Sangean WR-2, Service Manual

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WR-2L
4. ALIGNMENT FOR AM/LW SENSITIVITY
a. Required Instruments
AM Signal Generator
SSVM
b. Alignment Procedure
Mode Adjustment Procedure
(1) Turn on the radio.
(2) Connect a SSVM to the speaker TP7 and TP8 terminals.
(3) Connect an AM signal generator together with standard loop dummy
antenna and feed 30% modulated signal to the AM ferrite bar antenna L2.
(4) Tune the generator frequency to 1404 kHz.
(5) Tune the AM frequency to 1404 kHz and adjust TC1 to have a max.
reading on SSVM.
(6) Return the generator frequency to 603 kHz.
(7) Tune the AM frequency to 603 kHz and adjust L2-1 to have a max.
reading on SSVM.
AM
TC1
L2-1
(8) Repeat (4) to (7) as necessary to minimize tracking error.
Mode Adjustment Procedure
(1) Turn on the radio.
(2) Connect a SSVM to the speaker TP7 and TP8 terminals.
(3) Connect an AM signal generator together with standard loop dummy
antenna and feed 30% modulated signal to the AM ferrite bar antenna L2.
(4) Tune the generator frequency to 270 kHz.
(5) Tune the AM frequency to 270 kHz and adjust TC2 to have a max.
reading on SSVM.
(6) Return the generator frequency to 162 kHz.
(7) Tune the AM frequency to 162 kHz and adjust L2-2 to have a max.
reading on SSVM.
LW
TC2
L2-2
(8) Repeat (4) to (7) as necessary to minimize tracking error.
c. Instrument Connection
TC2
MW COIL
LW COIL
TC1
L2-2
L2-1
60 cm
The radio is located
perpendicularly to
the Loop Antenna
Loop Antenna
AM Signal Generator
TP8
TP7
DVM
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