. The TCXO can stabilize the frequency of the oscillator within 2.5ppm from –20 to +50 degree C. The LO signal is amplified by transistor Q4 and coupled to the mixer (Q3) for RF to IF conversion. The LO frequency is controlled by the PLL (U2) after received command from MCU (U101). 3. The first image rejection filter, F1, is a SAW (surface acoustic wave) device, with the merits of having low insertion loss and high stop band attenuation. 4. The mixer is a common emitter configured transistor Q3. It converts RF signal to an IF of 10.7MHz. This IF will further be filtered by the crystal filter F2. 5. Inside the FM-IF chip, the IF signal is further down converted to 450KHz second IF demodulation. The second LO signal is generated by the reference oscillator of the PLL chip. The second IF signal is also further filtered by the ceramic filter for better adjacent channel rejection response. The second IF signal is then demodulated by the resonator X1. The demodulated audio signal will be transferred to the main board for further processing. 6. By trimming the VR1, the audio noise signal level to the internal comparator of the FM IF chip 3361 can be varied. Since the comparator output was used to determine the status of received signal quality, and hence the squelch level can be adjusted. B: TX section 1. The TX carrier is also generated by the VCO with the control from PLL chip. The VCO signal is coupled to amplifier Q501 and Q502. The output signal will be boosted up by the Class-B power amplifier Q503, Q504 and Q505. BASE BAND PART 2 of 2 The digital part controlled all the base band signal including voltage regulation, battery charging, keyboard input, call tone generator and display. 1. Voltage regulation: The operating voltage of the circuit is stabilized by the 2.7V voltage regulator U107. 2. Power management: In order to extend the battery life of the unit, unnecessary circuit during different operation modes will be shut down for power saving. The on and off mechanism is controlled by the MCU with the help of some analogue switches which are realized by transistors: They can be classified as : a. Q101VCO circuit b. Q102RX RF circuit c. Q103TX RF circuit d. Q112MIC circuit 3. Display: The channel number, TX icon, battery icon will be prompted to the users by LCD. There is also a tri-color backlite LED for better visual effect under dim environment. 4. Keyboard input: The transceiver had several function keys such as UP, DOWN, PTT and Call tone switch. During the operation, all these function key input will be handled by the MCU. 5. Memory: The memory or setting of the transceiver is stored in the EEPROM U102. 6. Low battery dectection: It is realized by the internal A/D of the MCU during power saving mode. 7. Low pass filter, Pre-emphasis, Limiter: The acoustic input transducer by the microphone will go through the Low pass filter first which is realized by U106. 8. De-emphasis, and volume control: The demodulated base band signal from RX section needs to be de-emphasised first. Then the signal will pass through the High pass filter for clear audio signal recovery. This section is realized by R28 and C30. This signal will feed to the audio amplifier U104 for power boosting. The volume level is controlled by the rotary resistor SW107. 9. MCU internal clock and reset: The reset is realized by D101. A 4 MHz ceramic resonator is used as the main resonating element in order to have a better accuracy. 10. Automatic Squelch: The squelch detection signal from RX section will alert the MCU to mute the speaker. The squelch level is controlled by VR1 on the RF part.

