Sangean U-3, Service Manual

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4. ALIGNMENT FOR AM 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 TP8 and TP9 terminals.
(3) Connect an AM signal generator together with standard loop dummy antenna and
feed 30% modulated signal to the AM ferrite
(4) Tune the generator frequency to 1404 kHz.
(5) Tune the AM frequency to 1404 kHz and adjust TC2 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 bar antenna to have a max reading on
SSVM.
AM
TC2
Bar Antenna
(8) Repeat (4) to (7) as necessary to minimize tracking error.
c. Instrument Connection
L8
L7
TC2
60 cm
The radio is located
perpendicularly to
the Loop Antenna
Loop Antenna
AM Signal Generator
TP9
TP8
DVM
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