R74TC-620V2Two-Way Radio

SAFETYTRAINING INFORMATION Your HYT radio generates RF electromagnetic energy during transmit mode. This radio is designed for and classified as “Occupational Use Only”, meaning it must be used only during the course of employment by individuals aware of the hazards, and the ways to minimize such hazards. This radio is NOT intended for use by the “General Population” in an uncontrolled environment. This radio has been tested and complies with the FCC RF exposure limits for “Occupational Use Only”. In addition, your HYT radio complies with the following Standards and Guidelines with regard to RF energy and electromagnetic energy levels and evaluation of such levels for exposure to humans: „ FCC OET Bulletin 65 Edition 97-01 Supplement C, Evaluating Compliance with FCC Guidelines for Human Exposure to Radio Frequency Electromagnetic Fields. „ American National Standards Institute (C95.1-1992), IEEE Standard for Safety Levels with Respect to Human Exposure to Radio Frequency Electromagnetic Fields, 3 kHz to 300 GHz. „ American National Standards Institute (C95.3-1992), IEEE Recommended Practice for the Measurement of Potentially Hazardous Electromagnetic Fields– RF and Microwave. „ The following accessories are authorized for use with this product. Use of accessories other than those (listed in the instruction) specified may result in RF exposure levels exceeding the FCC requirements for wireless RF exposure. To ensure that your expose to RF electromagnetic energy is within the FCC allowable limits for occupational use, always adhere to the following guidelines: „ DO NOT operate the radio without a proper antenna attached, as this may damaged the radio and may also cause you to exceed FCC RF exposure limits. A proper antenna is the antenna supplied with this radio by the manufacturer or antenna specifically authorized by the manufacturer for use with this radio. „ DO NOT transmits for more than 50% of total radio use time (“50%duty cycle”). Transmitting more than 50% of the time can cause FCC RF exposure compliance requirements to be exceeded. The radio is transmitting when the “TX indicator” lights red. You can cause the radio to transmit by pressing the “PTT” switch. „ ALWAYS keep the antenna at least 2.5 cm (1 inch) away from the body when transmitting and only use the HYT belt-clip which is listed in instructions when attaching the radio to your belt, etc., to ensure FCC RF exposure compliance requirements are not exceeded. To provide the recipients of your transmission the best sound quality, hold the antenna at least 5 cm (2 inches) from your mouth, and slightly off to one side. The information listed above provides the user with the information needed to make him or her aware of RF exposure, and what to do to as-sure that this radio operates with the FCC RF exposure limits of this radio. Electromagnetic Interference/Compatibility During transmissions, your HYT radio generates RF energy that can possibly cause interference with other devices or systems. To avoid such interference, turn off the radio in areas where signs are posted to do so. DO NOT operate the transmitter in areas that are sensitive to electromagnetic radiation such as hospitals, aircraft, and blasting sites. Occupational/Controlled Use The radio transmitter is used in situations in which persons are exposed as consequence of their employment provided those persons are fully aware of the potential for exposure and can exercise control over their exposure. IMPORTANT READ ALL INSTRUCTIONS carefully and completely before using the transceiver SAVE THIS INSTRUCTION MANUAL- This instruction manual contains important operating instructions for the Two-Way Radio EXPLICIT DEFINITIONS WORD DEFINITION WARNING Personal injury, fire hazard or electric shock may occur. CAUTION Equipment damage may occur. NOTE If disregarded, inconvenience only. No risk of personal injury, fire or electric shock. OPERATING NOTES „ When transmitting with a portable radio, hold the radio in a vertical position with its microphone 5 to 10 cm (2 to 4 inches) away from your mouth. Keep the antenna at least 2.5 cm (1 inch) from your head and body. „ If you wear a portable two-way radio on your body, ensure that the antenna is at least 2.5 centimeters (1 inch) from your body when transmitting. PRECAUTIONS WARNING! NEVER hold the transceiver so that the antenna is very close to, or touching exposed parts of the body, especially the face or eyes, while transmitting. The transceiver will perform best if the microphone is 5 to 10 cm (2 to 4 inches) away from the lips and the transceiver is vertical. WARNING! NEVER operate the transceiver with a headset or other audio accessories at high volume levels. CAUTION! NEVER short the terminals of the battery pack. NEVER connect the transceiver to a power source other than the Battery listed below Such a connection will ruin the transceiver. DO NOT push the PTT when not actually desiring to transmit. AVOID using or placing the transceiver in direct sunlight or in areas with temperatures below –30°C (–22°F) or above +60°C (+140°F). DO NOT modify the transceiver for any reason. MAKE SURE the flexible antenna and battery pack are securely attached to the transceiver, and that the antenna and battery pack are dry before attachment. Exposing the inside of the transceiver to water will result in serious damage to the transceiver. BE CAREFUL! The series transceivers employ waterproof construction, which corresponds to IPX7 of the international standard IEC 60529 (2001), 1 m depth for 30 minutes. However, once the transceiver has been dropped, waterproofing cannot be guaranteed due to the fact that the transceiver may be cracked, or the waterproof seal damaged, etc. The use of non-HYT battery packs/chargers may impair transceiver performance and invalidate the warranty. FCC CAUTION: Changes or modifications to this device, not expressly approved by HYT, could void your authority to operate this transceiver under FCC regulation…

