BLOCK DIA GRAM...................................................... 33
ALINCO,INC.
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SPECIFICATIONS
1) GENERAL
Receiving rangeE: 0.1 ~ 1299.995 MHz
T: 0.1 ~ 823.995 MHz
850.000 ~ 868.995 MHz
895.000 ~ 1299.995 MHz
Modulation modeFM, WFM, AM
Ant. impedance50Ω
Ant. ter minalSMA
Supply voltageDC 3.6V ~ 6V (Internal battery)
DC 4.5V ~ 16V (external regulated source)
GroundNegative ground
Current consumptionreception : approx.75mA
Battery save (1:4)approx.39mA
Temperature range-10 ~ +60°C (+14 ~ +140 F°)
Frequency stability±5ppm(-10 ~ +60°C)(+14 ~ +140F°)
Dimension56(W) × 102(H) × 23(D)mm
WeightApprox.145g
2) RECEIVER
SystemTriple-conversion superheterodyne
First IF248.45 MHz
Second IF38.85 MHz
Third IF450 kHz
SelectivityAM/FM -6dB/12kHz or over , -60dB/30kHz or less
WFM-6dB/150kHz or over
SensitivityFM/WFM 12dB SINAD, AM 10dB S/N
Typ.AM: 0.5 ~ 1.62MHz17dBu 10dB S/N
1.625MHz or over5dBu10dB S/N
FM: 30 ~ 550MHz-3dBu12dB SINAD
550MHz or over0dBu12dB SINAD
WFM: 76 ~ 770MHz13dBu12dB SINAD
Audio output power more than 220mW (8Ω)
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CIRCUIT DESCRIPTION
1) Receiver
1. RX Method: Triple Super Heterodyne Method
1st IF.:248.45MHz
2nd IF.:38.85MHz
3rd IF.:450KHz
2. Front End
0.1 ~ 29.995MHz
The signal input from antenna is switched at band s witch D19, passing through
the low pass filter , it is amplified at RF amplifier Q15. Then the signal is added
to the 1st mixer IC3 through the band s witch D17.
30 ~ 136.995MHz
The signal input from antenna is switched at band s witch D23, passing through
the band pass filter, it is amplified at RF amplifier Q21. Then the signal is added
to the 1st mixer IC3 through the band s witch D22.
137 ~ 222.995MHz
The signal input from antenna is switched at band s witch D27, passing through
the band pass filter, it is amplified at RF amplifier Q23. Then the signal is added
to the 1st mixer IC3 through the band s witch D26.
223 ~ 367.995MHz
368 ~ 469.995MHz
470 ~ 129.995 MHz
3. Mixer
The 1st Mixer
The signal input from antenna is switched at band s witch D29, passing through
the band pass filter, it is amplified at RF amplifier Q27. Then the signal is added
to the 1st mixer IC3 through the band s witch D28.
The signal input from antenna is switched at band s witch D32, passing through
the band pass filter, it is amplified at RF amplifier Q32. Then the signal is added
to the 1st mixer IC3 through the band s witch D31.
The signal input from antenna is switched at band switch D37 and D45,
passing through the band pass filter , it is amplified at RF amplifier Q38. Then
the signal is added to the 1st mixer IC3 through the band s witch D36.
The input signal and the 1st local signal is added or subtracted at mixer IC3,
and SAW filter FL1 selects the signal of 248.45 MHz, then eliminates the
adjacent signal.
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The 2nd Mixer
FM/AM
WFM
4. IF
FM/AM
The input signal and the 2nd local signal is added or subtracted at mixer IC4,
and switched to FM/AM receiving side or WFM receiving side at D24 or D25 .
At FM/AM receiving side, the crystal filter XF1 selects the signal of 38.85 MHz.
The signal is amplified at the 1st IF amplifier Q22 after the adjacent signal is
eliminated.
At WFM receiving side, the band pass filter selects the signal of 38.85 MHz.
The signal is amplified at the 1st IF amplifier Q22 after the adjacent signal is
eliminated.
The amplified signal at the 1st IF amplifier Q22 is supplied to pin 24 of IC6 for
demodulation. The signal of 12.8 MHz from the IC 1 reference buffer output is
multiplied by 3 at Q17, then mix ed with the signal added to pin 1 of IC6 in the
mixer circuit inside IC6 to be con verted into the 2nd IF signal of 450 kHz. The
converted 2nd IF signal is output from pin 3 of IC6.
