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RECEIVER
ALIGNMENT
EQUIPI,IENT
REQUIRED
1.
RF
Signal Generator
(450-474
lIHz)
2,
DC
Vol
trneter
3
.
AC
Vol tmet
er
4.
Recelver
RI Detector
Probe
19C330130G2
5.
RF
Signal
Probe
19C330129G1
6.
DC
ProL'e
19C330165G1
7.
Power
Supply, 13'8 V
Regulated
8.
VOM
(20K
ohms/volt)
9. 4
ohm,
5
watt resistor
ALlGNMENT
PROCEDURE
PRELIMINARY
CHECKS
1.
Plug
crystal
Y301 in--i
oscillator
socket
X301.
2.
J.
Disable
Channel
Guard :!
removing
mlcrophone from the op::-ia 1
Channel
Guard hookswitch
(if
pr:seLt),
or
by
connecting ground to J91C-t,
Disconnect interna 1 spea:=r from
J904
on
IOC
board.
Terminate sither
J910-3
or J904 wlth a 4 ohm, 5 l::t
resistor.
NOTE
Refer
to
CONTROLS
STALS.
.
photographs
TEST
POINTS
rc locate
I\D
CRY-
STEP
METERING
TEST
POINT
PROBE
TUNING
CONTROL
(s)
PROCEDURE
1ST
OSCILLATOR MULTIPLIER
1
2
4
5
TP351
TP351
TDAqI
TP4O
1
TP4O
1
DC
Protle
DC
Prohe
Probe
DC
RX
RF'
Det
ec
t
or
RF
Signa
l
L30
1
L351.L352
L354
c358,L355
L354
L30
1
With
voltmeter on
lowest
maximum
meter reading,
range adj:st
L301 for
Alternately adjust
L351
meter reading,
Adjust
C358
for dip
then
dip
L355.
Adjust
L355
then
L354
and
meter
reading.
Continue
controls until no further
recorded. (Typically
0.6
and L352
for
maximun
peak
L354
and
e?5*
"93t4
for
maximum
peaking
these
improvement
is
volts.
)
Connect
a frequency counter to
TP401
using
RF
signa
I Probe.
Adjust L301 for
channel
operating
frequency.
If
no meter indi.cation
is
observed
at TP351, connect positive
leaci of
RF Detector probe (red dot) to
J301
using a short
piece of DA
j',.lmper
wi
re
(AWG
#18 or
sma
I
ler
-
7
.o24
nnm). See photograph for access to
J301,
Adjust L301 for
maximum
treter
reading then reconnect
DC
Probe to
TP351.
IF
ALIGNMENT
6.
TP4O
1
TP5O
1
RF
Signal
RF
DETECTOR
L409
,
L503
L502
,
L501
Connect
RF
signal generator to
TP401
using
RI
Signal Probe.
Connect
RF
DETECTOR
Probe
and
VOM
to TP501,
Use
0,5 to 1.0 V scale.
Set
RF
signal generator output to channel frequency at
the mininum level sufficient
to provide a
mld
scale meter indication.
Reduce
the output of the signal generator
as
required to keep the detected
RF
level within
the 0.5 to 1.0 volt
range.
Adjust L409 first,
then L503, L502 and L501 respectively
for
maximum
indlcation
on meter.
Alternately
adjust L409 and L501 to obtain
maximum
meter
reading.
Disconnect
RF
Signal Generator
from
TP401.
1.
Connec'
2.
Press
:
nomi
na
3. Set
SQi
4.
Adjust
5.
Adjust
6.
Check
(+1
dB:
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