O632251LD02FRS/GMRS

2 Changing CHANNELS MONITOR MENU/LOCK Battery Sending Call Tones ..........................................................12 ................................................... ...................... 12 ............................. 12 .............................................................15 Button (FUNCTION EDITING) TRANSMIT POWER SELECTION Mode CHANNEL SCAN Charge Level/Low Battery Indication To Charge the FRS/GMRS ................................... 13 ................................................................. 14 .............................. 14 ...................................................... 15 SPECIFICATIONS CHANNEL TABLE ...................................................................15 .................................................................... 16 .......................................................................21 TROUBLESHOOTING WARRANTY LICENSING .............................................................. 17 ............................................................................18 ..... Removing the Belt Clip Installing the Belt Clip Connecting the Adapter Accessory Connection ........................................................8 .........................................................8 ......................................................8 ........................................................8 Battery Installation LCD Screen Turning the Unit ON Turning the Unit OFF Adjusting Speaker Volume Receiving a Signal Transmitting a Signal .............................................................9 .................................................................... 10 ............................................................ 11 .......................................................... 11 .................................................... 11 ........................................................... 11 .......................................................... 11 OPERATION SPECIAL FEATURES CARE AND SAFETY FCC NOTICE ...................................................3 .....................................................5 ...............................................................7 GETTING STARTED Contents 4 Special FeaturesSpecial Features 1 around buildings or large structures. NOTE:The maximum transmission range will vary depending on terrain and environment. Range will be greater in open fields, while range is shorter within and PRODUCT DESCRIPTION The FRS/GMRS COMMUNICATOR is the newest generation in personal two-way communications. The FRS/GRMS COMMUNICATOR operates in a licensed-free radio band on the FRS channels 8 -14 (no FCC license is needed for its operation), and on licensed FRS/GMRS channels 1 - 7, and GMRS channels 15 - 22 ( see page 22 regarding licensing information). The FRS/GMRS is a lightweight, compact two-way communication device that can be used to communicate with family or friends at parks, shopping malls, sporting events, concerts - any indoor or outdoor activity! The FRS/GMRS is compatible with other brands utilizing the same frequency band (operating in the frequency range from 462.5625MHz The FRS/GMRS has 22-CHANNELS, featuring a multi-functional LCD Screen (which displays the current channel and various status icons). This unit may not ensure privacy of communication. Please read this Owner's Manual carefully to get the most out of your FRS/ GMRS.COMMUNICATOR BellSouthis committed to providing quality products that fit your needs. We would like to have any comments or suggestions you might have on this product. You may mail U.S. Electronics 105 Madison Avenue New York, NY 10016 your comments to: you with years of trouble-free service. to 462.7250 MHz). Congratulations on your selection of a quality . With proper care and adherence to the set-up and user instructions in this Owner's Manual, this unit will provide BellSouth Product BELT CLIP MONITOR button- Press to tune in and hold onto weak signals. UP / DN (DOWN) buttons- Used for changing channels, codes, and setting the receive volume. TALK (PUSH TO TALK) button- Used for making a call. CALL button- Press to transmit a CALL Tones. MIC - Microphone ANTENNA LCD (Liquid Crystal Display) Screen- Displays current channel selection and other radio status symbols. BATTERY COMPARTMENT COVER LATCH(Located on the rear) - Secures BATTERY COMPARTMENT cover. EAR/MIC jack- This jack is used to connect a 3.5 mm stereo headset/mic. POWER ON/OFF buttonPOWER- Press and hold thebutton to turn the unit ON or OFF. MENU /LOCK button- Press to shift into FUNCTION editing mode. Press and hold for 5 seconds to lock the buttons. SPEAKER BATTERY COMPARTMENT- Houses four(4)alkaline or Ni-MH rechargeable batteries (not (Located on the rear) included with the package). SCAN button- Used to activate and deactivate channel scanning. TX LED indicator- Illuminates red when transmitting. TX LED INDICATOR (Pg. 4, 11, 14) ANTENNA (Pgs. 5-7) DOWN BUTTON (VOLUME/CHANNEL) (Pgs. 4, 11-14, 17) POWER ON/OFF BUTTON (Pgs. 4, 9, 11, 14) SPEAKER (Pg. 11) MONITOR BUTTON (Pgs. 4, 11, 12, 17) EAR/MIC/CHARGER JACK (Pgs. 8, 14) mon 2251 BATTERY COMPARTMENT (LOCATED INSIDE) (Pgs. 4, 6, 9) BELT CLIP(LOCATED ON THE REAR) (Pg. 8) LCD SCREEN (Pgs. 4, 10-14, 17) MENU BUTTON (Pgs. 4, 10, 12, 13, 17) SCAN BUTTON (Pg. 4, 13, 14) UP BUTTON (VOLUME/CHANNEL) (Pgs. 4, 11-14, 17) PTT BUTTON (PUSH TO TALK) (Pgs.4, 7, 11-14) menu scan CALL BUTTON (Pg. 4, 12, 14) VX SC Figure 1 Figure 2 Getting Started 8 Removing the BELT CLIP Installing the BELT CLIP Connecting the Adapter 1. Pull the BELT CLIP LATCH away from the unit. 2. While pulling the BELT CLIP LATCH, push up on the BELT CLIP to remove it from the unit, as shown in Figure 1. 1. Slide the BELT CLIP into the BELT CLIP SLOT as shown in Figure 2. package.) Care and SafetyCare and Safety NOTE:Areas with potentially explosive atmospheres are often, but not always, clearly marked. They include fueling areas such as below deck on boats; fuel or chemical…

