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GMRS X1

SERVICE MANUAL

TABLE OF CONTENTS

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Summary of Contents for GMRS X1

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

Page 2: ...NT 8 5 OPERATIONAL TEST 9 1 INTRODUCTION 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 Like other HJC quality products GMRS X1 carries a 12 months limited warranty Please call our technical...

Page 3: ... 4 Spurious Harmonics 60dBc 5 Audio Distortion Less than 5 1KHz tone 6 0 modulation C RECEIVER 1 Sensitivity 12dB SINAD 0 25Uv 119dBm SINAD 2 Selectivity 60dB 3 Inter modulation 60dB 4 Spurious and image rejection 60dB 5 Maximum Audio Output More than 200mW 6 Audio Distortion less than 5 3 THERORY OF OPERATION INTRODUCTION GMRS X1 is a micro size15 channel portable FM transceiver constructed with ...

Page 4: ...ariable by applying the VCO control voltage to variable to variable capacitors D304 2 TRANSMITTER MIC AMP CIRCUIT Voice signal from the microphone is applied to microphone amplifier U506 contains a high pass filter low pass filter that has a 6dB oct response between 300Hz and 3 kHz and eliminates hamonics above 3 kHz The pre emphasized audio signal is applied to VR501 to adjust maximum frequency d...

Page 5: ...in 9 AUDIO AND SQUELCH CIRCUIT The detected audio signals are put through a 6dB oct de emphasis circuit made up of C507 and R519 The signal is then applied to audio power amplifier U505 through the volume control U507 to obtain enough power to driver the speaker Part of the recovered noise signal is fed to the integrated operational amplifier inside U401 which with C403 R405 C405 C404 R406 makes u...

Page 6: ...WN BUTTON to select the channel and option in mode operation 6 INTERCOM BUTTON to go INTERCOM mode and to monitor 7 VOLUM DOWN BUTTON to reduce the volume level 8 VOLUM UP BUTTON to increase the volume level 9 BATTERY 10 POWER ON OFF KNOB to power on or off and to select VOX level 11 EXTERNAL SPEAKER MIC SOCKET to connect to external speaker mic 12 INTERCOM SPEAKER MIC SOCKET to connect to INTERCO...

Page 7: ...e the desired tone number with pressing UP DOWN BUTTON Press PTT BUTTON to complete 5 beep ON OFF select Press MODE BUTTON two times Choose BEEP ON or OFF with pressing UP DOWN BUTTON and press PTT BUTTON to complete BEEP ON BEEP OFF 6 key lock ON OFF select Press MODE BUTTON three times Choose key lock ON OFF with pressing UP DOWN BUTTON and press PTT BUTTON to complete KEY LOCK ON KEY LOCK OFF 7...

Page 8: ... 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 Relative Humidity 65 Power Supply Voltage 4 8VDC 5 Test Equipment Tools req...

Page 9: ...ror is within 250Hz adjust with VC301 Transmitter Output Power Activate PTT to transmit on CH1 Set adjust with VR201 for 2W power output at ANT1 Repeat test on Ch8 Transmitter Deviation Limit Set radio to transmit on CH1 with CTCSS code 38 250 3Hz and no audio modulation At the external microphone input inject 1KHz tone at 20dBm Adjust VR501 for 2 0KHz deviation Reduce 1KHz tone input to 40dBm che...

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