Columbia Telecommunications Group MURS2 FM Transceiver User Manual MANUAL

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Document ID	163569
Application ID	y2fHw0jO/E62a+pUncpNnQ==
Document Description	Users Manual
Short Term Confidential	No
Permanent Confidential	No
Supercede	No
Document Type	User Manual
Display Format	Adobe Acrobat PDF - pdf
Filesize	18.07kB (225920 bits)
Date Submitted	2001-08-08 00:00:00
Date Available	2001-10-02 00:00:00
Creation Date	0000-00-00 00:00:00
Producing Software	Acrobat PDFWriter 3.0 for Windows
Document Lastmod	2001-06-14 14:59:41
Document Title	MANUAL.PDF
Document Creator	Microsoft Word
Document Author:	S. H. LEE

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.
2) 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.
c) Composition
This radio is composed of following.
a. Transmitter (W/Antenna)
b. Belt clip
c. Ni-MH battery (option)
3) Specification
a) General Specification
a. Frequency Range: 151.820 ¡ -154.600MHz
Weather Range: 161.650 ~ 163.275 (Receiver Only)
b. Output Impedance: 50¥ ØUnbalanced
c. Modulation Type: 8K0F3E
d. Communication Mode: Half duplex
e. Channel Capacity: 5 channels(MURS), 10 channels(WX)
f. Channel spacing: 12.5 KHz
g. Power: 6.0V(alkaline)
h. Battery Life: ALCA.2600mAh >40 hours (Tx5%, Rx5%, Stand-by 90%)
i. Operating Temperature: -20¡ É¡ -+60¡ É
j. Dimension: 95.5(H) x 50(W) x 26(D) mm
k. Weight: 140g(with Battery)
b) Electrical Specification
a. Transmitter
1. Output power: Max. 2.0W
2. Frequency Stability: ¡ ¾2.5 ppm (-20¡ É¡ -+60¡ É)
3. Modulation Method: FM
4. Oscillation Method: PLL SYNTHESIZER
5. Max. Frequency Deviation : < ¡ ¾2.5 KHz (with tone)
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 ¡ ¾3dB 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: ¡ ¾2.5ppm(-20¡ É¡ -+60¡ É)
7. Spurious Response: > 40dB
8. Audio output: 200mW(Internal 8¥ Øload THD 10%) Ext.100mW
9. Distortion: < 5% (1kHz 60% Modulation)
10. RX Audio Response: 6dB/OCT ¡ ¾3dB DE-EMPHASIS (300Hz¡ -2.5kHz)
11. S/N Ratio: < 40dB(1kHz 60% modulation w/CCITT)
12. IF: 1'st IF = 21.7MHz
2'nd IF = 450kHz
13. Local Frequency: 1st Local Frequency = fc - 21.7MHz
2nd Local Frequency = 21.25MHz
4) 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.Monitor Button
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. Auto Channel Scan Indicator
SCAN icon appears in the auto scan mode or when the auto scan mode is
activated.
e. Key Lock Indicator
Blinks in auto lock selection mode or when the key lock is activated.
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. Large Segment Display
Indicates the channel number in use at the normal mode.
When the Function Button is pressed.
n. Small Segment Display
Displays the CTCSS tone option at the normal mode.
o. Roger beep Segment Display
ROGER icon appears when the Roger beep activates.
p. Tx Indicator
Appears and TX icon when a signal is being transmission
r. Appears and WX icon when a signal is being received
(weather band)
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.
When an incoming call is received,
- Call Ringer
Press the CALL Button to call another party on the same channel.
The word CALL will appear in the display.
e. Monitor button
- Press it to check activity on the current channel.
- When you press the Monitor Button, the LCD Panel will be illuminated
with a Green color backlight.
f. External Mic/Speaker
- This jack accepts an optional headset/microphone for totally hands-free
operation.
d) Setting and Operation
a. Basic Channel Selection
In order to communicate with other MURS units, both you and the receiving
party must be on the same channel.
MURS has 5 channels (1-5) as indicated by the large digits in the LCD
Display Panel. Before, trying to transmit on the selected channel, you should
press the Monitor Button to check the activity on that channel. If someone is
already on the selected channel, you should try another channel that is clear.