Text truncated - open the document above for the full version.

2 Changing CHANNELS MONITOR MENU/LOCK Battery Sending Call Tones ..........................................................12 ................................................... ...................... 12 ............................. 12 .............................................................15 Button (FUNCTION EDITING) TRANSMIT POWER SELECTION Mode CHANNEL SCAN Charge Level/Low Battery Indication To Charge the FRS/GMRS ................................... 13 ................................................................. 14 .............................. 14 ...................................................... 15 SPECIFICATIONS CHANNEL TABLE ...................................................................15 .................................................................... 16 .......................................................................21 TROUBLESHOOTING WARRANTY LICENSING .............................................................. 17 ............................................................................18 ..... Removing the Belt Clip Installing the Belt Clip Connecting the Adapter Accessory Connection ........................................................8 .........................................................8 ......................................................8 ........................................................8 Battery Installation LCD Screen Turning the Unit ON Turning the Unit OFF Adjusting Speaker Volume Receiving a Signal Transmitting a Signal .............................................................9 .................................................................... 10 ............................................................ 11 .......................................................... 11 .................................................... 11 ........................................................... 11 .......................................................... 11 OPERATION SPECIAL FEATURES CARE AND SAFETY FCC NOTICE ...................................................3 .....................................................5 ...............................................................7 GETTING STARTED Contents 4 Special FeaturesSpecial Features 1 around buildings or large structures. NOTE:The maximum transmission range will vary depending on terrain and environment. Range will be greater in open fields, while range is shorter within and PRODUCT DESCRIPTION The FRS/GMRS COMMUNICATOR is the newest generation in personal two-way communications. The FRS/GRMS COMMUNICATOR operates in a licensed-free radio band on the FRS channels 8 -14 (no FCC license is needed for its operation), and on licensed FRS/GMRS channels 1 - 7, and GMRS channels 15 - 22 ( see page 22 regarding licensing information). The FRS/GMRS is a lightweight, compact two-way communication device that can be used to communicate with family or friends at parks, shopping malls, sporting events, concerts - any indoor or outdoor