Realistic trc-448 Service Manual page 13

TRANSMITTER SECTION ALIGNMENT CHART
STEP
CONTROL
SETTING
TEST
EQUIPMENT
TEST
EQUIPMENT
SETTING
ADJUST
REFER
TO
1
BPF
MODE — AM
CH-19
Sweep Generator Freq. : 27 MHz
T201 — 204 for max. out-
put best wave form
Fig. 2
2
MODE — AM
CH-19 DC
RF Power Meter
502 dummy load
DC current meter
Connect in series
at TP-216
VR202 for 15 mA on the
current meter
3
AM
POWER
MODE — AM
CH-19
RF-Power Meter
502 dummy load
T205 — 208, L207, 208
for max. output Fig. 3
4
AM
POWER
MODE — AM
CH-19
RF Power Meter
502 dummy load VR-210 for 3.8 W output
Fig. 3
5
BM
MODE — LSB or USB
CH-19
RF Power Meter
502 dummy load
AF Generator
Monitor Scope
AF Generator
Freq. : 1 kHz
Set the AF
Generator out-
put to get
approx. 10 W.
VR-3, TC-7, T9 for min.
carrier
Fig. 4
6
SSB
MOD
MODE — LSB or USB
CH-19
RF Power Meter
50
5
2 dummy load
AF Genarators
Monitor Scope
2 AF Generators
Freq. :
500/2400 Hz
Output :
.
approx. 30 mV
Set VR-204 to 0 ohm.
(fully counterclockwise)
VR-4 for 11 W PEP
output
Fig. 5
7
AM
AMC
MODE — AM
CH-19
RF Power Meter
502 dummy load
AF Generator
Monitor Scope
AF Generator
Freq. : 1 kHz
Set the output
to 50% Mod.
+ 16 dB
VR-5 for clean wave
form with no over modu-
lation ( should be 85—
90% mod).
Fig. 3
8
ALC
MODE — LSB, USB
or AM
RECEIVE
DC VTVM
Connect DC
VTVM to TP-208
(use TP-209 for
ground connec-
tion)
VR-207 for 1.2-1.8V
9
ALC
MODE — LSB or USB
CH-19
RF Power Meter
502 dummy load
AF Generator
Monitor Scope
AF Generator
Freq. : 1 kHz
Output: 15 mV
+ 6 db
VR-204 for 11 W PEP Fig. 5
10
TWO
TONE
MODE — LSB or USB
CH-19
RF Power Meter
502 dummy load
AF Generators
Monitor Scope
2 AF Generators
Freq.
500/2400 Hz
Output:
Approx. 30 mV
VR-201 for clean wave
form
Fig. 5
NOTE :
You can check 7.8025 MHz in
AM
transmit mode at
TP-204.
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