FM
AM
WFM
5. Squelch
The output signal from pin 3 of IC6 is input to pin 7 of IC6 after the adjacent
signal is eliminated at the ceramic filter FL2. The 2nd IF signal input to pin 7 of
IC6 is demodulated at the limiter amplifier and quadrature detection circuit
inside IC. Then the signal is output from pin 12 of IC6 as an AF signall.
The output signal from pin 3 of IC6 is input to pin 5 of IC6 after the adjacent
signal is eliminated at the ceramic filter FL2. The 2nd IF signal input to pin 5 of
IC6 is output from pin 13 of IC6 as an AF signal after AM is detected inside IC.
Also reverse AGC is added to the 1st IF amplifier Q22 by AGC amplifier Q25
and the gain is controlled to get the normal audio output even though the input
signal is fluctuated.
The output signal from pin 3 of IC6 is input to pin 7 of IC6. The 2nd IF signal
input to pin 7 of IC6 is demodulated at the limiter amplifier and quadrature
detection circuit inside IC, and output from pin 12 of IC6 as an AF signal.
The AF signal is output from pin 12 of IC6 and input to pin 19 of IC6. The
input signal is output from pin 21 of IC6 through the noise filter amplifier
and rectifying circuit. The rectified signal is supplied to the A/D por t of
microcomputer IC1. Then the microcomputer IC1 judges the signal to
control ON/OFF of audio output.
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6. Audio
FM/AM/WFM
7. VCO
The 1st Local
The audio output signal for receiving FM/WFM and AM is s witched at IC9. The
output audio signal is input to pin 1 of IC13 of stereo multiplex demodulator
through AF amplifier IC17. When the input audio signal doesn't have a pilot
signal, each audio signal is output from pin 9 and pin 10 to pin 1 and pin 16 of
the audio amplifier IC14 equipped with the electronic volume . After the volume
is adjusted, the signal is output from pin 7 and pin 10 to drive the speaker , etc.
When the input signal has a pilot signal, each audio signal is output; L side
signal is output from pin 9, and R side signal is output from pin 10.
Then the signals are input to the audio amplifier IC 14 equipped with electronic
volume; L side signal is input to pin 1 and R side signal is input to pin 16. After
adjusting the volume the signals are output; the L side from pin 7 and the R side
from pin 10 to drive the speaker, etc.
VCO for the 1st local consists of the Colpitts oscillator. D15, D16 and L4
determine the frequency, and the signal is oscillated at the transistor Q9. The
oscillated signal is supplied to pin 2 of PLL-IC1 passing through the buffer
amplifier Q11 and Q10.
The 2nd Local
8. PLL
The 1st Local
VCO for the 2nd local consists of the Colpitts oscillator. D20, D21 and L15
determine the frequency , and the signal is oscillated at the transistor Q19. The
oscillated signal is supplied to pin 19 of PLL-IC1 passing through the buffer
amplifier Q20.
PLL-IC1 is used to control the oscillating frequency of VCO . IC1 is controlled b y
the serial control signal sent from the microprocessor IC7. The ref erence frequency
of 12.8 MHz is generated by oscillating the crystal oscillator X1 inside
the circuit.
IC1 compares the frequency gained by dividing the signal added to pin 2 of IC1
by the control signal from IC7 with the frequency gained by dividing the
reference frequency of 12.8 MHz inside IC1. When the phase difference is
found as a result of phase comparison, the pulse signal is output from the
charge pump output of pin 8 of IC1, then the signal is conv erted into the DC
voltage at the activ e filter Q13 and Q14 and added to the cathode side of VCO
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The 2nd Local
vari-cap D15 and D16 to make the phases equal. In result the stabilized
oscillation can be done at the desired frequency.
IC1 compares the frequency gained by dividing the signal added to pin 19 of
IC1 by the control signal from IC7 with the frequency gained by dividing the
reference frequency of 12.8 MHz inside IC1. When the phase difference is
found as a result of phase comparison, the pulse signal is output from the
charge pump output of pin 13 of IC1, then the signal is converted into the DC
voltage at the inside circuit for active filter and added to the cathode side of
VCO vari-cap D20 and D21 to make the phases equal. In result the stabilized
oscillation can be done at the desired frequency.
When want to change the display, press the V/P/M k ey or BANK key.
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Item Adjustment Content Specification
Reference
Frequency
Adjustment
AF output
Adjustment
Stereo
Adjustment
SQL
Adjustment
( BP1 )
SQL
Adjustment
( BP2 )
SQL
Adjustment
( BP3 )
SQL
Adjustment
( BP4 )
Adjust the TC1 to 391.05MHz.