activity! The FRS/GMRS is compatible with other brands utilizing the same frequency band (operating in the frequency range from 462.5625MHz The FRS/GMRS has 22-CHANNELS, featuring a multi-functional LCD Screen (which displays the current channel and various status icons). This unit may not ensure privacy of communication. Please read this Owner's Manual carefully to get the most out of your FRS/ GMRS.COMMUNICATOR BellSouthis committed to providing quality products that fit your needs. We would like to have any comments or suggestions you might have on this product. You may mail U.S. Electronics 105 Madison Avenue New York, NY 10016 your comments to: you with years of trouble-free service. to 462.7250 MHz). Congratulations on your selection of a quality . With proper care and adherence to the set-up and user instructions in this Owner's Manual, this unit will provide BellSouth Product BELT CLIP MONITOR button- Press to tune in and hold onto weak signals. UP / DN (DOWN) buttons- Used for changing channels, codes, and setting the receive volume. TALK (PUSH TO TALK) button- Used for making a call. CALL button- Press to transmit a CALL Tones. MIC - Microphone ANTENNA LCD (Liquid Crystal Display) Screen- Displays current channel selection and other radio status symbols. BATTERY COMPARTMENT COVER LATCH(Located on the rear) - Secures BATTERY COMPARTMENT cover. EAR/MIC jack- This jack is used to connect a 3.5 mm stereo headset/mic. POWER ON/OFF buttonPOWER- Press and hold thebutton to turn the unit ON or OFF. MENU /LOCK button- Press to shift into FUNCTION editing mode. Press and hold for 5 seconds to lock the buttons. SPEAKER BATTERY COMPARTMENT- Houses four(4)alkaline or Ni-MH rechargeable batteries (not (Located on the rear) included with the package). SCAN button- Used to activate and deactivate channel scanning. TX LED indicator- Illuminates red when transmitting. LCD SCREEN (Pgs. 4, 10-14, 17) TX LED INDICATOR (Pg. 4, 11, 14) ANTENNA (Pgs. 5-7) DOWN BUTTON (VOLUME/CHANNEL) (Pgs. 4, 11-14, 17) POWER ON/OFF BUTTON (Pgs. 4, 9, 11, 14) MENU BUTTON (Pgs. 4, 10, 12, 13, 17) SCAN BUTTON (Pg. 4, 13, 14) SPEAKER (Pg. 11) MONITOR BUTTON (Pgs. 4, 11, 12, 17) UP BUTTON (VOLUME/CHANNEL) (Pgs. 4, 11-14, 17) PTT BUTTON (PUSH TO TALK) (Pgs.4, 7, 11-14) EAR/MIC/CHARGER JACK (Pgs. 8, 14) menu scan mon 2251 BATTERY COMPARTMENT (LOCATED INSIDE) (Pgs. 4, 6, 9) BELT CLIP(LOCATED ON THE REAR) (Pg. 8) CALL BUTTON (Pg. 4, 12, 14) Figure 1 Figure 2 Getting Started 8 Removing the BELT CLIP Installing the BELT CLIP Connecting the Adapter 1. Pull the BELT CLIP LATCH away from the unit. 2. While pulling the BELT CLIP LATCH, push up on the BELT CLIP to remove it from the unit, as shown in Figure 1. 1. Slide the BELT CLIP into the BELT CLIP SLOT as shown in Figure 2. package.) Care and SafetyCare and Safety NOTE:Areas with potentially explosive atmospheres are often, but not always, clearly marked. They include fueling areas such as below deck on boats; fuel or chemical trans…

Text truncated - open the document above for the full version.

