User's Manual

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6. Instruction Manual

1) Safety Information

Safety Information For MURS UNIT

Your wireless handheld portable transceiver contains a low power(2watts)

Transmitter.

When the Push-to Talk (PTT) button is pushed it sends out radio frequency (RF) signals.

This device is authorized to operate at a duty factor not to exceed 50%.

In August 1996, the Federal Communications Commission (FCC) adopted RF exposure

guidelines with safety levels for hand-held wireless devices.

Important Note: To maintain compliance with the FCC's RF exposure guidelines, hold

the transmitter and antenna at least 1 inch (2.5 centimeters) from your face and speak in a

normal voice, with the antenna pointed up and away from the face.

If you wear the handset on your body while using the headset accessory, use only the

manufacturers supplied belt clip for this product and ensure that the antenna is at least 1

inch (2.5 centimeters) from your body when transmitting.

Use only the supplied antenna. Unauthorized antennas, modifications, or attachments

could damage the transmitter and may violate FCC regulations.

THIS DEVICE COMPLIES WITH PART 15 OF THE FCC RULES. OPERATION IS

SUBJECT TO THE FOLLOWING TWO CONDITIONS:

(1) THIS DEVICE MAY NOT CAUSE HARMFUL INTERFERENCE, AND

(2) THIS DEVICE MUST ACCEPT ANY INTERFERENCE RECEIVED, INCLUDING

INTERFERENCE THAT MAY CAUSE UNDESIRED OPERATION.

Summary of content (14 pages)

