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Ajetrays AR-440 [6/46] Ar 440
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A
R-440
6
■ Decode
• CTCSS/DCS
The signal (W/NO (EVOL2)) goes to DTMF IN (pin 95) of
CPU (IC101). The CTCSS/DCS signal will pass through the
low-pass filters in the CPU (IC101) and be decoded within the
CPU (IC101). The DTMF signal will be decoded within the
CPU (IC101).
■ D/A Converter
The D/A converter (IC161) is used to adjust MO modula-
tion, AF volume, TV voltage, FC reference voltage, and PC
POWER CONTROL voltage level.
Adjustment values are sent from the CPU as serial data.
The D/A converter has a resolution of 256 and the following
relationship is valid:
D/A output = (Vin – VDAref) / 256 x n + VDAref
Vin: Analog input
VDAref: D/A reference voltage
n: Serial data value from the microprocessor (CPU)
Power Supply Circuit
When the power switch on the display unit is pressed, the
power port on the display unit which is connected port 17
(POWER), goes low, then port 82 (SBC) goes high, Q32 turns
on, SB SW (Q31) turns on and power (SB) is supplied to the
radio.
When the DC power supplied to the radio, the voltage
regulator IC (IC33) supply into the CPU VDD and reset voltage
detect IC (IC34). IC34 will generate signal (RESET) in to the
reset terminal on the CPU (IC101) to carry out a power ON
reset. If DC power is less than about 9.5V, the radio is unable
to power on.
When the DC power voltage deceases from normal volt-
age, the INT voltage detector IC (IC35) will set to high on CPU
port 18 (INT) if B line will became less than about 9.5V. Then
CPU send to EEPROM (IC66) the backup data and go into
STOP mode.
This circuit has an overvoltage protection circuit. If a DC
voltage of 18V or higher is applied to the base of Q61, this
voltage turns Q61 on and will set to high on CPU port 18
(INT). Then CPU send to EEPROM (IC66) the backup data
and go into stop mode. (See Fig. 16.)
IC101
CPU
DTMF IN
W/NO (EVOL2)
95
Q71
SW
Q31
SW
Q32
SW
Q61
SW
IC33
AVR
D61D62
B
IC34
RST
SBC
IGN
R77R76
R39R40
INT
5M
BATT
IC101
CPU
POWER
SW
POWER
RESET
5M
IC35
INT
SB
IGN
Fig. 15 Decode
Fig. 16 Power supply circuit
CIRCUIT DESCRIPTION
Data Terminal and Peripheral Circuits
CN2 (data terminal) is the data communications terminal
on the TX/RX PCB. It handles transmission control, data in-
put/output, and squelch signals.
There are two data communications modes : 9600bps
mode and 1200bps mode. Unlike with 1200bps AFSK, with
this type of high-speed modulation, frequency modulation is
carried out after the digital base band signals (rectangular
wave) are passed through a band limiting filter. For 9600bps
GMSK for example, compared to 4800Hz signals (nearly sine
wave signals passed through a filter), these signals have a
hissing sound like digital modulation when listened to by ear.
Different types of modulation, such as GMSK is distin-
guished by the type of band limiting filter.
