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EQUIPMENT REQUIRED
Signal Source
1.MW/LW signal generator (AM SG)
2. FM signal generator (FM SG)
3. Sweep generator (10.7 Mhz for FM)
Output Indicator
1. SSVM
2. Oscilloscope
3. Frequency Counter
General preparation
1. Check source voltage.
2. Set function switch to band being aligned
3. Turn volume control to minimum (unless noted otherwise)
4. Connect low side of signal and output indicator to chassis ground unless otherwise specified.
Keep ground connection close to high side connection.
5. Keep signal inout as low as possible to avoid AGC and AFC action
(set output indicator to high sensitivity.)
6. Standard modulation is 1000 Hz AT 30% amplitude for MW/LW (1000 Hz at 22.5 kHz deviation for FM)
AM IF ALIGNMENT
Signal source (AM RF Gen) Connect
Step
to
1
A standard radiation loop
2
Repeat for maximum output
MW RF ALIGNMENT
Signal source (AM Signal Gen.)
connect to
1
2
A standard radiation loop antenna
3
4
5
Repeat Steps 3 and 4 as necessary to minimize tracking error. Also repeat steps 1 and 2 if necessary.
LW RF ALIGNMENT
Signal source (AM Signal Gen.)
connect to
1
2
A standard radiation loop antenna
3
4
5
Repeat Steps 3 and 4 as necessary to minimize tracking error. Also repeat steps 1 and 2 if necessary.
FM RF ALIGNMENT
Signal source (FM Signal Gen.)
Step
Connect to
1
2
TP 1, GND (Test point) through
matching network if necessary
3
4
5
repeat steps 3 and 4 as necessary to minimum tracking error. Also repeat steps 1 and 2 if necessary.
* UK models must not be able to tune below 87.5 MHz.
ALIGNMENT PROCEDURE
MODEL NO. GRUNDIG SONOCLOCK SC 51
Aligment indicator connect to
Set signal to
Oscilloscope or SSVM
460 KHz
T4 Detector Output Terminal
Set signal to
Alignment indicator Connect to
515 KHz
(modulated)
1640 KHz
(modulated)
Across speaker voice coil
600 KHz
(modulated)
1440 KHz
(modulated)
Set signal to
Alignment indicator Connect to
140 KHz
(modulated)
290 KHz
(modulated)
Across speaker voice coil
153 KHz
(modulated)
261 KHz
(modulated)
Alignment indicator (oscilloscope ,
Set signal to
VTVM Connect to
87.35 MHz
modulated
108.25 MHz
modulated
Across speaker voice coil
90 MHz
modulated
106 MHz
modulated
Set radio dial to
Adjust
T3
Quiet point
Set radio dial to
Adjust
515 KHz
T1
(Osc,
(lowest end)
coil)
1640 KHz
TC4
(Highest end)
(Osc, trim)
600 KHz
L2 (ant coil)
1440KHz
TC3 (ant trim)
Set radio dial to
Adjust
140 KHz
T2
(Osc,
(lowest end)
coil)
290 KHz
TC6
(Osc,
(Highest end)
trim)
153 KHz
L3(ant coil)
261 KHz
TC5 (ant trim)
Set radio dial to
Adjust
87.35MHz
L1 (Osc, coil)
(lowest end)
108.25MHz
TC2
(Highest end)
(Osc, trimmer)
L2 (RF coil)
90MHz
stretch or
squeeze
106MHz
TC1 (RF trim)
Adjust for
Remarks
Volume control min
Maximum
position
Adjust for
Remarks
Volume control max-
Maximum
position
Adjust for
Remarks
Volume control max-
Maximum
position
Adjust for
Remarks
Volume control Max-
Maximum
position
Sonoclock 51 SC 5301
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