2 Changing CHANNELS MONITOR MENU/LOCK Battery Sending Call Tones ..........................................................12 ................................................... ...................... 12 ............................. 12 .............................................................15 Button (FUNCTION EDITING) TRANSMIT POWER SELECTION Mode CHANNEL SCAN Charge Level/Low Battery Indication To Charge the FRS/GMRS ................................... 13 ................................................................. 14 .............................. 14 ...................................................... 15 SPECIFICATIONS CHANNEL TABLE ...................................................................15 .................................................................... 16 .......................................................................21 TROUBLESHOOTING WARRANTY LICENSING .............................................................. 17 ............................................................................18 ..... Removing the Belt Clip Installing the Belt Clip Connecting the Adapter Accessory Connection ........................................................8 .........................................................8 ......................................................8 ........................................................8 Battery Installation LCD Screen Turning the Unit ON Turning the Unit OFF Adjusting Speaker Volume Receiving a Signal Transmitting a Signal .............................................................9 .................................................................... 10 ............................................................ 11 .......................................................... 11 .................................................... 11 ........................................................... 11 .......................................................... 11 OPERATION SPECIAL FEATURES CARE AND SAFETY FCC NOTICE ...................................................3 .....................................................5 ...............................................................7 GETTING STARTED Contents 4 Special FeaturesSpecial Features 1 around buildings or large structures. NOTE:The maximum transmission range will vary depending on terrain and environment. Range will be greater in open fields, while range is shorter within and PRODUCT DESCRIPTION The FRS/GMRS COMMUNICATOR is the newest generation in personal two-way communications. The FRS/GRMS COMMUNICATOR operates in a licensed-free radio band on the FRS channels 8 -14 (no FCC license is needed for its operation), and on licensed FRS/GMRS channels 1 - 7, and GMRS channels 15 - 22 ( see page 22 regarding licensing information). The FRS/GMRS is a lightweight, compact two-way communication device that can be used to communicate with family or friends at parks, shopping malls, sporting events, concerts - any indoor or outdoor activity! The FRS/GMRS is compatible with other brands utilizing the same frequency band (operating in the frequency range from 462.5625MHz The FRS/GMRS has 22-CHANNELS, featuring a multi-functional LCD Screen (which displays the current channel and various status icons). This unit may not ensure privacy of communication. Please read this Owner's Manual carefully to get the most out of your FRS/ GMRS.COMMUNICATOR BellSouthis committed to providing quality products that fit your needs. We would like to have any comments or suggestions you might have on this product. You may mail U.S. Electronics 105 Madison Avenue New York, NY 10016 your comments to: you with years of trouble-free service. to 462.7250 MHz). Congratulations on your selection of a quality . With proper care and adherence to the set-up and user instructions in this Owner's Manual, this unit will provide BellSouth Product BELT CLIP MONITOR button- Press to tune in and hold onto weak signals. UP / DN (DOWN) buttons- Used for changing channels, codes, and setting the receive volume. TALK (PUSH TO TALK) button- Used for making a call. CALL button- Press to transmit a CALL Tones. MIC - Microphone ANTENNA LCD (Liquid Crystal Display) Screen- Displays current channel selection and other radio status symbols. BATTERY COMPARTMENT COVER LATCH(Located on the rear) - Secures BATTERY COMPARTMENT cover. EAR/MIC jack- This jack is used to connect a 3.5 mm stereo headset/mic. POWER ON/OFF buttonPOWER- Press and hold thebutton to turn the unit ON or OFF. MENU /LOCK button- Press to shift into FUNCTION editing mode. Press and hold for 5 seconds to lock the buttons. SPEAKER BATTERY COMPARTMENT- Houses four(4)alkaline or Ni-MH rechargeable batteries (not (Located on the rear) included with the package). SCAN button- Used to activate and deactivate channel scanning. TX LED indicator- Illuminates red when transmitting. LCD SCREEN (Pgs. 4, 10-14, 17) TX LED INDICATOR (Pg. 4, 11, 14) ANTENNA (Pgs. 5-7) DOWN BUTTON (VOLUME/CHANNEL) (Pgs. 4, 11-14, 17) POWER ON/OFF BUTTON (Pgs. 4, 9, 11, 14) MENU BUTTON (Pgs. 4, 10, 12, 13, 17) SCAN BUTTON (Pg. 4, 13, 14) SPEAKER (Pg. 11) MONITOR BUTTON (Pgs. 4, 11, 12, 17) UP BUTTON (VOLUME/CHANNEL) (Pgs. 4, 11-14, 17) PTT BUTTON (PUSH TO TALK) (Pgs.4, 7, 11-14) EAR/MIC/CHARGER JACK (Pgs. 8, 14) menu scan mon 2251 BATTERY COMPARTMENT (LOCATED INSIDE) (Pgs. 4, 6, 9) BELT CLIP(LOCATED ON THE REAR) (Pg. 8) CALL BUTTON (Pg. 4, 12, 14) Figure 1 Figure 2 Getting Started 8 Removing the BELT CLIP Installing the BELT CLIP Connecting the Adapter 1. Pull the BELT CLIP LATCH away from the unit. 2. While pulling the BELT CLIP LATCH, push up on the BELT CLIP to remove it from the unit, as shown in Figure 1. 1. Slide the BELT CLIP into the BELT CLIP SLOT as shown in Figure 2. package.) Care and SafetyCare and Safety NOTE:Areas with potentially explosive atmospheres are often, but not always, clearly marked. They include fueling areas such as below deck on boats; fuel or chemical trans…

Text truncated - open the document above for the full version.

