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tti Tech FRS 3000-PK Service Manual

2-way portable handheld radio
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FRS 3000-PK
SERVICE
MANUAL
2-WAY PORTABLE
HANDHELD
RADIO
OCTOBER 19, 2001
1/21

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Summary of Contents for tti Tech FRS 3000-PK

  • Page 1 FRS 3000-PK SERVICE MANUAL 2-WAY PORTABLE HANDHELD RADIO OCTOBER 19, 2001 1/21...

  • Page 2: Table Of Contents

    CONTENT 1. GENERAL 1.1 General 1.2 Characteristic 1.3 Composition 2. SPECIFICATION 2.1 General Specification 2.2 Electrical Specification 3. OPERATION 3.1 ICON on LCD 3.2 Key Functions 3.3 Setting and Operation 4. ADJUSTMENT 4.1 Frequency synthesizer 4.2 Transmitter 4.3 Transmitter Test 4.4 Receiver 4.5 Receiver Test 4.6 Symptoms, check point &...

  • Page 3: General

    1. GENERAL 1.1 GENERAL This equipment, FRS 3000-PK is called 2 way portable handheld radios. The frequency range is 462 ~ 467MHz, UHF operating Channels for international 2 way radio. Also it has a 38 CTCSS feature to get the clear communication without interference.

  • Page 4: Specification

    2. SPECIFICATION 2.1 GENERAL SPECIFICATIONS a) Frequency range : 462.5625 ~ 467.7125 MHz b) Output Impedance : 50Ω Unbalanced c) Modulation Type : 8K0F3E d) Communication Mode : Half duplex e) Channel Capacity : 14 channel f) Channel Spacing : 12.5 kHz g) Power : 6.0V(alkaline) h) Battery Life : Alkaline.1000mAh >14.5hours (Tx5%, Rx5%, Stand-by90%) i) Operating Temperature : -20°C ~ +60°C...

  • Page 5: Operation

    3. OPERATION 3.1 ICONS on LCD 1) Monitor indicator : Appears when the CTCSS isn’t in use and squelch is open. 2) Key lock indicator : Indicates that the key lock function is in use. 3) Beep ON/OFF indicator : Appears while key tone is in use. 4) Roger On/Off indicator : Appears while Roger tone is in use.
  • Page 6 1) PTT switch : Push and hold to transmit ; release to receive. 2) Monitor : Press and hold this key for over 2 seconds to enable the receive CTCSS feature. 3) Up/Down key : In the stand-by mode, Pressing this button will increment or decrement the listening volume.
  • Page 7 button is pressed, the LED will light red. These LED’s are used for backlighting as well. 9)External speaker/mic jacks : Connect an optional speaker/mic or headset, if desired. The internal mic and speaker will not function when either is connected. 2) Function display Monitor Indicator: Icon appears when the monitor button is pressed and the channel monitor function is activated.

  • Page 8: Setting And Operation

    In order to communicate with other FRS units, both you and the receiving party must be on the same channel. FRS 3000-PK has 14channels indicated by the large digits on 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.
  • Page 9 To select the channel * Turn the radio on. * Press MODE button once, [XX] digit will blink on the LCD. XX is a channel. * Press up[ù]or down[ü] button to choose the channel. * Press the PTT button or MODE button to confirm. To set the tone codes(CTCSS) * Press MODE button once more, [XX up to...
  • Page 10 “01 up to 15” means the channel that is dual-watched. * Press the PTT button or MODE button to confirm. 5) Roger tone This feature will give the tone signal to other parties when transmitting finished (when PTT button is released.) To activate or disable the Roger tone * Press the Mode button until [rb on or oF] and the roger icon blink on the LCD.
  • Page 11 Call Ringer Selection Mode This feature Provides 3 user selectable call ringer signal. To set your favorite call ringer signal. * Press the MODE button until the [C or up to ] appears on the LCD. * Press the up[ù]or down[ü] button to select the call melody type. * Press the PTT button to confirm.
  • Page 12 14) Monitoring the Channel It is used for listening the week signal or to here all activities on the channel by Manually overriding channel sub tone code setting. To activate the monitor feature * Press and hold the “MON”(monitor) button for over two seconds. * When you hear the sound, release the “MON”...

