Alinco DJ-C7T/E Service Manual
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DJ – C7 T / E Service Manual CONTENT S S SPECIFICATIONS General…..……………………………..…….…… Transmitter…….……………………..…………… Receiver….………………………………..……… CIRCUIT DISCRIPTION 1) Receiver System……….………………………. 2) Transmitter System…………………………….. 3) M38268MCL069GP (XA1023)……..………… SEMICONDUCTOR DATA 1) NJM2070M (XA0210)………………………… 2) TC4W53FU (XA0348) ……………………….. 3) XC62HR3302MR (XA0519)..………………… 4) BA4510FV (XA0537)…..…………………….. 5) NJM2904V (XA0573)…..…………………….. 6) TK10931V...
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2 SPECIFICATIONS General Type DJ – C7T DJ-C7E VHF 144.000 – 147.995MHz 144.000 – 145.995MHz Transmitter Range UHF 420.000 – 449.995MHz 430.000 – 439.995MHz WFM 88.100 – 1.7.995MHz 87.500 – 107.995MHz VHF 108.000 – 173.995MHz 144.000 – 145.995MHz Receiving Range UHF 380.000 – 511.995MHz 430.000 – 439.995MHz Modulation F3E Operating temperature -10 °C ~ 60°C (+14°F ~ +140°F) Frequency stability -7 ~ +3 ppm Antenna impedance 50ohm unbalanced (SMA) Supply Voltage 3.7 –...
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CIRCUIT DESCRIPTION
1) Reception
1. RX Method
[FM/AM]
Double Super Heterodyne Method
1st IF: 50.85MHz
2nd IF: 450kHz
[WFM]
Single Super Heterodyne Method
1st IF: 10.7MHz
2. Front End
[WFM BAND]
The signal input from antenna passes through the low pass filter, and then it is
amplified at RF amplifier Q13. The amplified signal is led to band pass filter
and band switch D17, then input to the mixer IC3.
[VHF BAND]
The signal input from antenna passes through the low...](http://img.usermanuals.tech/thumb/5670/81908/w300_alinco_dj-c7-vhf-uhf-porto_service-manual_d-2.png "Page 3
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CIRCUIT DESCRIPTION
1) Reception
1. RX Method
[FM/AM]
Double Super Heterodyne Method
1st IF: 50.85MHz
2nd IF: 450kHz
[WFM]
Single Super Heterodyne Method
1st IF: 10.7MHz
2. Front End
[WFM BAND]
The signal input from antenna passes through the low pass filter, and then it is
amplified at RF amplifier Q13. The amplified signal is led to band pass filter
and band switch D17, then input to the mixer IC3.
[VHF BAND]
The signal input from antenna passes through the low...")
3 CIRCUIT DESCRIPTION 1) Reception 1. RX Method [FM/AM] Double Super Heterodyne Method 1st IF: 50.85MHz 2nd IF: 450kHz [WFM] Single Super Heterodyne Method 1st IF: 10.7MHz 2. Front End [WFM BAND] The signal input from antenna passes through the low pass filter, and then it is amplified at RF amplifier Q13. The amplified signal is led to band pass filter and band switch D17, then input to the mixer IC3. [VHF BAND] The signal input from antenna passes through the low...
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4. IF
[FM/AM]
The signal amplified at the 1st IF amplifier Q15 is supplied to pin 24 of IC7
for demodulation. Also the signal of 12.6 MHz from the reference buffer
output of IC2 is multiplied by 3 at Q12, and then it is led to pin 1 of IC7. 2
input signals are mixed in the mixer circuit inside IC7 and converted into the
2nd IF signal of 450kHz.The converted 2nd IF signal is output from pin 3 of
IC7.
[FM]
The output signal from pin 3 of IC7 is led to pin 7 of IC7 after eliminating the...](http://img.usermanuals.tech/thumb/5670/81908/w300_alinco_dj-c7-vhf-uhf-porto_service-manual_d-3.png "Page 4
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4. IF
[FM/AM]
The signal amplified at the 1st IF amplifier Q15 is supplied to pin 24 of IC7
for demodulation. Also the signal of 12.6 MHz from the reference buffer
output of IC2 is multiplied by 3 at Q12, and then it is led to pin 1 of IC7. 2
input signals are mixed in the mixer circuit inside IC7 and converted into the
2nd IF signal of 450kHz.The converted 2nd IF signal is output from pin 3 of
IC7.
[FM]
The output signal from pin 3 of IC7 is led to pin 7 of IC7 after eliminating the...")
4 4. IF [FM/AM] The signal amplified at the 1st IF amplifier Q15 is supplied to pin 24 of IC7 for demodulation. Also the signal of 12.6 MHz from the reference buffer output of IC2 is multiplied by 3 at Q12, and then it is led to pin 1 of IC7. 2 input signals are mixed in the mixer circuit inside IC7 and converted into the 2nd IF signal of 450kHz.The converted 2nd IF signal is output from pin 3 of IC7. [FM] The output signal from pin 3 of IC7 is led to pin 7 of IC7 after eliminating the...