2 Changing CHANNELS MONITOR MENU/LOCK Battery Sending Call Tones ..........................................................12 ................................................... ...................... 12 ............................. 12 .............................................................15 Button (FUNCTION EDITING) TRANSMIT POWER SELECTION Mode CHANNEL SCAN Charge Level/Low Battery Indication To Charge the FRS/GMRS ................................... 13 ................................................................. 14 .............................. 14 ...................................................... 15 SPECIFICATIONS CHANNEL TABLE ...................................................................15 .................................................................... 16 .......................................................................21 TROUBLESHOOTING WARRANTY LICENSING .............................................................. 17 ............................................................................18 ..... Removing the Belt Clip Installing the Belt Clip Connecting the Adapter Accessory Connection ........................................................8 .........................................................8 ......................................................8 ........................................................8 Battery Installation LCD Screen Turning the Unit ON Turning the Unit OFF Adjusting Speaker Volume Receiving a Signal Transmitting a Signal .............................................................9 .................................................................... 10 ............................................................ 11 .......................................................... 11 .................................................... 11 ........................................................... 11 .......................................................... 11 OPERATION SPECIAL FEATURES CARE AND SAFETY FCC NOTICE ...................................................3 .....................................................5 ...............................................................7 GETTING STARTED Contents 4 Special FeaturesSpecial Features 1 around buildings or large structures. NOTE:The maximum transmission range will vary depending on terrain and environment. Range will be greater in open fields, while range is shorter within and PRODUCT DESCRIPTION The FRS/GMRS COMMUNICATOR is the newest generation in personal two-way communications. The FRS/GRMS COMMUNICATOR operates in a licensed-free radio band on the FRS channels 8 -14 (no FCC license is needed for its operation), and on licensed FRS/GMRS channels 1 - 7, and GMRS channels 15 - 22 ( see page 22 regarding licensing information). The FRS/GMRS is a lightweight, compact two-way communication device that can be used to communicate with family or friends at parks, shopping malls, sporting events, concerts - any indoor or outdoor activity! The FRS/GMRS is compatible with other brands utilizing the same frequency band (operating in the frequency range from 462.5625MHz The FRS/GMRS has 22-CHANNELS, featuring a multi-functional LCD Screen (which displays the current channel and various status icons). This unit may not ensure privacy of communication. Please read this Owner's Manual carefully to get the most out of your FRS/ GMRS.COMMUNICATOR BellSouthis committed to providing quality products that fit your needs. We would like to have any comments or suggestions you might have on this product. You may mail U.S. Electronics 105 Madison Avenue New York, NY 10016 your comments to: you with years of trouble-free service. to 462.7250 MHz). Congratulations on your selection of a quality . With proper care and adherence to the set-up and user instructions in this Owner's Manual, this unit will provide BellSouth Product BELT CLIP MONITOR button- Press to tune in and hold onto weak signals. UP / DN (DOWN) buttons- Used for changing channels, codes, and setting the receive volume. TALK (PUSH TO TALK) button- Used for making a call. CALL button- Press to transmit a CALL Tones. MIC - Microphone ANTENNA LCD (Liquid Crystal Display) Screen- Displays current channel selection and other radio status symbols. BATTERY COMPARTMENT COVER LATCH(Located on the rear) - Secures BATTERY COMPARTMENT cover. EAR/MIC jack- This jack is used to connect a 3.5 mm stereo headset/mic. POWER ON/OFF buttonPOWER- Press and hold thebutton to turn the unit ON or OFF. MENU /LOCK button- Press to shift into FUNCTION editing mode. Press and hold for 5 seconds to lock the buttons. SPEAKER BATTERY COMPARTMENT- Houses four(4)alkaline or Ni-MH rechargeable batteries (not (Located on the rear) included with the package). SCAN button- Used to activate and deactivate channel scanning. TX LED indicator- Illuminates red when transmitting. LCD SCREEN (Pgs. 4, 10-14, 17) TX LED INDICATOR (Pg. 4, 11, 14) ANTENNA (Pgs. 5-7) DOWN BUTTON (VOLUME/CHANNEL) (Pgs. 4, 11-14, 17) POWER ON/OFF BUTTON (Pgs. 4, 9, 11, 14) MENU BUTTON (Pgs. 4, 10, 12, 13, 17) SCAN BUTTON (Pg. 4, 13, 14) SPEAKER (Pg. 11) MONITOR BUTTON (Pgs. 4, 11, 12, 17) UP BUTTON (VOLUME/CHANNEL) (Pgs. 4, 11-14, 17) PTT BUTTON (PUSH TO TALK) (Pgs.4, 7, 11-14) EAR/MIC/CHARGER JACK (Pgs. 8, 14) menu scan mon 2251 BATTERY COMPARTMENT (LOCATED INSIDE) (Pgs. 4, 6, 9) BELT CLIP(LOCATED ON THE REAR) (Pg. 8) CALL BUTTON (Pg. 4, 12, 14) Figure 1 Figure 2 Getting Started 8 Removing the BELT CLIP Installing the BELT CLIP Connecting the Adapter 1. Pull the BELT CLIP LATCH away from the unit. 2. While pulling the BELT CLIP LATCH, push up on the BELT CLIP to remove it from the unit, as shown in Figure 1. 1. Slide the BELT CLIP into the BELT CLIP SLOT as shown in Figure 2. package.) Care and SafetyCare and Safety NOTE:Areas with potentially explosive atmospheres are often, but not always, clearly marked. They include fueling areas such as below deck on boats; fuel or chemical trans…

