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(0) FM - Abgleich
BeINIGDSAll skills
imine
FM
MeBDUNKE ....... ccc ee teeeseneeteeeee teens Lautsprecherausgang (R + L)
Eimsteller sicscnariearic esos
R 364, R 313
Spezifikation ..........- s h i gceeninnayke - 20 dB, Maximum
MeBinstrumMent .......-....
eee
NF-Millivoltmeter
Signalquelle ..........:cceeseeee ress MeBsender
f = 98,2 MHz, f,, = 1 kHz
Hub:=22,5 kHz
Signaleingang .........- ee
E'= 43 +4 dBuV / 60 dBuV
(+Bedampfung!)
FM-Alignment
Adjustment of the 19KHz pilot frequency
Operating: MOde: aicasiacigeed es FM
po
Measuring point ............ ee MP19 + MP20 (D300/24+23)
Alignment element .............6. R 305
SH ECINCATON 5 ottecctnsctcteces 19 KHz + 50 Hz
Measuring instrument .............. Frequency counter
1.
Connect MP20 (V310 pin 23) via a resistor of 180 kohms to
ground.
2.
Connect the frequency counter via a resistor of 100 kohms to
MP19 (V310 Pin 24) and use R305 to adjust a pilot frequency of
19 kHz + 50 Hz.
Use the dummy antenna (8 627 105 356).
Operating Mode iii
.cnciecnwe FM
Measuring point ............ ee loudspeaker output (R + L)
Alignment element .............660 R 364, R 313
SPCC AION: atattuistcieuass: - 20 dB, maximum
Measuring instrument .............. AF millivoltmeter
Signal SOUCE iat werssvrteisroon signal generator
f = 98.2 MHz, f,., = 1 kHz,
frequency deviation = 22,5 kHz
SIGhal (NUE cednsarmnrthremaeiaiens E'= 43 +4 dBuV / 60 dBuV
(+attenuation!)
1.
Adjust the signal generator to 98.2 MHz and adjust an output
level of E'= 60 dBuV (observe the attenuation of the dummy
antenna).
Modulate the signal generator with a stereo signal of the stereo
encoder (1 KHz AF / 22.5 kHz deviation / 7.5 kHz pilot
deviation).
2.
Tune the set to 98.2 MHz ( station preset button FM1 ).
3.
Set the stereo encoder to R.
Connect the AF millivoltmeter to the R loudspeaker output (The
speaker output must be terminated with 4 ohms).
Adjust the volume to 2.8 volts rms at the output. Read and keep
in mind the respective dB value.
4.
Then set the stereo encoder to L and use R 313 to adjust the
right channel output to minimum in order to obtain the maximum
stereo channel separation (2 33 dB).
5.
Adjust the signal generator an output level of E'= 43 dBuV
(observe the attenuation of the dummy antenna). Modulate the
signal generator with a stereo signal of the stereo encoder (1
kHz AF / 22.5 kHz deviation / 7.5 kHz pilot deviation).
6.
Set the stereo encoder to R.
Connect the AF millivoltmeter to the R loudspeaker output. The
speaker output must be terminated with 4 ohms.
Adjust the volume to 2.8 volts rms at the output. Read and keep
in mind the respective dB value.
7.
Then set the stereo encoder to L and use R 364 to adjust the
right channel output to - 20 dB.
( \f a separation of 20 dB is not adjustable,
the r-f level of
E'= 43 dBuV has to be altered within its tolerances of +4 dBuV.
a
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