Intek KT-950EE User manual

Service Manual

www.intek-radios.com

INTEK Model:KT-950EE

------------------ --------------------CONTENTS

INTRODUCTION

ELECTRICAL FEATURES

FEATURE

LCD DISPLAY

KEY FUNCTION

CIRCUIT DESCRIPTION

BLOCK DIAGRAM

PART LIST

CIRCUIT DIAGRAM

PARTS LAYOUT

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Scope of this manual

Safety:

This manual is intended for use by experienced technicians familiar with similar

types of commercial grade communications equipment. It contains all required

service information the equipment and is current as of the publication date. This

manual almost correct and complete, if there is something oversight, company

keeps the right of explanation. And we also keep the right of change the design

and the specification.

Do not transmit, if you don’t check all transmitting pins or one of the opening

pins hasn’t connect to the correspond port.

Switch off power when you are on flammability gas condition.

Do not take it apart, or have it repaired by a nonprofessional.

Turn off the radio before of detonator and blasting area.

In order to avoid the problem arising by Electromagnetic interference and/or

Electromagnetic Compatibility, please turn off the radio where there has a

mark: Turn off radio, such as hospital or other health care place and enplane.

www.intek-radios.com

▣

Personal

Introduction

-2-

Electrical Features

1-1 STANDARD TEST CONDITIONS

Supply

●Voltage 3 7.VDC

●Antenna Impedance 50 Ohm

●Audio Frequency 1 KHz

●Main Signal Input ‐47 dBm

●Deviation 3Khz /N: 1.5KHz

●Reference Audio Output Power 1 5.Vrms at external Speaker

●Audio Output Impedance 8ohms non,‐inductive

●Te s t Te m p e r a t u r e +25℃

●Channel Space N-Band : 12 5KHz./ W‐Band : 25KHz

1-2 GENERAL SPECIFICATIONS

●Frequencies VHF:136 MHz ～174 MHz

UHF:400 MHz ～470 MHz

●Number of Channel 99 Channels programmable

●Temperature Range ‐ 20 c ~+60 C

●Current Drain 30mA on Standby / 70mA on Receive / 1200mA on Transmit

●Transmitter Receiver/Switching Electrical

1-3 RECEIVER SPECIFICATIONS

●Sensitivity (12dBSINAD)W:‐122dBm / N : ‐120dBm

●Audio Output 0 5.W at 8 Ω less than 5%distortion

●Spurious & Image Rejection 60 dB

●Adjacent Channel Rejection W : 65 dB / N : 65 dB

●Inter Modulation Distortion 65 dB

●Hum & Noise W:45dB / N : 40 dB

1-4 TRANSMITTER SPECIFICATIONS

●Output Power(Conducted)2W

●Peak Deviation W:5KHz/N:?.5KHz

●Frequency Error 0 0003.%at ‐20 C to +60 C

●Audio Distortion 3%at 1 KHz

●Spurious & Harmonics 60 dBc

●Hum & Noise W : 52dB / N : 50dB

-3-

Feature:

●

Dual Band Dual Frequency

2 Watts Output Power

99+1 Memory Channels

High/low Power Switchable

25khz/12.5khz Switchable

Channel Steps (5k/6.25k/10k/12.5k/25k)

KeyPad Operation

CTCSS / CDCSS

Programmable In Separate Channels

Come With 1200mah Li-ion Battery

Vox Built In

Frequency Scan & CTCSS Scan

Three Different Scan Type:TO/CO

Sound Alarm

Progrmmable By PC Software

Priority Scan Function

Switching Between Channel Mode /VFO Mode

Display Channel + Frequency Mode

Adjust Squelch Level(0-9)

Busy Channel Lockout

Keypad Lock

Scan Channel Delete

Low Battery Alert

Battery Saver

Time-out Timer

136-174mhz&400-470mhz

●

-www.intek-radios.com -4-

www.intek-radios.com -5-

COMBINATION KEY FUNCTION

Menu Item Description Settings

RXCODE OFF CTCSS CS',D

TXCODE OFF CTCSS CS',D

SQL ()Squelch 09---

LIGHT ()LICD llumination OFF ON EY//K

BEEP Keypad eeper()BOFF N--O

VOX OFF 1 9/ ---

POWER F utput ower()RO P HIGH LOW/

DW Dual(Watch UHF HF/&)V

STEP

OFFSET

SHIFT

STE

WN/

SAVE

TOT

SCANM

RELAYM

BCLO

ON OFF/

5 6 25 10 12 5 20 25KHz/.//.//

0 37 995 0 69 995MHz-. /-.