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Shenzhen HYT Science & Technology Co., Ltd. Federal Communications Commission 7435 Oakland Mills Road Columbia, MD 21046 Gentlemen: This letter is to comply with Sections 0.457 and 0.459 pertaining to confidential material. Shenzhen HYT Science & Technology Co., Ltd. would like the following documents regarding this submission for FCC ID: R74TC-620V2, IC: 5465A-TC620V2 to be kept confidential. 1. Circuit Diagram 2. Block Diagram 3. Operational Description 4. Parts List The above material contains trade secrets or technical data, which would customarily be guarded from competitors. We do not want these documents to be accessible to the general public. Sincerely yours Shenzhen HYT Science & Technology Co., Ltd. Xiong Lei / Sales Manager

F.C.C. Justification Letter for Extended Frequency Use Shenzhen HYT Science & Technology Co., Ltd. advises that the Type TC-620V(2) Portable Handheld Transceiver has the design capability to operate in the frequency band 136 to 174 MHz. Shenzhen HYT Science & Technology Co., Ltd. also acknowledges that it is a violation of FCC rules, for this equipment to operate on Unauthorised Frequencies inside the United States of America. The table below has been collated using information from “FCC Online Table of Frequency Allocations 47 CFR Part 2.106” and lists the Frequency Ranges and Rule Parts, which permit the operation of this equipment inside the United States of America. Please note that Licensed End Users do not have access to any external controls that will allow them to programme the equipment. Equipment programming is the responsibility of Shenzhen HYT Science & Technology Co., Ltd. approved Service Agents. Table of Frequency Range and Parts- (Refer 47 CFR Part.2.106) Freq.Range (MHz) Part 90 Part 22 Part 74 Part 95A 150.8-152.855 NF NF NF 152.855-154 NF NF 154-156.2475 NF NF 156.2475-157.0375 157.0375-157.1875 F 157.1875-157.450 NF 157.450-161.575 NF NF NF 161.575-161.625 NF 161.625-161.775 NF NF 161.775-162.0125 NF NF 162.0125-173.2 F NF 173.2-173.4 NF Note: NF: Non Federal Agency F: Federal Agency Shenzhen HYT Science & Technology Co., Ltd. Xiong Lei / Sales Manager

Subject: FCC ID: R74TC-620V2 justification letter for expanded frequency range 136 - 174 MHz Gentlemen; You have asked Shenzhen HYT Science & Technology Co., Ltd. for justification to have the freq range 136 - 174 MHz appears on the face of the FCC Grant of Certification for a Part 90 Certification. This frequency range is regarded as usual & customary by United States Federal Government and its various departments, user organizations and the military to appear on the face of the equipment Grant of Certification. (1) Shenzhen HYT Science & Technology Co., Ltd.’s Marketing Department plans to ensure that USA users, other than those specifically identified in this letter, not operate within bands 136 - 150 MHz, as controlled by the users’ FCC station license. (2) This device will not be marketed to USA users, other than those identified in the letter, namely the US Government and its various departments & military, for operation in 136-150 MHz frequency range. Sincerely, Shenzhen HYT Science & Technology Co., Ltd. Xiong Lei / Sales Manager

