Revox B261 Serviceanleitung Seite 44

sT[JDtrR
REVOX
8261 SA
sEcrroN
4/3
Required
measurJ_ng
instrument:
-
FM
standard-signal generator,
unmodulated
-
RF
voltmeter
- Digital
frequency counter
with
CRO
probe
10:
J,
Caution:
Do not change the setting
of Ll and L2 (on I.726.730)l
Adjusting procedure
- Press station
selector
key 1
(
87.5
I,lHz )
.
- Connect digj-taJ_ frequency counter to test point Mp4 (white
stranded wire,
1
.726.740, Fig. 4.4
) .
- Adjust transmitting
frequency of standard-signal
generator
so that the frequency countei indicates
f0.7
MHz
15
k:az.
- The needle of the center tuning meter should Ue apfroximately
in the middle.
- Connect
RF voltmeter to test point
Ätp3
(R17, IC3 pin l,
L.726.740, Fig. 4.4\
.
Feed approx. 200 ...
400 pV
EMF
from the standard_s_ignal
generator into the antenna input.
The IF foltowing
tlie
amplification
must not be clrpped (reading on
RF
ioltmeter
200 ...
400
mV).
Set standard-signal
generator to 90
MHz.
Press station
sefector key 2 (9O
tqiHz)
and adjust L3 to L6
and
L8 to
maximum
vol-tage on Lhe
RF voltmeter.
i
Set standard-signal
generator to f06.0
MHz.
Press stat j-on selector
key 4
(
106
i,lHz
) and adjust
c6/cr8/c22/c32/c36
for
maximum vorrage on the
RF
voltmeter (Fig. 4.3)
Since there is mutual- influence
in these adjustments, they
must
be repated untj_l the optimum is reached. Thä .."ar"g
on the
RF
voltmeter should not exceed 400
mV
while
makj-ng tneJe
adjustments, otherwise the gain will
be limiteä.
,-
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l ll'
,ffi
ffi]
ll
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ä
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L.1 26.7 40