Sangean ATS-818 User manual

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ATS-818
A World of Listening
SANGEAN
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PLL SYNTHESIZED worLbD BAND RECEIVER
The SANGEAN ATS-818 is the WORLD'S ONLY Portable World Band Receiver offering
more features and performance than many expensive table top Short Wave
Receivers.
PLU45|O-|& (CO lOlE|@
synneseeo RADI
inectwven || memory |{ ‘ocx || uct || rime Ser |[OUAL Time] [FM STEREO] art
* All SW Bands from 120m to 11m _—_* 45 Memory Presets * RF Gain Control
* Radio/Buzzer Clock Alarm * AM Wide/Narrow Filter * Dual Conversion Receiver
* BFO for Single Side Band & CW * Dual Time Display for Local * Signal Strength & Battery
* Continuous AM Coverage and UTC Time Indicator
from 150-29999KHz plus FM 87.5- * Adjustable Sleep Timer * Tone Control & Safety Lock
108MHz
* Five Tuning Methods: Direct frequency Input, Auo Scan, Manual Scan, Memory Recall, Rotary Dial
SPECIFICATIONS ] FREQUENCY 2.300-2.495MH2(120m) 3.200-3.400(90m) 3.900-4000(75m) 4.750-5.060(60m)
5.950-6200MHz(49m) 7.100-7.300(4 1m) 9.500-9.900(3 1m) 11.650-12.050(25m)
| 413.600-13.800(21m) 15.100-15.600(19m) 17.550-17.900(16m) 21.450-21.850(13m)
| 25.670-26.100(11m)
SEMI-CONDUCTORS: 1 LSI, 12 IC’s, 8 FET's, 48 Trans., 45 Diodes. 2 LED | OUTPUT PWR: 800mW | SPKR: 4 inch, 4 ohm
BATTERIES: 4/1.5VDC “D” Size Radio Power & 3/1.5VDC AA Back-Up Power _| ACCESSORIES: AC Adapt, Ext. Antenna Adapt, Shortwave HandBook
2651 Troy Avenue, South El Monte, CA 91733
AMERICA, INC. Tel: [phone] Fax: [phone]

Service|\ianua
TS-818
CONTENTS
Specifications
Disassembly Instructions
Block Diagram ......
Alignment Instructions spear
Alignment For Clock Time Accuracy ..
Alignment For PLL Frequency .................05.
Alignment For AM 2nd Local OSC
Alignment For AM 2nd IF .........
Alignment For FM IF
Alignment For AM Sensitivity ...
Alignment For BFO..........26..
Alignment For FM Sensitivity
Alignment For MPX
Alignment For Indication Level of Battery .
Alignment For Signal Strength Level .....
Alignment For 450kHz Trap .....
Alignment For FM Station Detection
Troubleshooting Flow Chart
Wiring Diagram
Main PCB Chip Side View
Main PCB Top View...........
Control PCB Chip Side View .............
Control PCB Top View .... Speen
Electrical Parts List a
Semiconductor Lead Identifications
Exploded View .........
Mechanical Parts List..
IC Circuit Block Diagram ...
ICs’ & Transistors’ Voltage List ee yO
SChemmatice- Diagram wasrseiceesccssacs acces eatce cs vonie ds irene nsaeacennostasladvaNcancaue tetutvevavcesceseysseneshnansbghronerssug-cotratemdenetee

SPECIFICATIONS
FM
TEST ITEM CONDITION : NOMINAL LIMIT UNIT
Tuning Range Mi ef te OS | |
wae
Max
|
(1080
[20.15
|
MHz
_|
Intermediate Freq. 10.7
SOMHz i
Max. Sens.
Usable Sens. (S/N 30dB)
Calibration
Dial
Audio Fidelity -3dB (W/Pre-emphasis)
3dB Limiting (1mV)
Lowest Battery Voltage Vv
Max. Output Power MRE eal A] a |
Output Power At 10% T.H. D. 98MHz
Alter. Channel Select. 100uV 98MHz 25 Bacal
Stereo Indicator Sens. 98MHz 24 | Bp |
Tuning inaicator Sens. (2nd: do) | sez [| 24 ou]
98MHz 25 2 5a20 [eR 375 |
[Auto Scanning Stop Seng. 0M
| Ovenoaed Capacity: io: is es OMB i a | OO as |
AM. Suppression (dB) _——S*YCS ee
CLEC 1 eee eae nnraae Le |) ee nn aR IS Petty Tred
[Tone Aetion({0kHz) | a ae ee ape
SIN (225kHz Dev) | OMe | 80. elena Seed geen
Supply Voltage: DCBV___ALO: 50m