PAGE 1
6. Instruction Manual 1) Safety Information Safety Information For MURS UNIT Your wireless handheld portable transceiver contains a low power(2watts) Transmitter. When the Push-to Talk (PTT) button is pushed it sends out radio frequency (RF) signals. This device is authorized to operate at a duty factor not to exceed 50%. In August 1996, the Federal Communications Commission (FCC) adopted RF exposure guidelines with safety levels for hand-held wireless devices.
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) General a) General This equipment, MURS is called 2 way portable handheld radios. The frequency range is 151.820¡ ›154.600MHz, VHF operating channels for International 2 way portable radios. b) Characteristic a. All active devices in this radio is composed of semiconductor and high density IC. b. To design this radio in compact and weight approximately 140g including Battery. c. CPU of this equipment is HD4074899TE from HITACHI. d. It’s power can operate by use of alkaline 4 cell (1.5V AA) battery.
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6. Cooling Method: air-cooling Method 7. Spurious Emission: < 60dB 8. FM Hum/Noise: > -40dB(1kHz 60% modulation, w/CCITT) 9. Distortion: < 5% (1kHz 60% modulation) 10. Tx Audio Response: 6dB /OCT ¡ 3dB PRE-EMPHASIS (300Hz¡ ›2.5kHz) b. Receiver 1. Receive Method: Double Super Heterodyne 2. Receive Sensitivity: < 0.28uV(20dB SINAD w/CCITT) 3. Squelch Sensitivity: 6¡ ›8dB(12dB SINAD) 4. Bandwidth: > 3kHz(6dB ATT point) 5. Selectivity: < -60dB(12.5kHz) 6. Local Frequency Stability: ¡ 2.5ppm(-20¡ ¡ ›+60¡ ) 7.
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) Operation a) Key Name a. Function and Controls 1. Antenna 2. Belt Clip 3. Detachable Belt Clip Button 4. Power Switch 5. Mode/Scan Button 6. Vox Button 7. Lock Button 8. Wx Button 9. Built-in Microphone 10. Battery Cover 11. Charge Terminal 12. External Mic/Speaker 13. LCD Display 14. Push-To-Talk (PTT) 15.
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16. Call Button 17. Up Down Button 18. Built-in Speaker b) Icons on LCD a. RSSI (Receiving Signal Strength Indicator) Icon Indicates the receiving signal strength b. Monitor or Receiving Indicator Appears busy icon when the monitor button is long (about 0.5 sec.) used. Short press the Mon button and would be emitting the backlight lamp during 5 seconds. c. CTCSS Indicator Tone digits blink before when the select CTCSS tone CH. d.
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f. VOX Indicator VOX icon blinks in VOX selection mode or appears when VOX is activated. g. Battery Level Indicator Battery Level Meter indicates the remaining battery strength. h. Power Save Display P/SAVE icon blinks when the power save is activated. the rate at which the icon blinks varies with the power saving ratio. j. Rx Indicator Appears and RX icon when a signal is being received. l. Hi/Lo indicator When use Hi/Lo power wanted power state. m.
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c) Key Function a. Power Volume - When power is on, briefly to press the unit on. A short confirming melody will play. b. Mode button - Press this button briefly to enter function edit mode in standby mode. c. Up/Dn button - In the function edit mode, press briefly to shift from the current option in each sub-menu to the next option in the same sub menu. d. Push-to-Talk (PTT) button - Press it firmly and speak into the Built-in Microphone to transmit. - Release it to revert to standby mode.
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higher or lower main channel number. b. CTCSS (Coded Tone Controlled Squelch System) Sub-Channel Selection MODE This feature allows you to utilize a less used channel range (0-38) within a main channel. This enables you to communicate with another party on the same main channel using the same sub-code. This helps to avoid congestion on the main channel and filters out unwanted noise and static. There are 38 CTCSS sub-channels for each main channel.
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g) Lock Selection MODE This feature prevents accidental channel change and disturbance to the preferred settings of the Communicator. Lock temporarily disables the Up, Down Vox,WX and Mode/Scan Buttons. - Press the Lock Button until the lock icon appears in the LCD panel. - Press the Lock Button to confirm the other menu moving with your selection. 5) Adjustment a) Frequency synthesizer (PLL) a. After connecting the power meter and dummy load (50), join the antenna connector of MURS with above equipment.
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b. Connect DC 6.0V, voltage preset to EUT. c. Connect "power meter" & "dummy load (50¥ )". d. Adjust Tx frequency according to trimming trimmer CV401. e. Connect AF oscillator to mic terminal for conform modulation degree. f. Adjust the frequency of AF oscillator to 1KHz and adjust AF level should be 100mV. g. Checking oscilloscope and modulation meter. Max. Frequency deviation should be in ¡ 2.5 KHz. c) Transmitter Test a. Output Power Test Power (6.0V DC) should be Max.2.0W and in +-10% range. b.
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SSG EUT 8§ LOAD OSCILLOSCOPE POWER SUPPLY AV VTVM DISTORTION METER SINAD METER . c. The Confirm of Rx sensitivity 1. Adjust SSG to channel frequency. 2. Adjust modulation frequency, 1KHz to modulation degree, 1.5 KHz. 3. After adjusting the frequency of SSG to channel frequency, RF level sets to -47dBm. d. The Conform of Squelch sensitivity 1. Set the standard channel. 2. After adjusting SSG to channel frequency, the RF level of SSG is set on SINAD 8¡ ›6dB. e) Receiver Test a.
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a. Diagnosis method 1. Check each switch to work well. 2. Check voltage of battery. 3. Problem develops from transmitter or receiver? b. Troubleshooting 1. Transmitter ¤ Power key is on condition but does not work. ¤ ˝ Battery could completely discharge. ¤ ˛ Battery cell twist.. ¤ ˇ Touch problem come between Battery and Radio. ¤ ŁFail to transmit ¤ ˝ Run out of battery or charge problem. ¤ ˛ Fault of PTT key. ¤ ˇ Fault of Q311,321,7.
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6) Specification sheet ¡ Transmitter * Carrier power * Frequency Tolerance * Maximum deviation * Audio distortion * Hum & Noise * TX current * Adjacent channel power * Spurious emission(TX on) ¡ Receiver * Useable sensitivity * 20dB N/Q sensitivity * Squelch sens.
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7) Channel Data (Unit: MHz) Channel TX Frequency 1st Local 1 151.82 130.12 2 151.88 130.18 3 151.94 130.24 4 154.57 132.87 5 154.6 132.9 1 162.55 140.85 2 162.4 140.7 3 162.415 140.715 4 162.425 140.725 5 162.45 140.75 6 162.5 140.8 7 162.525 140.825 8 161.65 139.95 9 161.775 140.075 10 163.275 141.