(> FM Abgleich
Bitte achten Sie darauf, daB die Stationstasten vor dem
Abgleich mit bestimmten Frequenzen belegt werden missen
(siehe Seite 6)
Einstellung der ZF - Begrenzung
Kinstliche Antenne verwenden.
Betriebsart .0.......... cece
FM1 - AS
Stationstaste ..........:.ccceeeeeeees 5 (97,1 MHz)
Me@Bpunkt ........
cece eeeceeereeeeeeees Lautsprecherausggang
Abgleichelement ...........--cce R 166
SpeZifikation
0.0...
ccs
-10dB+0,5 dB
MeBinstrument ........-..:::ceeeeeee NF - Millivoltmeter
Signalquelle 0.0.0... eeeeeeeeeees MeBsender
f = 97,1 MHz, f,,, = 1 kHz
Hub = 22,5 kHz
E' = 66 dBuV / 1,5 dBuv
(+Bedampfung})
Signaleingang
3.
Drticken Sie die Stationstaste 5 (97,1 MHz).
FM - ZF - Ablage
Kinstliche Antenne verwenden.
Betriebsart .....
Senedak FM1
Preset button .
aot
MeRBpunkte .........
ce eeecseeeree eee MP 800 (D800/3)
MP 151 (X1/9)
MP 2400 (D2400/28)
SL-Wippe (<I p)
Wechselspannungs-Minimum
Abgleichelement
Spezifikation
MeBgerate
...........eceeeeees Oszilloskop,
Gleichspannungsvoltmeter
Signalquelle 0.0... cece eee
Me®Bsender
f = 98,1 MHz, fo, = 1 kHz
Hub = 60 kHz
Signaleingang
E' = 60 dBuV (+Bedampfung!)
—
2.
Stellen Sie den MeBsender auf 98,1 MHz / 60 kHz Hub und
eine Modulation von 1 KHz ein.
3.
Speisen Sie nun das HF-Signal E' = 60 dBuV in die Antennen-
Legen Sie beim Einschalten den MP 800 auf Masse.
Driicken Sie die Stationstaste 1 (98,1 MHz).
Geben Sie den MP 800 wieder frei.
Stimmen Sie mit der SL-Wippe (<] p>) auf Wechselspannungs-
Minimum an MP 151 ab.
wirksam).
chert. Hierzu mussen Sie den MP 2400 einmal mit Masse
verbinden.
DOs
on
S172
FM Alignment
Please observe that the station preset push-buttons have to be
programmed to specified frequencies (see page 6).
IF - limiting adjustment
Use the dummy antenna.
Operating mode ..............0005 FM1 - AS
Preset push-button ...........005 5 (97.1 MHz)
Measuring point ..........0. eee
toudspeaker output
Alignment element .....
... R166
Specification .................
..- 10 dB + 0,5 dB
.. AF millivoltmeter
Signal generator
f = 97.1 MHz, f,,, = 1 kHz
deviation = 22.5 kHz
E'= 66 dBuV / 1.5 dBuV
(+attenuation!)
Measuring instrument ...
Signal source
Signal input
1.
Adjust the signal generator to 97.1 MHz, 22.5 kHz deviation
and a modulation of 1 kHz.
2.
Feed the RF signal E' = 66 dBuV into the antenna input
(observe the attenuation of the dummy antenna).
3.
Press preset push-button 5 (97. 2 MHz).
4.
Connect the AF millivoitmeter to the loudspeaker output (R or L)
and use the volume control to adjust an output level of 1.4 V_.
(the loudspeaker output must be terminated with 4 ohms).
Read and note the corresponding dB value.
5.
Reduce the generator signal to 1.5 dBuV at the output of the
dummy antenna (observe the attenuation of the dummy
antenna).
6.
Now the output level should decrease by 10 dB + 1 GB. If it does
not, use R 191 to set the correct value.
FM IF storage
Use the dummy antenna.
Operating Mode ........... cee
FM1
Preset push-button .................. 1
Measuring points ................06 MP 800 (D800/3)
MP 151 (X1/9)
MP 2400 (D2400/28)
seek rocker switch (<j p)
AC signal minimum
oscilloscope
DC voltmeter
signal generator
f = 98.1 MHz, f,,, = 1 kHz,
frequency deviation = 60 kHiz
E' = 60 dBuV (+attenuation !)
Alignment element
Specification
Measuring instruments
Signal source
Signal input ..........:.ccseeeeens
1.
Connect an oscilloscope to MP 151.
Adjust the signal generator to 98.1 MHz, modulated with 1 kHz,
60 kHz deviation.
3.
Feed the RF signal E' = 60 dBnV into the antenna input
(observe the attenuation of the dummy antenna).
4.
Connect test point MP 800 to ground when switching or.
5.
Press preset push-button 1 (98.1 MHz).
6.
Release the test point MP 800 from ground.
7.
Use the rocker switch <] or p to adjust the ac signalon the
oscilloscope to minimum at MP 151.
(The seek tuning is no longer operable in the servicem ode
now activated).
8.
The measured value will be stored as the actual IF freq wency.
To enable the storage briefly connect MP 2400
to gious nd.
The successful alignment is confirmed by a beep towne and
in addition the station preset push-button flashes twvice.