TEST
ITEM
CONDITION
|
NOMINAL
|
LIMIT
|
_UNIT
Tuning
Range
Min:
S20
|
_
Max.
|:
1620/1710
+5
kHz
Intermediate
Freq.
seas
+1
kHz
Sa
i
ee
ee
Cee
2
|
Max.
Sens. 1000kHz
Perea
oes
mt
|
Lil
58 dBu/m
56 dBulm
56
dByu/m
600kKHz 58 64
Usable
Sens.
(S/N
20dB)
62
dBu/m
1400kHz 56 62 dBy/m
£5
Dial
Calibration
NOONE
He
88
aps
paper
ese
So
AG
Avle
ORME
sc8
“7s
Ore
|
ee
|
[AGC
IROM:
Serene
aie
|
a
ees]
[Image
Rejections
a
aie
ee
a]
De
ee
ae
ee
Whistle
Modulation
(SmV/m)
epimeaiee
[is
een
Hom
Modolaboneismvy
=
5
A
AO
Bd
|
Tuning
Indicator
Sens.
(2nd.
dot)
|
1000KHz_
|
tS
Bm
|
|
Auto
Seanning
Stop.
Sens.
<=
9S
tooo
0
Balin
|
Tone
Acton:
(Gihiz)
-}
th
a
OOO
ee
aia
SIN
Ratio
(SMW
Se
poi
cr
Se
|
|
|
Current
Consumption
Pd
ae
ers
Output
Power
At
10%
T.H.O.
700
Overload Capacity (30% Mod 10% T.H.D.) 1000kHz
Bandwidth 6dB (Wide)
Bandwidth 6dB (Narrow
Supply Voltage: DC 6V * R.0.: 50mW
dBu/m
kHz
2.507 kHz
Modulation: 1kHz 30% Mod.
>
2
o

TEST ITEM
Tuning Range
Intermediate Freq.
Max. Sens.
Usable Sens. (S/N 20dB)
Dial Calibration
Audio Fidelity (-6dB)
A.C. A. (+ 10kHz)
T.H. D. (60 dBp) -
A.G.C. F.O.M. {86 dBu)
Image Rejection
S/N Ratio (60 dBy)
SSB/CW Sens. (S/IN=10dB
Supply Voltage: DC 6V
i CONDITION NOMINAL LIMIT
Min. 1621/1711 +5
2300kHz
15900kHz
25600kHz
15100kHz
15100kHz
15100kHz
15100kHz
15100kHz
15100kHz
15100kHz
21 F/3 IF
x x
ae
st re
Nh
oo
a @
ho
én] on 1+] Ft
9 ° alo
N o
|
b N
15100kHz
15100kHz
15100kHz
15100kHz
15100kHz
|
£
15100kHz
15100kHz
-
R.0..
50mW
Load:
4
ohm
Modulation:
1kHz
30%
Mod.

LW
TEST ITEM CONDITION NOMINAL LIMIT UNIT
eee
ee
aes
ee
eee
ee
Tuning
Range
[ae
i
Ist.lF
55845
Intermediate
Freq.
;
PAG
IE
450
:
s
|
[68
|
aan
|
[66
|
Balen
|
Ree
ae
Se
ee
ee
ee
a
ae
TT
k
+ Hz
+ Hz
64
74
72
70 dBuim
kee
*5 Hz
Hz
Vv
70
72
Max. Sens.
Usable Sens. (S/N 20dB)
Dial Calibration 218kHzZ
2aikHeZ
Lowest Battery Voltage 218kHz
25
4.2
ERS
Ea
es
eee
Eee
ee
BS
Eee
ss Se dee
SIN Ratio (5mV 218kHz Po Bae Pe ae |
Note : Nominal specs represent the design specs. All units should be able to approximate these-some will exceed
and some may drop slightly below these specs. Limit specs represent the absolute worst condition that still might
be considered acceptabfe ; in no case should a unit fall to meet limit specs.

DISASSEMBLY INSTRUCTIONS
TO REMOVE BACK COVER
a. Unscrew 5 screws A.
b. Separate front and back cabinet.
Cc
TO REMOVE MAIN PCB
a.
Remove
3
screws
C.
eo
c
b.
Remove
Main
PCB
and
1
screw
DO.
[|
i
D
=
ES
TO REMOVE CONTROL PCB
a. Remove 5 screws E.
b. Remove Control PCB.