Pin Pin Specification
No. Name
1 PKD bps switching 1200bps 9600bps
Modulation input 400mVp-p 4Vp-p
Frequency shift 3±0.5kHz 2.2± 0.5kHz
4 PR9 Output level 500mVp-p/10kΩ
Always output during reception
5 PR1 Output level 500mVp-p/10kΩ
Not output when squelch off
Table 4 Data terminal input/output level
Содержание
- Ar 440 1
- Contents 1
- Cover contents 1
- Service manual 1
- Uhf fm transceiver 1
- Ar 440 2
- Circuit description 2
- Fig 1 frequency configuration 2
- Fig 2 receiver system 2
- First mixer 2
- Frequency configuration 2
- Front end rf amplifier 2
- If amplifier 2
- Receiver system 2
- Table 1 crystal filter l71 0620 05 xf351 2
- Table 2 ceramic filter l72 0993 05 cf301 2
- Table 3 ceramic filter l72 0999 05 cf302 2
- Af signal system 3
- Ar 440 3
- Circuit description 3
- Fig 3 wide narrow switching circuit 3
- Fig 4 af signal system 3
- Fig 5 squelch circuit 3
- Fig 6 pll circuit 3
- Pll frequency synthesizer 3
- Squelch circuit 3
- Wide narrow switching circuit 3
- Apc circuit 4
- Ar 440 4
- Circuit description 4
- Fig 7 unlock circuit 4
- Fig 8 transmitter system 4
- Fig 9 apc circuit 4
- Outline 4
- Power amplifier circuit 4
- Transmitter system 4
- Unlock circuit 4
- Ar 440 5
- Circuit description 5
- Control circuit 5
- Display circuit 5
- Encode 5
- Fig 10 control circuit 5
- Fig 11 memory circuit 5
- Fig 12 display circuit 5
- Fig 13 key matrix circuit 5
- Fig 14 encoder 5
- Key matrix circuit 5
- Memory circuit 5
- Ar 440 6
- Circuit description 6
- D a converter 6
- Data terminal and peripheral circuits 6
- Decode ctcss dcs 6
- Fig 15 decode 6
- Fig 16 power supply circuit 6
- Power supply circuit 6
- Table 4 data terminal input output level 6
- Ar 440 7
- Circuit description 7
- Fog 17 data terminal and peripheral circuits 7
- Pr1 is the 1200bps data communications reception out put it outputs the fm detection circuit output through an af filter ic251 output is controlled with the mute switch q252 according to whether squelch is open or closed see fig 17 7
- Pr9 is the 9600bps data communications reception out put it outputs the fm detection circuit output through an af filter ic251 these signals are always output whether the squelch is open or closed 7
- Reception signals 7
- Squelch signal output circuit 7
- The squelch circuits is input to the tnc to prevents con flicts from occurring between simultaneous receive mode and transmit mode traffic during packet communications only during 1200bps the signal is output from pin 29 of ic101 to the data terminal the logic is as shown in the table below 7
- Transmission modulation signals enter from pkd of the data terminal cn2 the path to the modulation depends on whether communications are 1200bps or 9600bps mode for 1200bps mode the transmission modulation signals from single analog switch ic204 pass through mic amplifier ic201 202 and summing amplifier ic203 and go to vco x401 through d a converter ic161 for 9600bps mode the transmission modulation signals from single analog switch ic205 pass through summing amplifier ic303 go to tcxo x401 and vco through d a converter ic161 see fig 17 7
- Transmission signals 7
- Ar 440 8
- Microprocessor 30622maa b85gp tx rx unit ic101 8
- Semiconductor data 8
- Terminal function 8
- Ar 440 9
- Components description 9
- Display unit x54 3450 10 9
- Tx rx unit x57 6863 xx 9
- Ar 440 10
- Display unit x54 3450 10 10
- Parts list 10
- Tm 471a 10
- Tx rx unit x57 686x xx 10
- Tx rx unit x57 686x xx 3 00 c 3 01 c2 10
- Ar 440 11
