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| RT—S652
SW ALIGNMENT
CHART
Signal
Generator
Radio Dial Setting
Adjustment
Remarks
Frequency
Tuning Gang Fully Counter-
5.75 MHz
clockwise
(Lowest Frequency)
OSC. Coil
Adjust for maximum
'
L106
indication.
Tuning Gang Fully Clockwise
OSC. Trim.
Adjust for maximum
Toe
(Highest Frequency)
C011
indication.
Repeat steps 1 and 2 as required.
Ant. Coil
Adjust for maximum
L102
indication.
Ant. Trim,
' Adjust for maximum
Ccoo9
indication.
6.5 MHz
Tune to Signal.
14 MHz
No Adjustment
Repeat steps 4 and 5 as required.
FM-IF ALIGNMENT
. Set the select switch to FM position.
. Turn on both sweep generator and oscilloscope, and allow a fifteen-minute warm-up period.
. Connect the RF SWEEP
SIGNAL
OUTPUT
from the signal generator through the loop antenna to the receiver.
. Connect the oscilloscope vertical input directly to the test point TURN
OUT H and connect the shielded lead to
the test point E or chassis ground.
:
5. Connec the SWEEP
VOLTAGE
OUTPUT
of the sweep generator to the oscilloscope.
6. Proceed as outlined in the FM-IF ALIGNMENT
CHART.
PWN
=
FM-IF ALIGNMENT
CHART
Signal coupling
Equip.
Tuning
Connection
Pattern
Connect sweep
Sweep
Tuning Knob | Set scope for con-
Turn the !F Transformer
generator output to | generator of | fully counter- | necting output
L111 fully counterclock-
a three-turn loop
10.7 MHz
clockwise
signal from TUN
wise to obtain a single
antenna of 10cm
center freq.
(Lowest
OUT to vertical
peak. Adjust coil L105
diameter.
with 10.7
Frequency.)
axis of scope "V"'
in order until the best
MHz marker.
and sweep gener-
single peak is obtained.
ator output to
Figure 9.
horizontal axis
Finally turn the coil
"H",
L111 to obtain S curve.
See Figure 10.
IF Seeep Test
FM Sweep
Receiver
S Curve
FM-RF
ALIGNMENT
1. Turn on the signal generator and the VTVM, and allow a fifteen-minute warm-up period.
2. Connect the signal generator output through a 75 ohm dummy antenna across FM ANT.
3. Connect the VTVM
across the voice coil or a 3.2 ohm dummy
load.
4. Set the volume control to mid-position.
7
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