AM TUNER ALIGNMENT
AM ALIGNMENT – FUNCTION switch to AM position.
Maintain generator output
as low as possible for suitable indication.
Note: Perform this aiignment after FM Tuner Alignment.
#
iTEM
GENERATOR
DiAL SETTiNG iNDICATOR
PROCEDURE
1. AM iF Connect 450kHz Radio Position of
Connect Radio IF
Adjust AM IFT (T805) for maximum
ALIGNMENT iF Genescope output to non-interference
Genescope input gain and best symmetry.
AM antenna terminai Minimum
to TP807 and
Keep signal low enough for noise
adjust output ievel to Frequency. ground iead to
on response
70dBpV.
chassis.
2. AM RF
Do not connect
Set Preset Connect DC Volt- Adjust AM OSC (T803) until
FREQUENCY
generator. STATION button
meter to TP802
DC Voltmeter reads 7.7V.
COVER to “2” position.
and ground iead to
ALiGNMENT
Set to 1602kHz. chassis.
(1602kHz)
3. Same as above. Set Preset Same as above. Check DC Voltmeter for indication
(531kHz)
STATiON button 0.8V - 1.4V.
to “1” position.
Set to 531 kHz.
Note: Repeat the adjustments in items 2 and 3. Then, confirm that each voltage becomes 1.2V to 7.7V at receiving frequency
of 531kHz to 1602kHz. (See Teble 1)
4. AM RF
Connect Standard Loop Set Preset Connect AC VTVM Adjust AM ANT Coil (T801) for
TRACKING Antenna to output
STATiON button and Oscilloscope
maximum gain output.
ALIGNMENT
terminal of AM RF Signai to “3” position. to DAT OUT.
(603kHz)
Generator. Place Loop Set to 603kHz.
Antenna 60cm away from
Loop antenna (Unit).
5. Generator Setting to
Change Preset Same as above. Adjust AM ANT Trimmer (TC801)
(1404kHz)
603kHz or 1404kHz.
STATION button
for maximum gain output.
Modulate with 400Hz
to “4” position.
(30 % modulation).
Set to 1404kHz.
Note:
Repeat the adjustments in items 4 and 5. Then, confirm there is no tracking error.
6. AM AUTO
Change generator
Set Preset Front Panel Adjust P802 untii the TUNED
STOP setting to 999kHz and
STATiON button TUNED Indicator
Indicator partly light up.
SENSITiVITY
output ievei to
to “5” position.
Dispiay.
ADJUSTMENT 64dBpV/m.
Set to 999kHz.
. . . . ... . .. . . .. .. .
use a
screwarwer wnn plastlc grip for all adjustments.
.
AM Frequency Cover Range
Tuning Voltage Value at TP802
(Tabie 1)
I
531kHz
1602kHz
I
Minimum
0.8V
7.OV
Typical 1.2V 7,7V
Maximum
1.4V
6.3V
–15–
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