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
2
3
4
5
6
7
14
15
16
20
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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.
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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
W:
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Feature:
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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
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COMBINATION KEY FUNCTION
08
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/
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
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/
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.
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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
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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
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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)
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D. RF transceiver amplifier circuit www.intek-radios.com
1. 136 ~ 174 MHZ band transceiver
The Voice signal via MIC1 comes into the RF transceiver integrated IC
through the analog numerical transformation, digital filter ,amplification,
direct modulation,and get the 136-174Mhz RF frequency modulation signal
from the output terminal of the RF transceiver integrated IC. The signal is
amplified through the RF amplifier Q20 after the input to the RF power
amplifier driver amplifier Q28, and then via Q27 power amplifier output
to the antenna.
2. 400 ~ 470 MHZ band transceiver
The Voice signal via MIC1 comes into the RF transceiver integrated IC
through the analog numerical transformation, digital filter ,amplification
direct modulation,and get the 400-470Mhz RF frequency modulation signal
from the output terminal of the RF transceiver integrated IC. The signal is
amplified through the RF amplifier Q20 after the input to the RF power
amplifier driver amplifier Q18, and then via Q21 power amplifier output
to the antenna.
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E.audio power amplifier circuit www.intek-radios.com
Rf transceiver integrated IC will receive the RF FM through it’s internal low-
noise amplifier, direct down-conversion to low and intermediate frequency
through the amplifier and analog-digital converter into a digital signal by
the digital signal processor for digital FM demodulation. Demodulated
audio baseband signal through the audio output amplifier U5 to the speaker.
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9 pin

F FM radio integrated IC www.intek-radios.com、
FM radio signal comes into antenna, amplifies by high-frequency amplifier
Q13 input to FM radio IC, then demodulate and output the audio signal
through voice amplifier output to the speaker.
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F microprocessor and LCD display www.intek-radios.com、
With 8 bit microprocessor U1 programming, control the whole transceiver
circuit and other function modules,LCD displays related information by
it’s drive .
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6.Parts Layout www.intek-radios.com
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Side B www.intek-radios.com 
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