Text truncated - open the document above for the full version.

Lionda Technology Company Limited FCC ID: O632251LD02 Report # R0206114FCC Part 95 Test Report EUT External Photographs EUT - Top View EUT - Front View Lionda Technology Company Limited FCC ID: O632251LD02 Report # R0206114FCC Part 95 Test Report EUT - Rear View EUT – Right View Lionda Technology Company Limited FCC ID: O632251LD02 Report # R0206114FCC Part 95 Test Report EUT – Left View

Lionda Technology Company Limited FCC ID: O632251LD02 Report # R0206114FCC Part 95 Test Report Proposed FCC ID Labeling FCC ID: O632251LD02

Lionda Technology Company Limited FCC ID: O632251LD02 Report # R0206114FCC Part 95 Test Report Proposed FCC ID Location Rear Side of EUT Proposed FCC ID Location label here

Lionda Technology Company Limited FCC ID: O632251LD02 Report # R0206114FCC Part 95 Test Report EUT Internal Photographs EUT – Component View EUT – Solder View

LIONDA TECHNOLOGY COMPANY LIMITED Lionda Research and Development Center 2251seriesdesc Page 1 6/14/02 CIRCUIT DESCRIPTION Model: FRS 2251 (2Watt) a. Receiver Section Radio Frequency signal received by the antenna (ANT1), passing through the Low Pass Filter (L2-L3, C30-C31). The RF signal is then amplified by Low Noise Amplifier Q2 and passes through a Band Pass Filter FL1 (465MHz). The filtered signal within the range of 462 MHz – 467 MHz is then mixed with the first local oscillator signal from the Voltage Controlled Oscillator (VCO) circuit (Q19-Q21, D5, L17) through Q11, a portion of VCO signal is then feedback to the PLL IC (IC5) for phase comparison generating a stable RX Frequency, the output signal is filtered by FL2 (21.7 MHz) which is the first Intermediate Frequency (IF) and is then amplified by Q14. The IF signal is fed to the discriminator IC (IC2) pin 16 which is then mixed with the second local oscillator supplied by crystal X2 (21.65 MHz) to produced and reduced second IF signal. Demodulated signal is recovered through correct adjustment of IF coil (L13) and the internal discriminator circuit of IC2. The recovered Audio signal is outputted at pin 9 of IC2 and then processed through filtering done by U3-D circuit, the fully recovered audio signal is then further amplified by Power Amplifier U3-A. An audible sound is therefore produce by the speaker SPK1, which can be varied from minimum to maximum through the key function (up/down) and process by the CPU IC6. b. Transmitter Section PTT switch when pushed triggers the Transmitter Circuit “ON”, the voice signal generates by the surrounding noise passes through the Microphone MIC1 where mechanical to electrical transformation occurs, the electrical transformed signal is then filtered by a Band Pass Filter U3-A, D, and C. The output signal is Modulated by a modulator circuit with a varactor diode D8 and L17. The external components from Q19-Q21 form a VCO Circuit, which generates the required oscillating frequency for transmission; a portion of this signal is feedback to the PLL IC5 pin 14 for phase comparison in order to produce a stabilized