To change the basic channel,
- In the menu mode, press the Up/Dn button briefly to move to the next
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.
To change the CTCSS sub-channel,
- Press the Function Button until the blink tone digits in the LCD Panel.
- Press the Up/Dn Button to choose the desired sub-channel to use.
The corresponding sub-code CH will be displayed in the lower right corner.
- Press the any button to confirm your selection.
NOTE: To communicate with other MURS units, they must be switched to the
same channel and CTCSS sub-code. To communicate with other MURS
units that do not have sub-codes, switch your unit to the same channel with the
Sub-code set to OFF.
e) AUTO Channel SCAN MODE
This feature allows you to scan for an active channel and communicate with the
party transmitting.
To access the Auto Channel Scan menu,
- Press the scan Button until the auto channel icon blinks and SCAN icon
appears in the LCD Panel.
- Press the Up or Down Button to choose scanning up or down from the current
channel number.
- Press the PTT Button, want to return home CH.
- The unit will begin scanning for an active main channel. If a transmission is
detected, the Rx and RSSI icons will appear in the LCD Panel.
- To turn off the auto channel scan feature in the standby mode, simply press the
CALL button and then CH will be return to home CH.
f) VOX Selection MODE
The Voice Activated Transmission (VOX) function allows your voice to activate
transmission automatically when the Communicator is used with the optional
hands-free mic/headset. It also allows hands-free use when a mic/headset is not
being used without having to use the PTT Button.
To access the VOX Selection menu.
- Press the VOX Button until the VOX icon appears in the LCD Panel.
- Press the VOX Button to select from on or off.
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.
b. Check the voltage between TP1 & GND in digital volt meter.
c. Then set the low channel of MURS the lowest frequency.
d. After pressed PTT key of MURS,trimmer CV71 for adjusting the lowest
frequency of Rx channel to DC 1.0V in the voltage of TP1.
e. After releasing the PTT key, and then check if the highest frequency of Rx
Channel is range DC 1.0~2.5V in the voltage of TP,
f. WX with above equipment
The lowest frequency of Rx channel to DC 1.2V in the voltage of TP1.
b) Transmitter
a. Connect EUT & measure equipment according to block diagram below.
POWER SUPPLY
MODULATION METER
OSCILLOSCOPE
EUT
POWER METER
DUMMY LOAD
AV VTVM
DISTORTION METER
AF OSCILLATOR
SPECTRUM ANALYZER
FREQUENCY COUNTER
b. Connect DC 6.0V, voltage preset to EUT.
c. Connect "power meter" & "dummy load (50¥ Ø)".
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 ¡ ¾2.5 KHz.
c) Transmitter Test
a. Output Power Test
Power (6.0V DC) should be Max.2.0W and in +-10% range.
b. Audio Response
Connect AF oscillator to Mic terminal and then firm the audio level
that doesn't distortion the wave of oscilloscope in the frequency range,
300Hz¡ -3kHz. Check the audio level for 300Hz¡ -3kHz based on frequency
standard, 1kHz.
c. Modulation Degree Test
1. Connect AF oscillator to the MIC terminal and then adjust the level to 100mV
2. Measure the oscilloscope wave and he point needle of modulation meter
after pressing PTT key.
3. Sweep gradually the frequency of AF oscilloscope from 300Hz to 3kHz.
4. At this time, the point needle of modulation meter should be in ¡ ¾2.5 KHz.
d. Spectrum Test
1. Antenna is 50¥ Øand attenuator degree should be 20dB more.
2. observe the spectrum with pressing PTT key. The harmonics should be
less 60 dB than carrier.
d) Receiver
a. Preparation
1. Adjust the power supply to DC 6.0V
2. Adjust Voltage level to 0.8Vrms(8¥ Øload) after power on.
b. Connection method
SSG
EUT
8§ ÙLOAD
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. Rx sensitivity test
SSG should be adjusted to 12dB of SINAD's point needle seeing wave of
oscilloscope as SSG sets in 1kHz with 1.5 KHz frequency deviations. At this
time, normal RF level is -118dBm.
b. Audio Distortion Test
1. SSG should be adjusted like way of point a) and RF level sets to -47dBm.
2. Adjust to 0.8Vrms(8¥ Øload) seeing Audio wave.
3. Read the needle of distortion meter (normal condition would be less
than 5% distortion.)
c. Squelch Test
After RF level of SSG should be set to the least level, RF level should be
gradually increased until speaker makes audio sound. At this point, check RF
level(Check if the SINAD is 8¡ -6dB)
f) Symptoms, Checkpoint & Correction
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
¨ çPower key is on condition but does not work.
