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FM-Abgleich
Einstellung des Oszillators
BetrieDSart ......0......ccersseseneneeeees FM
Betriebsart 20.0...
cecseesesesseteeees FM
MeBOUNKT .......00..ccesecereerscesttenes MP-FSFM (DV5/12)
Abgleichelemente ..............-+105 L2,L4
SpeZifikation ..........ccessceeeereeees Maximum Gleichspannung
MeBinstrument ...........:-:seeeee Gleichspannungsvoltmeter
Signalquelle .........csecceeseeeeeee Mesender
f = 98,2 MHz, f,,, = 1 KHz
Hub = 22,5 kHz
FM - IF programming
Use the dummy antenna (8 627 105 356).
Operating Mode ...........cssererses FM
Measuring point ..........ceeeeeee MP28 (D801/25)
Signal SOUICE ..........cccesescreeeeenee signal generator
f = 98.2 MHz
frequency deviation = 22.5 kHz
Sighial INPUl cscctts
sc etectere cede E' = 26 dBuV (+attenuation!)
2.
Feed the RF signal E' = 26 dBuV into the antenna input
(observe the attenuation of the dummy antenna).
Tune the set to 98.2 MHz ( station button FM11 ).
4.
Connect MP28 to ground via a 1,2KQ resistor.
The display will show "LH".
Sad
FM alignment
Oscillator adjustment
OPSratinG MO! sa... ceccsveccinssesee: FM
Measurement point ..............0. MP-UFM (DV5/1)
Alignment element ............ L 45
Specification ........ccceeeeseseeeees 3.89 + 0.01V
Measuring instrument .............. digital voltmeter
1.
Tune the set to 98.2 MHz { station button FM1 ).
2.
Connect the digital voltmeter to MP-UFM and measure the
FM tuning voltage.
3.
Adjust coil L 45 such that the tuning voltage for 98.2 MHz
amounts to 3.89 + 0.01volts.
Adjustment of front and intermediate circuit
Use the dummy antenna (8 627 105 356).
Operating mode ...........
eee FM
Measuring point ................00 MP-FSFM (DV5/12)
Alignment element ............ee L2,L4
Specification ..........
cc cceseeseeees max. DC voitage
Measuring instrument .............. DC voltmeter
Signal SOULCE .........ccccessessrsseces signal generator,
f = 98.2 MHz, fo, = 1 KHz
Hub = 22.5 kHz
1.
Adjust the signal generator to 98.2 MHz, modulated with
1 kHz, 22.5 kHz deviation.
2.
Tune the set to 98.2 MHz ( station button FM1 ).
3.
Apply the RF-signai to the antenna input and adjust the RF
output such that a dc level of 2.5 volts appears at MP-FSFM.
4.
Reconnect the dc-voltmeter to MP-FSFM and align L 2 andl 4
to maximum dc-level.
ev tay 4 0
Mite
deal
en
ge
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