Label Location Justification Letter We hereby declare that the Shenzhen HYT Science & Technology Co., Ltd. Two-way Radio of TC-610V(1) which intended to bear the FCC ID: R74TC-620V2, IC: 5465A-TC620V2 shall be marketed as following: 1) The device is handheld. 2) The FCC identifier is visible at the time of purchase. Marketing the device without the battery installed when the label is in the battery compartment is acceptable. The FCC identifier on the box or additional documentation directing the user as to where to find the FCC label also satisfies this requirement. 3) The user accessible area must not require any special tools for access and the FCC label must not be placed on a removable part. (i.e. not on battery cover) 4) The FCC identifier, model no. or FCC logo must be on the label and must meet all general labeling requirements or policies that apply for Certification, Verification or DOC; e.g. for Certification, for handheld devices, the identifier must go on the label but the two part warning statement in Section 15.19(a)3 can go in the manual. Shenzhen HYT Science & Technology Co., Ltd. Xiong Lei / Sales Manager

Top View of EUT Bottom View of EUT Left View of EUT Right View of EUT Front View of EUT Back View of EUT

FCC ID Label FCC RF Warning Label

FCC ID Label Location FCC RF Warning Label

Internal View-1 of EUT Internal View-2 of EUT

TC-610/620 Service Manual 58 Adjustment Description IDiagram of Operation Key (Take TC-610 for example) II Instrument Radio Communication Test Set (HP8921) 1 set 10V/3A DC Regulated Power Supply 1 set Digital Voltmeter 1 set Ammeter 1 set III Preparation Before Adjustment Put the board to be tested on the test clamp and turn the power on. Note: Each test point must be in good contact with the clamp. IV Adjustment Steps 1. Operations Before Adjustment 1）Adjustment of PCB Board After program is downloaded onto the PCB board and EEPROM is initialized with the configuration file (program is downloaded with the test frame and initialization can be done through the programming software or wired clone), check relative specifications at each position. If adjustment is required, connect the programming cable and enter the adjustment mode for PC adjustment 2) Adjustment of Radio Unit 1. Rotate to CH1. Power on the radio while holding down the PTT key and SK2 key for 2s at least. The orange LED (red LED + green LED) lights, indicating the entry into the adjustment mode. Release the keys to enter the corresponding Tx adjustment item (preset power) of the adjustment mode. The red LED lights. Adjust each specification according to the operation instructions. 2. Or connect the programming cable for real time adjustment in PC mode. TC-610/620 Service Manual 63 W Rotate to CH6, CH7 and CH8 respectively and CTCSS is set to low, medium and high respectively. Press PTT to enable this function. Wide band Short press PTT to switch frequencies on each channel. Adjust VR601 with a ceramic alignment screwdriver and check each frequency. Enter the mode to adjust finely with SK1/SK2 to limit the CTCSS deviation to the required range if necessary. 500~900Hz (It is recommended to adjust to 550-650Hz) CTCSS Deviation N Long press PTT (≥1.5s) to enter narrow band on CH6, CH7 and CH8 and short press PTT to switch frequencies. Radio communication test set BPF: <20Hz~300Hz Antenna VR601 SK1 SK2 Enter the mode to adjust finely with SK1/SK2 to limit the CTCSS deviation to the required range if necessary. 