Display : FrE9 Adjust Point : TC1
Check Point :
TP2
AF maximum output Display : FrEq
Input the 142.6MHz of 30dBu to the test unit which
modulation is 1KHz 3.5KHz and adjust the L40 to become
maximum AF leve l.
Adjust Point : L40 (A side of main board)
Pilot Frequency Adjustment Display:pLt-F
Input the 90.5MHz of 30dBu (no modulation) and adjust the
VR1 to 76KHz of the Pilot Frequency. (Connect the
Ear-phone plug when adjust this item.)
Adjust Point : VR1 Check Point : TP15
SQL level 1 Adjustment Display : 1n1
Input the 14.3MHz of –8dBu (standard modulation), and
press the SCAN key.
Check if can hear the BEEP sound, when press the SCAN
key.
SQL level 5 Adjustment Display : 1nF
Input the 14.3MHz of -2dBu (standard modulation), and press
the SCAN key.
Check if can hear the BEEP sound, when press the SCAN
key.
SQL level 1 Adjustment Display : 2n1
Input the 109.15MHz of –10dBu (standard modulation), and
press the SCAN key.
Check if can hear the BEEP sound, when press the SCAN
key.
SQL level 5 Adjustment Display : 2nF
Input the 109.15MHz of -4dBu (standard modulation), and
press the SCAN key.
Check if can hear the BEEP sound, when press the SCAN
key.
SQL level 1 Adjustment Display : 3n1
Input the 145.13MHz of –8dBu (standard modulation), and
press the SCAN key.
Check if can hear the BEEP sound.
SQL level 5 Adjustment Display : 3nF
Input the 145.13MHz of –2dBu (standard modulation), and
press the SCAN key.
Check if can hear the BEEP sound.
SQL level 1 Adjustment Display : 4n1
Input the 290.15MHz of –8dBu (standard modulation), and
press the SCAN key.
Check if can hear the BEEP sound.
SQL level 5 Adjustment Display : 4nF
Input the 290.15MHz of –2dBu (standard modulation), and
press the SCAN key.
Check if can hear the BEEP sound.
391.05MHz
+
-100Hz
More than
20mw(8Ω)
76KHz
+-1KHz
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Item Adjustment Content Specification
SQL
Adjustment
( BP5 )
SQL
Adjustment
( BP6 )
S Meter
Adjustment
( BP3 )
SQL
Adjustment
( WFM )
S Meter
Adjustment
( WFM )
Battery
Indication
Setting
SQL level 1 Adjustment Display : 5n1
Input the 435.13MHz of –6dBu (standard modulation), and
press the SCAN key.
Check if can hear the BEEP sound.
SQL level 5 Adjustment Display : 5nF
Input the 435.13MHz of 0dBu (standard modulation), and
press the SCAN key.
Check if can hear the BEEP sound.
SQL level 1 Adjustment Display : 6n1
Input the 797.1MHz of –4dBu (standard modulation), and
press the SCAN key.
Check if can hear the BEEP sound.
SQL level 5 Adjustment Display : 6nF
Input the 797.1MHz of 2dBu (standard modulation), and
press the SCAN key.
Check if can hear the BEEP sound.
S Meter level 1 Adjustment Display : 3S1
Input the 145.13MHz of –5dBu (standard modulation), and
press the SCAN key.
Check if can hear the BEEP sound.
S Meter level 5 Adjustment Display : 3SF
Input the 145.13MHz of 15dBu (standard modulation), and
press the SCAN key.
Check if can hear the BEEP sound.
SQL level 1 Adjustment Display : Wn1
Input the 90.5MHz of 6dBu which modulation is 22.5KHz, and
press the SCAN key.
Check if can hear the BEEP sound.
SQL level 5 Adjustment Display : WnF
Input the 90.5MHz of 18dBu which modulation is 22.5KHz,
and press the SCAN key.
Check if can hear the BEEP sound.
S Meter level 1 Adjustment Display : WS1
Input the 90.5MHz of 13dBu which modulation is 22.5KHz,
and press the SCAN key.
Check if can hear the BEEP sound.
S Meter level 5 Adjustment Display : WSF
Input the 90.5MHz of 20dBu which modulation is 22.5KHz,
and press the SCAN key.
Check if can hear the BEEP sound.
Turn on the Reduction Battery Character
Display : dSpv
Change the input voltage from 4.5V to 3.8V, and press the
SCAN key.
Check if can hear the BEEP sound.
( After checking return the voltage to 4.5V.)
After finishing all adjustment items, press the FUNC key, and
then change the mode from adjustment mood.
( If want to change the mode before finish the adjustment,
press the FUNC key before get off the adjustment mode.)