21_1848_Alignment_Procedure_A_0503Last Updated: 05-03-2002 Tandy Electronics ( China ) Limited Alignment Procedures Subject:FRS Cat. / Model No.:21-1848 RevisionA Total Page1 Designed ByBunny NG Approved By Standard Alignment Conditions Power Supply: 4.5 V DC Antenna Impedance: 50 ohm RF Signal Modulation:FM, 1 kHz sine wave with 1.5 kHz deviation Tuning Channel:Channel 4 (462.6375MHz) Audio Loading:32 ohm Audio Output Power:200 mW 1.TCXO Frequency Tuning The reference frequency 10.25MHz of the PLL is generated by the TCXO circuit (X801 and Q801). Since the TCXO frequency may be off tuned. We can measure output through pin 11 of U2 by using spectrum analyzer to check the accuracy. 1.1 Tuning component: VC801 1.2 Equipment: Spectrum analyzer with high stability time base 1.3 Personnel : Skilful 1.4 Measure the 10.25MHz TCXO output signal to make sure it is accuracy: 1.4.1 Set channel 4 1.4.2 Press PTT 1.4.3 Monitor the frequency of the TCXO output signal through the pin 11 of U2. 1.4.4 Tune the VC801 until the TCXO output carrier is at 10.25MHz ± 0.0005 MHz 2. VCO Tuning The tunable range of the VCO should be adjusted to make sure the control voltage of the VCO is enough margin for PLL locking 2.1 Tuning component: L201 2.2 Equipment: DVM for voltage measurement 2.3 Personnel : Skilful 2.4 Measure the control voltage of VCO to make sure there is enough margin for PLL margin: 2.4.1 Set to channel 1 2.4.2 Press PTT key 2.4.3 Measure the voltage at TP3 and it should be higher than 1V 2.4.4 Set to channel 14 2.4.5 Press PTT key 2.4.6 Measure the voltage at TP3 and it should be lower than 2.2V 3.Modulation Limit Tuning Set the transceiver to operate in Channel 4, and connect the antenna output of the transceiver to the RF tester and monitor the modulation level. Input audio signal ( 1 kHz sine wave, 100 mV ) through the MIC input port (RA_SHORT) to the transceiver. RF signal is transmitted. Adjust VR101 until the frequency deviation is around but less than 2 kHz 3.1 Tuning component : VR101 21_1848_Alignment_Procedure_A_0503Last Updated: 05-03-2002 3.2 Equipment: Through MIC input port (RA_SHORT), connect the audio generator and transceiver together. Communication test set and modulation analsyer. 3.3 Personnel : Skilful 4.Squelch Tuning The squelch function of 21-1848 is realized by rectifying the demodulated noise signal. If the rectified noise level is higher than the threshold. A logic level will be generated to the MCU to determine the on and off of speaker. Hence by adjusting the level input to the rectifier, the squelch level can be controlled. 4.1 Tuning component: VR1 4.2 Equipment: Test jig with pin connected to speaker terminal Signal generator at –124dBm with 1KHz modulation source of 1.5KHz FM modulation 4.3 Personnel: Skiful 4.4 Testing procedure : 4.4.1 Input RF signal = 462.6375 MHz, frequency deviation = 1.5 kHz, modulating signal = 1 kHz. 4.4.2 Connect the transceiver to the RF generator and monitor the audio output from the speaker terminal. 4.4.3 Reduce the generator output power in ½ dB step until the SINAD meter shows 9-11 dB. 4.4.4 Rotate VR1 until the audio signal is JUST resumed from mute. 4.4.5 Reduce the RF generator output power until the audio signal is muted. Increase the output power in ½ dB step until the audio is just resumed. The SINAD meter should read 8-12 dB. 5.RF power Tuning In order to meet FCC requirement, the ERP output power should be tuned to 200mW. 5.1 Tuning component: R503 5.2 Equipment: Communication test set with RF power measurement option 5.3 Personnel: Skiful 5.4 Testing procedure: 5.4.1 Connect the DUT to the communication test set. 5.4.2 Set to channel 4. 5.4.3 Press PTT key to activate the TX ON. 5.4.4 Set the R503 to lower or higher value to increase or decrease the RF power respectively.

T576_RevC.1.sch-1 - Wed May 22 09:44:44 2002 T576_RevC.1.sch-2 - Wed May 22 09:45:45 2002

