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Ajetrays AR-440 [3/46] Ar 440
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A
R-440
3
■ Wide/Narrow Switching Circuit
The Wide port (pin 65) and Narrow port (pin 64) of the CPU
is used to switch between ceramic filters. When the Wide
port is high, the ceramic filter SW diodes (D303, D302) cause
CF301 to turn on to receive a Wide signal.
When the Narrow port is high, the ceramic filter SW diodes
(D303, D302) cause CF302 to turn on to receive a Narrow sig-
nal. (See Fig. 3.)
■ AF Signal System
The detection signal from IF IC (IC301) goes to D/A con-
verter (IC161) to adjust the gain and is output to AF filter
(IC251) for characterizing the signal. The AF signal output
from IC251 and the DTMF signal, BEEP signal are summed
and the resulting signal goes to the D/A converter (IC161).
The AFO output level is adjusted by the D/A converter. The
signal output from the D/A converter is input to the audio
power amplifier (IC252). The AF signal from IC252 switches
between the internal speaker and speaker jack (J1) output.
(See Fig. 4.)
■ Squelch Circuit
The detection output from the FM IF IC (IC301) passes
through a noise amplifier (Q301) to detect noise. A voltage is
applied to the CPU (IC101). The CPU controls squelch ac-
cording to the voltage (SQIN) level. The signal from the RSSI
pin of IC301 is used for S-meter. The electric field strength of
the receive signal can be known before the SQIN voltage is
input to the CPU, and the scan stop speed is improved.
Narrow
IC101 64pin
IF_IN MIX_O
IC301
IF System
CF302
(Narrow)
CF301
(Wide)
R320
R319
R317
R318
D303 D302
Wide
IC101 65pin
AF
Filter
D/A
CONV.
D/A
CONV.
IC161 IC251
IC161
W/NO
(EVOL2)
AF PA
IC252 SP
IF IC
IC301
Q301
NOISE AMP
D301IC301 IC101
AFO
RSSI
DET
CPU
IF
SYSTEM
SQIN
RSSI
Fig. 3 Wide/Narrow switching circuit
Fig. 4 AF signal system
Fig. 5 Squelch circuit
PLL Frequency Synthesizer
The PLL circuit generates the first local oscillator signal for
reception and the RF signal for transmission.
■ PLL
The frequency step of the PLL circuit is 5 or 6.25kHz. A
16.8MHz reference oscillator signal is divided at IC401 by a
fixed counter to produce the 5 or 6.25kHz reference fre-
quency. The voltage controlled oscillator (VCO) output signal
is buffer amplified by Q410, then divided in IC401 by a dual-
module programmable counter. The divided signal is com-
pared in phase with the 5 or 6.25kHz reference signal in the
phase comparator in IC401. The output signal from the
phase comparator is filtered through a low-pass filter and
passed to the VCO to control the oscillator frequency. (See
Fig. 6)
■ VCO
The operating frequency is generated by Q406 in trans-
mit mode and Q405 in receive mode. The oscillator fre-
quency is controlled by applying the VCO control voltage,
obtained from the phase comparator, to the varactor diodes
(D405 and D406 in transmit mode and D403 and D404 in
receive mode). The TX/RX pin is set high in receive mode
causing Q408 and Q407 to turn Q406 off, and turn Q405 on.
The TX/RX pin is set low in transmit mode. The outputs
from Q405 and Q406 are amplified by Q410 and sent to the
RF amplifiers. (See Fig. 6.)
D405,406
Q406
TX VCO
Q410
BUFF
AMP
D403,404
Q405
RX VCO
Q407,408
T/R SW
Charge
pump
LPF
Phase
comparator
1/M
1/N
5kHz/6.25kHz
5kHz/6.25kHz
REF
OSC
16.8MHz
PLL
DATA
IC401 : PLL IC
Q404
AMP
RF amplifiers
Q402,403
TX/RX (CPU)
Fig. 6 PLL circuit
CIRCUIT DESCRIPTION
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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