Transmitter Alignment; Transmitter Adjustments - Realistic TRC-457 Owner's Manual

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TRANSMITTER A L I G N M E N T
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,95Mt
.
--
,
Connect an RF wattmeter and 50-ohm, 25-watt dummy load to antenna connector.
NOTE: Be sure to check transmit frequency and power on all active channels
after alignment of transmitter.
t
A M
3
E
. - . .
TEST EQUIPMENT
Input of Spectrum analyzer or
harmonic meter to antenna jack.
TRANSMITTER A L I G N M E N T
Connect an RF wattmeter and 50-ohm, 25-watt dummy load to antenna connector.
NOTE: Be sure to check transmit frequency and power on all active channels after
alignment of transmitter.
See page 4 for channel frequencies.
SSB
TRUTH
(
TRANSCEIVER
Ch. 19, AM
C
H
A
14
N
E
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2
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4
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32
33
34
35
36
37
38
39
40
TEST EQUIPMENT
Inject a lOOOHz 5mV signal at
MIC input.
Inject a lOOOHz 200mV signal at
MIC input.
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ADJUST
L2 7
1 .
TRANSCEIVER
Ch. 19
Ch. 19
REMARKS
Adjust for MINIMUM at
54MHz.
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0
0
0
0
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0
1
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TRANSMITTER ADJUSTMENTS
Connect an RF wattmeter and 50-ohm, 25-watt dummy load to antenna connector.
NOTE: Be sure to check transmit frequency and power on all active channels
after adjustment of transmitter.
Connect an RF wattmeter and 50-ohm,
25-watt dummy load to antenna
connector.
L
ADJUST
L39,L37,L32,
L30,CT7
CT7
See page 4 for channel frequencies.
TEST EQUIPMENT
Input of DC meter to TPlO
(TR401, Emitter)
Connect current meter in series
with circuit at TP4.
No signal input.
Connect current meter in series
with circuit at TP2.
NO
signal input.
Connect an RF wattmeter and 50-
ohm, 25-watt dummy load to antenna
connector.
NO
signal input.
Inject a 1000Hz, 5mV signal at
MIC input.
Input of oscilloscope or modulation
meter to antenna jack.
REMARKS
Adjust for maximum.
Adjust for 12 watts.
Ch. 19, AM
'TRANSCEIVER
Ch. 19, AM
Ch. 19, AM
Ch. 19, USB
Ch. 19, USB
Ch. 19, USB
Ch. 19, AM
Ch. 19, AM
VR12
POWER METER
Adjust so that the POWER
meter reads just below the
red on the power scale of
meter.
ADJUST
RT301
VR17
VR15
VR16
VR4
VR8
VR6,VR7
REMARKS
VOLT REG
Adjust for 13.80 volts.
LED BRILLIANCE
Adjust so that channel LED
and clock display are the
same brightness.
BIAS
Adjust for 40mA.
BIAS
Adjust for 15mA.
BALANCE
Adjust for MINIMUM RF.
AM POWER
Adjust for 4 watts maximum.
MIC GAIN
&
AM AMC
Turn VR7(From top) fully
clockwise.
Adjust VR6 for 50% modula-
tion.
Increase audio to 200mV.
Adjust VR7 for 100% modula-
tion maximum.