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ALIGNMENT INSTRUCTIONS
Note: (1) All test points are shown on schematic diagram,
(2) Load in fresh batteries before any alignment procedures.
(1) ALIGNMENT FOR CLOCK TIME ACCURACY
a. Required Instrument
Frequency Counter
b. Alignment Procedure
[ Adjustment | Procedure
(1) Turn the radio to SLEEP ON mode.
(2) Set the SAFETY switch upward to electrically lock all push buttons.
(3) Remove the batteries from the RADIO BATTERY compartment. The monitor TIME
BASE signal starts functioning.
(4) Connect a frequency counter to TP 15.
(5) Adjust TC401 to reach a reading 524288 + 4Hz ( = 7.6PPM or + 20sec/month) on
counter,
c. Instrument Connection
TC401
Freq. Counter
Test Point

Freq. Counter

(2) ALIGNMENT FOR PLL FREQUENCY
a. Required Instrument
Frequency Counter
_ b. Alignment Procedure
Mode | Adjustment | Procedure
(1) Turn the radio ON.
(2) Select the tuner frequency at 108 MHz.
FM TC4 (3) Connect the test probes of frequency counter to TP7 and ground. The ground
point should be as near as possible to the test point TP7
| (4) Adjust TC4 to have a reading of 118.69975MHz-118.70025MHz.
c. Instrument Connection
TCc4
= SSSI SRR
DNS?
rea
Test Point
TP7

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ASS rs se) fh o vee
DP) i =
fart VY tel
> Lf . (ise! Vous
—
Test Point
TP7

(3) ALIGNMENT FOR AM 2ND LOCAL OSC
a. Required Instrument
Frequency counter with higher impedance probe.
b. Alignment Procedure
Mode | Adjustment | Procedure
(1) Turn the radio ON.
(2) Tune the frequency far away from any station to avoid interference.
(3) Connect the test probes of frequency counter to TP8 and ground.
(4) Adjust L14 to have a reading of 55.39485MHz-55.39515MHz.
AM Li4
Caution : A loading effect could emerge in the circuit if inserted with a lower impedance probe of fre-
quency counter.
c. Instrument Connection
es I
Freq. Counter

Freq. Counter
Test Point
TP8

(4) ALIGNMENT FOR AM 2ND IF
a. Required Instrument
AM IF Sweep Generator with Scope
b. Alignment Procedure
Mode Adjustment | Procedure
(1) Turn the radio ON.
(2) Set the bandwidth switch to WIDE position.
(3) Connect the input terminal of AM IF sweep generator in series with a capacitor of
10uF to the test point TPS.
T4 | (4) Connect the RF output terminal of AM IF sweep generator in series with a
AM Té6 capacitor 0.1pF to another test point TP8.
(5) Adjust T4 to have a max. output with a marker frequency of 450kHz on the sweep
scope.
(6) Adjust T6 to have a max. output with a marker frequency of 450kHz on the sweep
scope.
(7) Repeat (5) and (6) until a max. 450kHz output is reached.
c. Instrument Connection
Wa
x
STS
NED
Test Point
TPS
Test Point
TPS
AM IF Sweep Generator

Test Point
TP8
Test Point
TP5
AM IF Sweep Generator

(5) ALIGNMENT FOR FM IF
a. Required Instruments
FM IF Sweep Generator with Scope.
b. Alignment Procedure
Mode ; Adjustment Procedure |
|
7 (1) Turn the radio ON.
| (2) Connect the input of FM IF sweep generator in series with a resistor of 1.2K ohm
TS | tothe test point TPS.
i
!
i
i
17 (3) Connect the RF output of FM IF sweep generator in series with a resistor of 2.2K
ohm to another test point TP3.
(4) Adjust TS and T7 to have a max output and best symmetrical S curve with
respect to the center marker frequency of 10.7MHz.
¢, Instrument Connection
10.7MHz Marker
Test Point
TP3
2.2K ohm
FM IF Sweep Generator
12

Test Point
TP3
2.2K ohm
10.7MHz Marker
FM IF Sweep Generator
Test Point
12

(6) ALIGNMENT FOR AM SENSITIVITY
a. Required Instruments
AM Signal Generator
SSVM
Frequency Counter
b. Alignment Procedure
Mode | Adjustment Procedure
(1) Turn the radio ON,
(2) Set the bandwidth switch to WIDE and RF GAIN VR to MAX position.
(3) Tune the radio band frequency to 15.100MHz.
(4) Feed a signal with modulation from AM signal generator output to the test point
TP1 and connect a SSVM to speaker (TP 14).
(5) Tune the generator frequency exactly the same as that of the radio frequency
displayed.
(6) Adjust T1 and T3 to have a max. audio output.
(7) Connect the probe of frequency counter at the test point TP4.
(8) Adjust L14 to meet the specification frequency 450kHz + 0.15kHz.
(9) Remove the counter and repeat (6) to (8) until the specification frequency is met.
c. Instrument Connection
tM"
SSVM O
Test Point
AM Signal Generator
ars
Test Point
Freq. Counter
Test Point
TP4

i
Test Point
TP4