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ChatterBox GMRS X1 Service Manual

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GMRS X1
SERVICE MANUAL
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Summary of Contents for ChatterBox GMRS X1

  • Page 1 GMRS X1 SERVICE MANUAL TABLE OF CONTENTS...

  • Page 2: Table Of Contents

    GMRS X1 is FM handhold transceiver operating 462MHz. With the output power of 2 W ERP, the radio is capable of communicating up to 5 miles. In addition to its small size, GMRS X1 offers many advanced features that could only be found in the most expensive GMRS.

  • Page 3: Technical Specifications

    3. THERORY OF OPERATION INTRODUCTION GMRS X1 is a micro size15 channel portable FM transceiver constructed with a microprocessor controlled, temperature compensated Phase Locked Loop (PLL) frequency synthesizer. The radio features a double conversion receiver and a direct FM transmitter modulator. A special integrated circuit provides support to sub-audible signaling (CTCSS) and most of the receiving parts are switched off periodically in the power saver mode to reduce battery current drain during standby.

  • Page 4: Circuit Descriptions

    The Block Diagram RF and Control Circuit Diagrams for GMRS X1 shall be used in associate with the following circuit description. CIRCUIT DESCRIPTIONS 1) PHASE-LOCK LOOP (PLL) CIRCUIT * REFERENCE OSCILLATOR The reference oscillator consists of X301 in U301 with a frequency of 12.8MHz.

  • Page 5: Operation

    Jack J506 receives external AUDIO, and amplifies in U505. When RF signal is received, AUDIO IN switch of U504 is off, then it receives RF signal. OPERATION Please refer to the user’s manual for details HJC-GMRS X1 user’s manual description...
  • Page 6 (1) LCD description MODE INTERCOM MODE SCAN MODE BATTERY BEEP KEY LOCK CTCSS SUB TONE CHANNEL (2) PTT button hold down to transmit and release to receive. (3) MODE button press to go several mode. (4) UP BUTTON to select the channel and option in mode operation. (5) DOWN BUTTON to select the channel and option in mode operation.
  • Page 7 (16) HAND FREE SOCKET to connect the telephone Operation power ON/OFF Turn the transceiver on by rotating switch in a clockwise direction. 1) channel select Choose the desired channel with pressing UP/DOWN BUTTON, and press PTT BUTTON to complete 2) volume level select Choose the desired volume level with VOLUME UP/DOWN BUTTON, and press PTT BUTTON to complete.

  • Page 8: Alignment Procedure

    Connect the telephone to HAND FREE SOCKET. When the telephone signal comes, press the MONITER BUTTON to receive with hand free. Press MONITOER BUTTON again to finish. 4. Alignment Procedure Measurement Condition The following sections describes the alignment procedure for GMRS X1 transceiver under the following reference environment conditions: Temperature 25℃ (77℉)

  • Page 9: Transmitter Adjustment

    External Speaker Mic plug (or special audio test jig) Interconnection test cable for RF and Control PCB Circuit Diagram for GMRS X1 PCB layout diagram for GMRS X1 Tuning tools for RF/IF transformer and the VR potentiometers Transmitter Adjustment - X-TAL frequency On receiving mode, check X-TAL(X301)output (pin 2) is at 12.8MHz...

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