¨ ÍBattery could completely discharge.
¨ ÎBattery cell twist..
¨ ÏTouch problem come between Battery and Radio.
¨ èFail to transmit
¨ ÍRun out of battery or charge problem.
¨ ÎFault of PTT key.
¨ ÏFault of Q311,321,7.
¨ éTransmitter works but frequency is unmatched
¨ ÍOut of order in frequency synthesizer.
¨ ÎOut of order in X-tal(X401).
¨ êAudio does not sound(Tx power and Tx frequency are normal)
¨ ÍProblem of microphone or mic connector.
¨ ÎIC U701 problem.
¨ ëTx is set when switch is on.
¨ ÍTx switch problem
2. Receiver
¨ çRx does not work
¨ ÍSpeaker line open problem or connector problem.
¨ ÎReceiver power circuit problem.
¨ ÏAudio amplifier Base band IC U602 problem.
¨ èOnly noise sound
¨ ÍIC U201 problem.
¨ ÎVCO problem.
¨ éRx sensitivity is weak
¨ ÍAntenna mounting problem.
¨ ÎFront-End circuit problem.
¨ ÏLocal oscillation frequency deviation.
¨ ÐF1 saw filter fail.
¨ ÑVCO problem.
¨ êSquelch does not work
¨ ÍIC U201 problem.
¨ ÎControl logic problem.
6) Specification sheet
¡ ßTransmitter
* Carrier power
* Frequency Tolerance
* Maximum deviation
* Audio distortion
* Hum & Noise
* TX current
* Adjacent channel power
* Spurious emission(TX on)
¡ ßReceiver
* Useable sensitivity
* 20dB N/Q sensitivity
* Squelch sens. Threshold
Tight
* Modulation acceptence
* Maximum audio out-put power
* Hum & Noise
* Audio distortion
* Stand-by current w/o saving
w/ saving (1:4)
* Co-channel rejection
* Adjacent channel selectivity
* Spurious response attenuation
* Intermodulation distortion
* RX blocking
* Spurious emission(1M - 1GHz)
(1G - 12GHz)
Operating Time calculations
* Battery type
* Battery Capacity
* TX Current
* Stand-by current
* RX Current
* Operating Times
* TX Talking Times
* TX Power
* Battery Voltage
* TX Efficiency
LIMIT
UNIT
2.0W max.
+/- 1.2KHz
+/- 2.5KHz
5% max.
40dB min.
1000mA max.
60dBc
60dBc
KHz
KHz
dB
mA
dBc
dB
-119dBm min.
-115dBm min.
-128dBm min.
-118dBm max.
Non
7.5KHz min.
100mW min.
40dB min.
5% max.
40mA max.
20mA max.
-12dB
50dB min.
40dB min.
50dB min.
NA
-57dBm max.
-47dBm max.
5 : 5 : 90
AA * 4
2600
1000
40
120
36.2
3.3
2000
28
KHz
mW
dB
mA
mA
dB
dB
dB
dB
dBm
dBm
ALKA
mAH
mA
mA
mA
Hours
Hours
mW
7) Channel Data
(Unit: MHz)
Channel
TX Frequency
1st Local
151.82
130.12
151.88
130.18
151.94
130.24
154.57
132.87
154.6
132.9
162.55
140.85
162.4
140.7
162.415
140.715
162.425
140.725
162.45
140.75
162.5
140.8
162.525
140.825
161.65
139.95
161.775
140.075
10
163.275
141.575
WX

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Creator                         : Microsoft Word
Create Date                     : 2001³â 5¿ù 18ÀÏ Friday 8:29:23 ¿ÀÈÄ
Title                           : MANUAL.PDF
Author                          : S. H. LEE
Producer                        : Acrobat PDFWriter 3.0 for Windows
Subject                         : 
Modify Date                     : 2001:06:14 14:59:41-04:00
Page Count                      : 14

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