0/-/+

ON OFF/

WIDTH NARROW/

ON OFF/

OFF 30 60 90 120 180S//// /

TO CO/

ON OFF/

[]DIAL ：Tuning knob,used to set the operating frequency, menu function selection

and other adjustments.

[]PTT ：Launch key,the launch press the switch,and after launch loosen.

[/]MON VOL ：Hold down is to monitor function,and press the Volume and Dial

switch is the key 。

[]POWER ：On off/,press and hold the key for two seconds boot or turn off.

[/ ]F Alert ：According to activate the second function for short (Fkey); Long press for

alarm (emergency call functions).

[MODE]：

：Function keys:short push down this button into functional Settings menu ；

Long press for the keyboard locked LCD display iconRepeat this step for to

unlock.（ Note:the keyboard locked,function keys 、confirmed after the key 、

the radio button 、stepping switch operation is invalid.）.

[/ ]VM：Short for all frequency mode according to the UHF and VHF switch function ；

Long press for all frequency mode and channel mode switch function.

[/]LAMP FM ：According to the flashlight switch for short;Long press for the radio

function.

F MODE+[ ] ：

：Scanning function.

FVM+[ / ]：

：All frequency mode memory function.

F DIAL+[ ]: +‐1Mhz ;

[/]+MON VOL []DIAL ：Adjust the volume.

www.intek-radios.com -6-

Circuit Description

The KT-950EE contains power control circuit,RF transceiver integrated IC,

RF receiver amplifier circuit, RF transceiver amplifier circuit, audio

power amplifier circuit, FM radio integrated IC, microprocessor and LCD

display.

A. power control circuit

1.With 3.7 V working voltage and 1200 mAH lithium battery.

2.D1070, D1075 U6, Q1073, U9, U10 and the surrounding circuit constitute

the battery voltage circuit and 3V power supply circuit.

3.Q14, Q16, Q9, Q26, Q11 Q12 constitute a power supply switch circuit.

Q14 which provides receiver power VRX when 28 pin of the chip Rf001

is in low potential Q14 will make a conduction; And Q16 provides

transceiver power VTX when 27 pin of the chip RF001 is in low

potential Q16 will make a conduction www.intek-radios.com

Chart 1 Power Control circuit

-7-

Q9 Q26 Q11 Q12 constitute a separate V U band transceiver power

and receiver power Q9 Q11 control VHF VRX VHF VTX power when

30 pin of the chip RF001 is in high potential both of Q9 Q11 will

make the conduction;And Q26 Q12 control UHF VRX UHF VTX

power when 29 pin of the chip RF001 is in high potential both of

Q26 Q12 will make the conduction

,, - 、 - ,

-,,

,-,-

,- ,

-8-

27 Pin

28 Pin

29 Pin

30 Pin

B. RF transceiver integrated IC www.intek-radios.com

RF transceiver integrated IC is a half-duplex FM radio transceiver,it can

work in 136 ~ 174 MHZ, 400 ~ 470 MHZ. The transceiver integrates the high

performance PLL,ADC/DAC,and with the advanced digital signal

processing ability. This IC integrates all the radio’s RF transceiver

channel circuit,which only require very little peripheral devices to

complete RF transceiver function.

C. RF receiver amplifier circuit:

1. 136 ~ 174 MHZ band receiver

The high frequency signals between 136 to 174 MHZ comes from the

antenna through a low-pass filter circuit, VHF T/R switch circuit to radio

frequency amplifier circuit Q15 amplification, the signal comes into the

RF transceiver integrated IC. (RF01)

2. 400 ~ 470 MHZ band receiver

The high frequency signals between 400 to 470 MHZ comes from the

antenna through a low-pass filter circuit, UHF T/R switch circuit to radio

frequency amplifier circuit Q7 amplification, the signal comes into the

RF transceiver integrated IC.(RF01)

-9-

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