Revox B261

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.
,- __@*,
l ll'
,ffi
ffi]
ll
r?
r$r 9
ä
F
$rEF
"rfll\
B
L.1 26.7
40