• The test results reported in this report shall refer only to the sample actually tested and shall not refer or be deemed a refer to bulk from which such a sample may be said to have been obtained. • This report shall not be reproduced except in full without prior authorization from Intertek Testing Services Hong Kong Limited • For Terms And Conditions of the services, it can be provided upon request. Intertek Testing Services Hong Kong Ltd. 2/F., Garment Centre, 576 Castle Peak Road, Kowloon, Hong Kong. Tel: (852) 2173 8888 Fax: (852) 2785 5487 RadioShack Corporation Application For Certification (FCC ID: AAO2101848) June 11, 2002 WO# 0206160 WL/Sandy June 11, 2002 INTERTEK TESTING SERVICES FCC ID: AAO2101848 i SUMMARY OF CONTENTS LIST OF EXHIBITS EXHIBIT 1:General Description EXHIBIT 2:System Test Configuration EXHIBIT 3:RF Power Output EXHIBIT 4:Modulation Characteristics EXHIBIT 5:Occupied Bandwidth EXHIBIT 6:Spurious Emission EXHIBIT 7:Frequency Stability EXHIBIT 8:Technical Specifications EXHIBIT 9:Product Labelling EXHIBIT 10:Photographs EXHIBIT 11:Instruction Manual EXHIBIT 12:Tune Up Procedure EXHIBIT 13:Part List EXHIBIT 14:Input Current EXHIBIT 15:RF Exposure Info INTERTEK TESTING SERVICES FCC ID: AAO2101848 ii MEASUREMENT/TECHNICAL REPORT Application:RadioShack Corporation Trade Name/Model No:RadioShack 21-1848 Date:June 11, 2002 This report concerns (check one:)Original Grant X Class II Change Equipment Type: Family Radio Service, FRS Deferred grant requested per 47 CFR 0.457(d)(1)(ii)? Yes No X If yes, defer until: date Company Name agrees to notify the Commission by: date of the intended date of announcement of the product so that the grant can be issued on that date. Report prepared by:Wilson Loke Intertek Testing Services 2/F., Garment Centre, 576 Castle Peak Road, Kowloon, Hong Kong. Phone:852-2173-8575 Fax:852-2371-0521 INTERTEK TESTING SERVICES FCC ID: AAO2101848 iii Table of Contents 1.0 General Description............................................................................................................2 1.1 Product Description.........................................................................................................2 1.2 Related Submittal(s) Grants..............................................................................................3 1.3 Test Methodology...........................................................................................................3 1.4 Test Facility.....................................................................................................................3 2.0 System Test Configuration.................................................................................................5 2.1 Justification......................................................................................................................5 2.2 EUT Exercising Software.................................................................................................6 2.3 Special Accessories.........................................................................................................6 2.4 Measurement Uncertainty.................................................................................................6 2.5 Equipment Modification....................................................................................................6 3.0 RF Output Power (Section 95.639(d))................................................................................8 4.0 Modulation Characteristics (Section 95.637(a))..............................................................12 4.1 Modulation Frequiency Response...................................................................................13 4.2 Modulation Limiting Characteristic..................................................................................15 4.3 Audio Low Pass Filter Response....................................................................................17 5.0 Occupied Bandwidth (Section 95.633(c)) .........................................................................19 6.0 Spurious Emission (Section 95.635(b)).............................................................................21 6.1 Field Strength of Spurious Radiation...............................................................................22 7.0 Frequency Stability (Section 95.627)................................................................................28 7.1 Frequency Tolerance......................................................................................................29 7.2 Temperature Extreme Condition.....................................................................................31 7.3 Voltage Extreme Condition.............................................................................................34 8.0 Technical Specifications....................................................................................................37 9.0 Product Labelling..............................................................................................................41 10.0 Equipment Photographs..................................................................................................44 11.0 Instruction Mannal..........................................................................................................46 12.0 Tune Up Procedure.........................................................................................................48 13.0 Part List...........................................................................................................................50 14.0 Input Current...................................................................................................................52 INTERTEK TESTING SERVICES FCC ID: AAO2101848 iii 15.0 RF Exposure Info............................................................................................................54 INTERTEK TESTING SERVICES FCC ID: AAO2101848 iv List of attac…

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Audio Low Pass Filter Response -60.0 -50.0 -40.0 -30.0 -20.0 -10.0 0.0 10.0 110100 Frequency (kHz) dB relative to 1 kHz LPF Response TIA/EIA-603

Modulation Frequency Response 0.00 0.50 1.00 1.50 2.00 2.50 20070012001700220027003200370042004700 Modulation Frequency (Hz) Frequency Deviation (kHz) Modulation Frequency Response 0.00 0.50 1.00 1.50 2.00 20070012001700220027003200370042004700 Modulation Frequency (Hz) Modulation Index (%)

Modulation Limiting Characteristic 0.00 0.50 1.00 1.50 2.00 2.50 475767778797107117127137 Modulation Input (dBSPL) Frequency Deviation (kHz) 500Hz 1000Hz 2500Hz 3125Hz

Test SetupFCCID : AAO2101848 Radiated -front Radiated - rear