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Ajetrays AR-440 [2/46] Ar 440
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AR-440
2
Frequency Configuration
The receiver utilizes double conversion. The first IF is
49.95MHz and the second IF is 450kHz. The first local oscil-
lator signal is supplied from the PLL circuit.
The PLL circuit in the transmitter generates the necessary
frequencies. Figure 1 shows the frequencies.
CIRCUIT DESCRIPTION
Receiver System
The receiver is double conversion superheterodyne. The
frequency configuration is shown in Figure 1.
■ Front-end RF Amplifier
An incoming signal from the antenna is applied to an RF
amplifier (Q353) after passing through a transmit/receive
switch circuit (D603, D604 and D605 are off) and a BPF
(L359, L358 L360, L361 and varactor diodes : D353, D354,
D355). After the signal is amplified (Q353), the signal is fil-
tered by a BPF (L354, L355 and varactor diodes: D351, D352)
to eliminate unwanted signals before it is passed to the first
mixer.
The voltage of these diodes are controlled by tracking the
CPU (IC101) center frequency of the band pass filter. (See
Fig. 2.)
■ First Mixer
The signal from the RF amplifier is heterodyned with the
first local oscillator signal from the PLL frequency synthesizer
circuit at the first mixer (Q352) to create a 49.95MHz first
intermediate frequency (1st IF) signal. The first IF signal is
then fed through one pair of monolithic crystal filter (MCF :
XF351) to further remove spurious signals.
ANT
SW
RF
AMP
1st
MIX
AF
PA
TCXO
MIC
AMP
X3
multiply
RF
AMP
POWER
AMP
CF 450kHz
MCF
49.95MHz
IF SYSTEM
PLL/VCO
16.8MHz
50.4MHz
ANT
RX
TX
SP
MIC
Fig. 1 Frequency configuration
■ IF Amplifier
The first IF signal is amplified by Q351, and then goes to
IC301 (FM processing IC). The signal is heterodyned again
with a second local oscillator signal within IC301 to create a
450kHz second IF signal. The second IF signal is then fed
through a 450kHz ceramic filter (Wide : CF301, Narrow :
CF302) to further eliminate unwanted signals before it is am-
plified and FM detected in IC301.
Item Rating
Nominal center frequency 49.95MHz
Pass bandwidth ±5.0kHz or more at 3dB
35dB stop bandwidth ±20.0kHz or less
Ripple 1.0dB or less
Insertion loss 5.0dB or less
Guaranteed attenuation 80dB or more at fo±1MHz
Spurious 40dB or more
Terminal impedance 350Ω / 5.5pF
Table 1 Crystal filter (L71-0620-05) : XF351
Item Rating
Nominal center frequency 450kHz
6dB bandwidth ±6.0kHz or more
50dB bandwidth ±12.5kHz or less
Ripple 2.0dB or less
Insertion loss 6.0dB or less
Guaranteed attenuation 35.0dB or more within fo±100kHz
Terminal impedance 2.0kΩ
Table 2 Ceramic filter (L72-0993-05) : CF301
Item Rating
Nominal center frequency 450kHz
6dB bandwidth ±4.5kHz or more
50dB bandwidth ±10.0kHz or less
Ripple 2.0dB or less
Insertion loss 6.0dB or less
Guaranteed attenuation 60.0dB or more within fo±100kHz
Terminal impedance 2.0kΩ
Table 3 Ceramic filter (L72-0999-05) : CF302
ANT
L358~361
D353~355
BPF
Q353
RF AMP
Q351
IF AMP
IC161
D/A CONVERTER
Q352
MIX
XF351
MCF
D601~
D604
ANT
SW
IC203
DC AMP
IC161
D/A
Q302
X3 multiply
X401
TCXO
IC301
IF system
1st local
OSC (VCO/PLL)
W/NO
(EVOL2)
CF301 (Wide)
CF302 (Narrow)
TV
CPU
L354,355
D351,352
BPF
Fig. 2 Receiver system
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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