Realistic STA-7 - Page 12

START
ADJUSTMENT
REPAIR
REPAI
3)AM
RF/IF OPERATION CHECK
Adjust
AM lFlRF
Alignment.
(See
AM Alignment Section
on
page
17,)
Set SELECTOR
Switch to
AM.
Connect
Standard
Loop Antenna to
AM SG and
radiate signal
into the
AM
Ferrite
Antenna
L7O1.
Connect Oscilloscope,
Distortion
Meter
and
V.T.V.M. toTAPE OUT
jack
on set.
(See
Figure
9.)
AM SG
LOOP
ANTENNA
Figure 9
Check AM coverage: lowest
Dial
pointer position
should
be
under 520
kHz and
highest
position
should be over
1620 kHz.
Readjust AM
coverage,
(See
page
17 for AM Alignment.)
Coverage is less
than
520
kHz
*
1620
kHz.
Coverage is
at
least
520
kH.z
-
1620
kHz.
Check Antenna
Sensitivity
for
S
+
N/N
20 dB at 600,
1000and 1400
kHz.
Readjust
AM
tracking.
(See
page
17
for AM Alignment.)
AM
Sensitivity is worse
than
500
pV/m.
AM Sensitivity
is better than 500
pYlm.
(Nominal
Sensitivity
is
200pVlm).
L_z'_J
AM BAR
ANTENNA
Iteo"mt L/
SET
I l// f--
OSCILLOSCOPE
V,T.V,M,
DISTORTION
I/IETER
-12-