:
Title:
MT2020/4040D SERVICE MANUAL
Rev. Date: January 5, 2005
SPECIFICATIONS
STANDARD TEST CONDITIONS
Supply Voltage - Battery
6.0Vdc
Antenna Impedance
50 Ohm
Audio Frequency
1 KHz
Main Signal Input
1mV
Deviation PMR
AF 1 KHz / 1.5 KHz Dev
LPD
AF 1 KHz / 3.0 KHz Dev
Audio Output Power
~1.8Vrms
Audio Output Impedance
8 ohms, non-inductive
Test Temperature
25 •
GENERAL SPECIFICATIONS
Transmitter
CPU Controlled PLL Synthesizer
Receiver
CPU Controlled double conversion, super-heterodyne
system
Intermediate Frequency 1
st
21.4 MHz
2
nd
450 KHz
Operating Frequencies PMR
446.00625MHz ~ 446.09375 MHz
LPD
433.07500 MHz ~ 433.77500 MHz
Frequency Stability
0.0005%
Battery Life
30 hours (typical)
Battery
4pcs AAA size Alkaline Battery or 4.8Vdc Ni-MH Battery
Pack
Transmitter/Receiver Switching
Electrical
Ambient Conditions, Temperature / Humidity
-15
!
c ~ 55
!
C / 40% ~ 70%
RECEIVER SPECIFICATIONS
Sensitivity
<-120 @12dB SINAD
Audio Output
~2Vrms (w/o load)
Frequency Response
300 Hz ~ 2500 Hz
Image Rejection
54dB
Adjacent Channel Rejection
60dB
Inter Modulation Distortion
60dB
Conducted Rx Spurious
-54dB
TRANSMITTER SPECIFICATIONS
Output Power(Conducted) PMR Band
500Mw (MT-2020) / 1W,500mW (MT-4040D)
LPD Band
10mW
Max. Deviation PMR
"
2.5 KHz(MAX)
LPD
"
5.0 KHz(MAX)
Frequency Error
5ppm(-15~+55
!
)
Current Drain
<500 mA
Spurious Emission(Conducted)
50dB
Antenna Impedance
50 Ohm
Created by:
Approved by:
Rev. No:
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Page 3 of 49
Summary of Contents for MT-4040
Page 4: ...Model No For Stage Release Date Page 4 of 49 r BLOCK DIAGRAM Created by Approved by Rev No ...
Page 5: ...MT 2020D SCHEMATIC DIAGRAM PAGE 5 OF 49 ...
Page 6: ...MT 4040D SCHEMATIC DIAGRAM PAGE 6 OF 49 ...
Page 9: ...MT 2020D TOP PCB MAP PAGE 9 OF 49 ...
Page 10: ...MT 2020D BOTTOM PCB MAP PAGE 10 OF 49 ...
Page 11: ...MT 4040D TOP PCB MAP PAGE 11 OF 49 ...