TX frequency. The modulated signal is then amplified by a Cascaded Amplifier Circuit Q17 and Q18 and again amplified by Q24 to produce a sufficient Radio Frequency signal emitted by the Antenna (ANT1). c. Call Transmission By pushing the CALL key, a signal is detected by the CPU (IC6), a CALL data is then produced by the CPU. This data passes through the Band Pass Filter U1-C and modulated by the varactor diode D2 and L8. The signal follows it’s conventional transmission section path through the antenna. d. Continuous Tone Coded Squelch Signal Protocol Once the unit is set to the corresponding Channel and CTCSS code at TX mode a tone is continuously generated from CPU through R96 and R103 and then passes through U1C for filtering and amplification. Then the Coded Tone signal follows its conventional transmission section path. During receiving mode once the Coded Tone signal matched with the set Code the CPU acknowledges and RX mute will disabled and RX will be active. LIONDA TECHNOLOGY COMPANY LIMITED Lionda Research and Development Center 2251seriesdesc Page 2 6/14/02 e. Battery Low Detection Battery Low Detection is controlled by the IC6 as detected on the LCD1, however a voltage divider circuit R50 and R51 serve as the stabilize reference voltage for the IC6 to process its detection. f. Squelch Detection Supported by the linear IC circuit (IC2), a variable resistor VR1 sets the level of detection and Diode D11 acts as a comparator circuit interface with the CPU IC6. g. Power Supply Supply voltage of 6 Volts dc is needed to power “ON” the whole circuitry, by four (4) batteries “AAA” size. FREQUENCY CHART CHANNEL DISPLAY CHANNEL TYPE FREQ (MHz) POWER (Watts) CHANNEL DISPLAY CHANNEL TYPE FREQ (MHz) POWER (Watts) 1 GMRS/FRS 462.5625 2 12 FRS 467.6625 0.5 2 GMRS/FRS 462.5875 2 13 FRS 467.6875 0.5 3 GMRS/FRS 462.6125 2 14 FRS 467.7125 0.5 4 GMRS/FRS 462.6375 2 15 GMRS 462.5500 2 5 GMRS/FRS 462.6625 2 16 GMRS 462.5750 2 6 GMRS/FRS 462.6875 2 17 GMRS 462.6000 2 7 GMRS/FRS 462.7125 2 18 GMRS 462.6250 2 8 FRS 467.5625 0.5 19 GMRS 462.6500 2 9 FRS 467.5875 0.5 20 GMRS 462.6750 2 10 FRS 467.6125 0.5 21 GMRS 462.7000 2 11 FRS 467.6375 0.5 22 GMRS 462.7250 2 CTCSS CODE FREQUENCY CHART CODE FREQUENCY (Hz) CODE FREQUENCY (Hz) 1 67.0 20 131.8 2 71.9 21 136.5 3 74.4 22 141.3 4 77.0 23 146.2 5 79.7 24 151.4 6 82.5 25 156.7 7 85.4 26 162.2 8 88.5 27 167.9 9 91.5 28 173.8 10 94.8 29 179.9 11 97.4 30 186.2 12 100.0 31 192.8 13 103.5 32 203.5 14 107.2 33 210.7 15 110.9 34 218.1 16 114.8 35 225.7 17 118.8 36 233.6 18 123.0 37 241.8 19 127.3 38 250.3

Lionda Research and Development Center CIRCUIT DESCRIPTION Model: FRS/GMRS 2251 (0.5watt~1watt) a. Receiver Section Radio Frequency signal received by the antenna (ANT1), passing through the Low Pass Filter (L2-L3, C30-C31). The RF signal is then amplified by Low Noise Amplifier Q2 and passes through a Band Pass Filter FL1 (465MHz). The filtered signal within the range of 462 MHz – 467 MHz is then mixed with the first loca…

Text truncated - open the document above for the full version.