- Parts list 11
- Ar 440 12
- Parts list 12
- Ar 440 13
- Parts list 13
- Ar 440 14
- Parts list 14
- Ar 440 15
- Parts list 15
- Ar 440 16
- Parts list 16
- Ar 440 17
- Exploded view 17
- Ar 440 18
- Packing 18
- Parts with the exploded numbers larger than 700 are not supplied 18
- Ar 440 19
- Full reset 19
- Full reset method 1 19
- Full reset method 2 19
- Initial settings 19
- Resetting the tansceiver 19
- Resetting the transceiver 19
- Vfo reset 19
- Vfo reset method 1 19
- Vfo reset method 2 19
- Adjustment 20
- Adjustment mode 20
- Ar 440 20
- Adjustment 21
- Ar 440 21
- Table 1 adjustment items display and test frequency list 21
- Adjustment 22
- Ar 440 22
- Mic connector front view 22
- Test cable for microphone input e30 3360 08 22
- Test equipment required for alignment 22
- Tuning cable e30 3383 05 22
- Adjustment 23
- Adjustment location 23
- Adjustment points 23
- Af pa ic ic252 23
- Ar 440 23
- Notes eeprom 23
- Speaker cable 23
- Tc402 l301 23
- Tx rx unit foil side 23
- Adjustment 24
- Adjustment of tx vco lock voltage 24
- Ar 440 24
- Pcb section 24
- Transmitter section 24
- Adjustment 25
- Ar 440 25
- If normal power is not obtained please follow the step below 25
- Receiver section 25
- Adjustment 26
- Ar 440 26
- Ar 440 27
- Dislay unit x54 3450 10 27
- Terminal function 27
- Tx rx unit x57 686x xx 27
- Display unit x54 3450 10 28
- Display unit x54 3450 10 component side view j72 0905 09 28
- Display unit x54 3450 10 foil side view j72 0905 09 28
- Pc board 28
- Ar 440 29
- Display unit x54 3450 10 component side view j72 0905 09 29
- Display unit x54 3450 10 foil side view j72 0905 09 29
- Pc board 29
- Complete view 30
- Display unit x54 3450 10 component side view j72 0905 09 30
- Display unit x54 3450 10 foil side view j72 0905 09 display unit x54 3450 10 foil side view j72 0905 09 30
- Pc board 30
- Component side view 1 2 31
- Pc board 31
- Tx rx unit x57 686x xx 31
- Tx rx unit x57 686x xx 3 00 c 3 01 c2 component side view j72 0907 09 31
- Ar 440 32
- Component side view 2 2 32
- Pc board 32
- Tx rx unit x57 686x xx 3 00 c 3 01 c2 component side view j72 0907 09 32
- Ar 440 33
- Component side view complete view 33
- Pc board 33
- Tx rx unit x57 686x xx 3 00 c 3 01 c2 component side view j72 0907 09 tx rx unit x57 686x xx 3 00 c 3 01 c2 component side view j72 0907 09 33
- Foil side view 1 2 34
- Pc board 34
- Tx rx unit x57 686x xx 3 00 c 3 01 c2 foil side view j72 0907 09 34
- 00 c 3 01 c2 35
- Ar 440 35
- Foil side view 2 2 35
- Foil side view j72 0907 09 35
- Pc board 35
- Tx rx unit x57 686x xx 35
- 00 c 3 01 c2 36
- Ar 440 36
- Foil side view complete view 36
- Foil side view j72 0907 09 36
- Pc board pc board 36
- Tx rx unit x57 686x xx 36
- Tx rx unit x57 686x xx 3 00 c 3 01 c2 foil side view j72 0907 09 36
- Schematic diagram 37
- Tx rx unit x57 686x xx 37
- Ar 440 38
- Schematic diagram 38
- Schematic diagram 39
- Ar 440 40
- Display unit x54 3450 10 40
- Note the components marked with a dot are parts of layer 1 40
- Schematic diagram 40
- T s r q p 40
- Ar 440 41
- Complete view 41
- Display unit x54 3450 10 41
- Schematic diagram 41
- Tx rx unit x57 6863 xx 41
- Ar 440 42
- Block diagram 42
- Display unit x54 3450 10 42
- Tx rx unit x57 686x xx 42
- Ar 440 43
- Block diagram 43
- Ar 440 44
- Level diagram 44
- Receiver section 44
- Transmitter section 44
- Ar 440 45
- Level diagram 45
- Ajetrays corporation 46
- Ar 440 46
- Specifications 46
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