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7. VCO
[VHF]
VCO in VHF band consists of the Colpitts oscillator. D3, D4 and L11
determine the oscillating frequency, and the signal is oscillated at the
transistor Q2. The oscillated signal is supplied to pin 8 of PLL-IC2 passing
through the buffer amplifier Q5 and Q4.
[UHF]
VCO in UHF band consists of the Colpitts oscillator. D9, D11 and L18
determine the oscillating frequency, and the signal is oscillated at the
transistor Q7. The oscillated signal is supplied to pin 8 of PLL-IC2...](http://img.usermanuals.tech/thumb/5670/81908/w300_alinco_dj-c7-vhf-uhf-porto_service-manual_d-4.png "Page 5
5
7. VCO
[VHF]
VCO in VHF band consists of the Colpitts oscillator. D3, D4 and L11
determine the oscillating frequency, and the signal is oscillated at the
transistor Q2. The oscillated signal is supplied to pin 8 of PLL-IC2 passing
through the buffer amplifier Q5 and Q4.
[UHF]
VCO in UHF band consists of the Colpitts oscillator. D9, D11 and L18
determine the oscillating frequency, and the signal is oscillated at the
transistor Q7. The oscillated signal is supplied to pin 8 of PLL-IC2...")
5 7. VCO [VHF] VCO in VHF band consists of the Colpitts oscillator. D3, D4 and L11 determine the oscillating frequency, and the signal is oscillated at the transistor Q2. The oscillated signal is supplied to pin 8 of PLL-IC2 passing through the buffer amplifier Q5 and Q4. [UHF] VCO in UHF band consists of the Colpitts oscillator. D9, D11 and L18 determine the oscillating frequency, and the signal is oscillated at the transistor Q7. The oscillated signal is supplied to pin 8 of PLL-IC2...
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2) Transmitter
1. Microphone Amplifier
The microphone amplifier IC301 has 2 operational amplifiers. The voice is
converted into the electric signal through the microphone, and then supplied
to IC301. The input signal is amplified and pre-emphasized to be output.
[VHF]
The signal output from microphone amplifier is adjusted the maximum
frequency deviation at VR2. The adjusted signal is added to the cathode of
VCO variable-capacitor D4 for deviation to change the capacity of the...](http://img.usermanuals.tech/thumb/5670/81908/w300_alinco_dj-c7-vhf-uhf-porto_service-manual_d-5.png "Page 6
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2) Transmitter
1. Microphone Amplifier
The microphone amplifier IC301 has 2 operational amplifiers. The voice is
converted into the electric signal through the microphone, and then supplied
to IC301. The input signal is amplified and pre-emphasized to be output.
[VHF]
The signal output from microphone amplifier is adjusted the maximum
frequency deviation at VR2. The adjusted signal is added to the cathode of
VCO variable-capacitor D4 for deviation to change the capacity of the...")
6 2) Transmitter 1. Microphone Amplifier The microphone amplifier IC301 has 2 operational amplifiers. The voice is converted into the electric signal through the microphone, and then supplied to IC301. The input signal is amplified and pre-emphasized to be output. [VHF] The signal output from microphone amplifier is adjusted the maximum frequency deviation at VR2. The adjusted signal is added to the cathode of VCO variable-capacitor D4 for deviation to change the capacity of the...
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3) M38268MCL069GP (XA1023)
CPU
Terminal Connection
(TOP VIEW)
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8 No. Terminal Signal I/O Description 1 P67/AN7 BP1 I Band plan 1 2 P66/AN6 BCHK I Battery detection input 3 P65/AN5 PCNT 0 Battery detection SW output 4 P64/AN4 SMT I S-meter input 5 P63/SCLK22/AN3 SQL I Noise level input for squelch 6 P62/SCLK21/AN2 TIN I CTCSS Tone input 7 P61/SOUT2/AN1 TLC O TX LED SW output 8 P60/SIN2/AN0 BAT I Battery charge voltage input 9 P57/ADT/DA2 TUNC/TONE O RX Tuning/Tone out 10 P56/DA1 PO O Power control output 11 P55/CNTR1...
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9 No. Terminal Signal I/O Description 51 P13/SEG37 W/NC O Wide / Narrow SW output 52 P12/SEG36 FMC O FM SW output 53 P11/SEG35 T3C O T3V power ON/OFF SW output 54 P10/SEG34 TSWC O Tone power ON/OFF SW output 55 P07/SEG33 TUC O UHF-TX power ON/OFF SW output 56 P06/SEG32 TVC O VHF-power ON/OFF SW output 57 P05/SEG31 BD3C O BND3 power SW output 58 P04/SEG30 BD4C O BND4 power SW output 59 P03/SEG29 AMC O AM SW output 60 P02/SEG28 AFC O AF SW output...
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