300~500Hz TC-610/620 Service Manual 63 W Rotate to CH6, CH7 and CH8 respectively and CTCSS is set to low, medium and high respectively. Press PTT to enable this function. Wide band Short press PTT to switch frequencies on each channel. Adjust VR601 with a ceramic alignment screwdriver and check each frequency. Enter the mode to adjust finely with SK1/SK2 to limit the CTCSS deviation to the required range if necessary. 500~900Hz (It is recommended to adjust to 550-650Hz) CTCSS Deviation N Long press PTT (≥1.5s) to enter narrow band on CH6, CH7 and CH8 and short press PTT to switch frequencies. Radio communication test set BPF: <20Hz~300Hz Antenna VR601 SK1 SK2 Enter the mode to adjust finely with SK1/SK2 to limit the CTCSS deviation to the required range if necessary. 300~500Hz TC-610/620 Service Manual 64 Rotate to CH9. VOX 1 Press SK1 or SK2 to enable the function. Radio communication test set BPF: <20Hz~15kHz AF:1kHz 10mV Adjust with SK1/SK2 and rotate the Channel Selector knob to save after one-point adjustment. Rotate to CH10. VOX 2 Press SK1 or SK2 to enable the function. Radio communication test set BPF: <20Hz~15kHz AF:1kHz 6mV Adjust with SK1/SK2 and rotate the Channel Selector knob to save after one-point adjustment Rotate to CH11. VOX 3 Press SK1 or SK2 to enable the function. Radio communication test set BPF: < 20Hz~15kHz AF:1kHz 4.5mV Adjust with SK1/SK2 and rotate the Channel Selector knob to save after one-point adjustment Rotate to CH12 VOX 4 Press SK1 or SK2 to enable the function. Radio communication test set BPF: < 20Hz~15kHz AF:1kHz 3.5mV Adjust with SK1/SK2 and rotate the Channel Selector knob to save after one-point adjustment VOX Rotate to CH13. VOX 5 Press SK1 or SK2 to enable the function. Radio communication test set BPF: <20Hz~15kHz AF:1kHz 2mV Antenna Accessory jack SK1 SK2 Adjust with SK1/SK2 and rotate the Channel Selector knob to save after one-point adjustment Tx Low Voltage Threshold Digital voltmeter Power supply port Power supply Adjust the output voltage of the power supply and check the alarm level 6.2V-7.0V (≤7.0V: LED flashes; ≤6.2V: a warning tone is heard and transmission is suspended) Rotate to CH8. Low frequency Rx Sensitivity (bandpass) Short press PTT to switch to other frequencies. Radio communication test set SSG: -119dBm MOD: 1KHz DEV: 3.0KHz Filter: 0.3～3KHz Antenna Accessory jack SK1 SK2 Check bandpass waveform . Adjust with SK1/SK2. Rotate the Channel Selector knob to save after five-point adjustment. Check: Rotate the Volume Control knob to an appropriate position to make the output unlimited. SINAD: ≥12dB TC-610/620 Service Manual 65 Rotate to CH1 and SQL level 1 ON is set. Press SK1 or SK2 to enable the function. The channel spacing is wide band. Low frequency Short press PTT to switch frequencies. Radio communication test set SSG: -122dBm MOD: 1KHz DEV: 3KHz Filter: 0.3～ 3KHz Squelch Level 1: -122±1dB Rotate to CH2 and SQL level 5 ON is set. Press SK1 or SK2 to enable the function. The channel spacing is wide band. Low frequency Short press PTT to switch frequencies. Radio communication test set SSG: -119dB MOD: 1KHz DEV: 3KHz Filter: 0.3～ 3KHz Squelch Level 5: -119±1dB W Rotate to CH3 and SQL level 9 ON is set. Press SK1 or SK2 to enable the function. The channel spacing is wide band. Low frequency Short press PTT to switch frequencies. Radio communication test set SSG: 114dBm MOD: 1KHz DEV: 3KHz Filter: 0.3～ 3KHz Antenna Accessory jack SK1 SK2 Adjust the output signals of SSG to squelch level. Rotate the Channel Selector knob to save after five-point adjustment. Squelch Level 9 -114±1dB Radio communication test set SSG: -121dBm MOD: 1KHz DEV: 1.5KHz Filter: 0.3～ 3KHz Squelch Level 1: -121±1dB Radio communication test set SSG: -118dBm MOD: 1KHz DEV: 1.5KHz Filter: 0.3～ 3KHz Squelch Level 5: -118±1dB SQL ON N Long press PTT (≥1.5s) to enter narrow band on the above three…