  • Page 13: Adjustment

    Then set the low channel of FRS 3000-PK the lowest frequency. d) After pressed PTT key of FRS 3000-PK, check if the lowest frequency of Tx channel to DC 1.5V in the voltage of test point(VT). e) After releasing the PTT key of FRS 3000-PK, check if the highest frequency of Rx channel is within DC 1.0V in the voltage of test point(VT).

  • Page 14: Transmitter Test

    b) Connect DC 6.0V voltage preset to EUT. c) Connect ‘Power Meter’ and ‘Dummy Load ( 50 ) d) Adjust Tx frequency according to trimming trimmer VC1. e) Connect AF Oscillator to mic terminal for conform modulation degree. f) Adjust the frequency of AF Oscillator to 1 kHz and adjust AF level Should be 100mV.

  • Page 15: Receiver Test

    b) Connection method 4 Load Power Supply Oscilloscope AV VTVM Distortion Meter SINAD Meter c) The Conform of Rx sensitivity 1) Adjust SSG to channel frequency. 2) Adjust modulation frequency , 1Khz to modulation degree, 3kHz. 3) After adjusting the frequency of SSG to channel frequency, RF level sets to –47dBm.

  • Page 16: Symptoms, Check Point & Correction

    4-6. Symptoms, Check point & 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 -. Power key is on condition but does not work. Battery could completely discharge.
  • Page 17 IF IC U8 problem. VCO circuit problem. -. Rx sensitivity is weak Antenna mounting problem. Receiver front-end circuit problem. Local oscillation frequency deviation. FL1,FL2 SAW filter fail. VCO circuit problem. -. Squelch does not work IF IC U8 problem. Control logic circuit problem. 17/21...

  • Page 18: Description Of Radio Circuit

    5. DESCRIPTION OF RADIO CIRCUIT 5-1. Frequency synthesizer Frequency synthesizerconsists of VCO, loop filter and RFIC. RFIC includes MIX,IF, Compander and PLL. Frequency synthesizer uses the PLL of thte RFIC. a) VCO VCO is composed of ONE VCO Oscillation circuit takes colpitts circuit using variable Diode. The VCO generates FRS frequencies and consists of L17, D5, C65, L19, C69, C70, R45, R44, R46, C71, C72, Q14, R47, C74, R48, Q15, L29, C147, C151.
  • Page 19 L21,C87 resonate serially and make impedance matching at receiver band- pass filter.(FL1,FL2) b) Front End Front-end has Q6 to provide a high sensitivity and low noise feature. It employs SAW filter as band pass filter to eliminate image frequency and to produce enough pass band by Q6 input and output. c) 1 Mixer The receiver which has been amplifier in the RF front-end is provided to the...

  • Page 20: Exploded View

    Max. Frequency modulation deviation is adjusted by U4,VR1 keeps noise and audio from entering to VCO at time of Tx. Audio modulation and Audio Amplification has characteristic of 6 /OCT pre-emphasis by U4. 9. EXPLODED VIEW 20/21...

  • Page 21: Channel Data

    10. CHANNEL DATA 1) FRS Frequency Chart Channel Frequency (MHz) Channel Frequency (MHz) 462.5625 467.5625 462.5875 467.5875 462.6125 467.6125 462.6375 467.6375 462.6625 467.6625 462.6875 467.6875 462.7125 467.7125 2) CTCSS Tone Frequency Chart FREQ.(Hz) FREQ. (Hz) FREQ. (Hz) 67.0 107.2 167.9 71.9 110.9 186.2...

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