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FCC Part 90 & RSS-119 TEST REPORT For Two Way Radio Model Name: TC-620V(2) Trade Name: HYT FCC ID: R74TC-620V2, IC: 5465A-TC620V2 Report No.: SZAGC003071102E6 Date of Issue: Dec.18, 2007 Prepared For Shenzhen HYT Science & Technology Co., Ltd. HYT Tower, Shenzhen Hi-Tech Industrial Park North, Beihuan Rd., Nanshan District, Shenzhen, P.R.C. Tel: 86-755-2697 2999 Fax: 86-755-8613 7130 Prepared By Shenzhen Attestation of Global Compliance Science & Technology Co., Ltd Suite B11/B12, 4F, Huafeng Mall, Chuangye 2 nd Road, 25 District, Bao’an, Shenzhen Tel: 86-755-2974 2358 Fax: 86-755-2600 8484 Report No.: SZAGC003071102E6 Page 1 of 49 VERIFICATION OF COMPLIANCE Applicant: SHENZHEN HYT SCIENCE & TECHNOLOGY CO., LTD. HYT Tower, Shenzhen Hi-Tech Industrial Park North, Beihuan Rd., Nanshan District, Shenzhen, P.R.C. Manufacturer: SHENZHEN HYT SCIENCE & TECHNOLOGY CO., LTD. HYT Tower, Shenzhen Hi-Tech Industrial Park North, Beihuan Rd., Nanshan District, Shenzhen, P.R.C. Product Description: Two-way Radio Brand Name: HYT Model Number: TC-620V(2) Serial Number: N/A File Number: SZAGC003071102E6 Date of Test: Dec.05, 2007 ~ Dec.18, 2007 We hereby certify that: The above equipment was tested by Shenzhen Attestation of Global Compliance Science & Technology Co., Ltd. The data evaluation, test procedures, and equipment configurations shown in this report were made in accordance with the procedures given in ANSI C 63.4:2003 and TIA/EIA 603. The sample tested as described in this report is in compliance with the FCC Rules Part 90. The test results of this report relate only to the tested sample identified in this report. Prepared By: Tony Tian Dec.18, 2007 Checked By: Randy He Dec.18, 2007 Authorized By King Zhang Dec.18, 2007 Report No.: SZAGC003071102E6 Page 2 of 49 CONTENTS 1. GENERAL INFORMATION ............................................................................................................................................. 4 1.1 PRODUCT DESCRIPTION ....................................................................................................................................... 4 1.2 RELATED SUBMITTAL(S) / GRANT (S) ................................................................................................................... 5 1.3 TEST METHODOLOGY ............................................................................................................................................ 5 1.4 TEST FACILITY......................................................................................................................................................... 5 1.5 SPECIAL ACCESSORIES......................................................................................................................................... 5 1.6 EQUIPMENT MODIFICATIONS ................................................................................................................................ 5 2. SYSTEM TEST CONFIGURATION................................................................................................................................. 6 2.1 EUT CONFIGURATION ............................................................................................................................................ 6 2.2 EUT EXERCISE ........................................................................................................................................................ 6 2.3 GENERAL TECHNICAL REQUIREMENTS............................................................................................................... 6 2.4 CONFIGURATION OF TESTED SYSTEM................................................................................................................ 6 3. SUMMARY OF TEST RESULTS..................................................................................................................................... 7 4. DESCRIPTION OF TEST MODES .................................................................................................................................. 8 5. CONDUCTED LIMITS (NOT APPLICABLE) .................................................................................................................. 9 5.1 PROVISIONS APPLICABLE ..................................................................................................................................... 9 5.2 MEASUREMENT PROCEDURE............................................................................................................................... 9 5.3 TEST SETUP BLOCK DIAGRAM............................................................................................................................ 10 5.4 TEST EQUIPMENT USED ...................................................................................................................................... 10 5.5 TEST RESULT ........................................................................................................................................................ 11 6. FREQUENCY TOLERANCE ......................................................................................................................................... 12 6.1 PROVISIONS APPLICABLE ................................................................................................................................... 12 6.2 MEASUREMENT PROCEDURE............................................................................................................................. 12 6.3 TEST SETUP BLOCK DIAGRAM ........................................................................................................................... 13 6.4 TEST EQUIPMENT USED: ..................................................................................................................................... 13 6.5 TEST RESULT ........................................................................................................................................................ 13 7. EMISSION BAND…

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RADIATED TEST SETUP