Realistic TRC-457 User manual

NOTE
Kepair or adjustment of trancn~ittrrci1.1uit~must 1,e under
supervision
01' a person wit11 first-or second-cla\s ratliotele-
phone licetlse.
(Kel'er to T<:<; Rules ntltl Regul;~tioll\ I'art 95, Subpart
c & D.)
The frequency or the transmitter should he checked periodically
with
a seconda~yrrequency sti~~ldai~l111 II:\LII-c ploper and legal
oper-ation.
Best I-esults hill be obtained when adjusting llle !inal RF outpu~
circuit if the antenna normally LISC~ 15 connecte~land thc chassia
is as nearly in the c;lblnet :I? posslhle.
Collnect rithel- iO-ol~rn clumm> Io,>d or the normally LISC~ antenna
system.
MODEL TRC-457
GENERAL:
Channels
: 40 Channels for AM, Upper Side Band and Lower Side Band,
utilizing Digital Circuitry
Frequency Range
: 26.965 MHz to 27.405 MHz
Frequency Control
: Digital (Phase Lock Loop)Synthesizer
Frequency Accuracy
: *I00 Hz
Operating Temperature Range
: -20°C to +50"C
Power Requirements
: 13.8V DC (12-16 volts DC, negative or positive ground) or
120V AC (60 Hz)
Antenna
Microphone
Speaker
Clock
Size
Weight
Accessories
: 52 ohm (Coaxial connector)
: 600 ohm Dynamic Type
: 8 ohm, 2.5 Watt
: Digital Type (solid state)
:4"x 15"x 11-112'' (HWD) (lox38x 29.2cm [HWDI)
: 16 Ibs. (approx.) (7.3 kg)
: AC Cord. DC Cord with in-line Fuse, Microphone and Micro-
phone Hanger and Mounting Brackets
MEASUREMENT CONDITION:
Power Source
: 13.8V DC, 120V AC (60Hz)
Antenna Impedance
: 50ohms
Test Temperature
: 25°C
AM Modulation Frequency
: 1 kHz
SSB Modulation Frequency, Transmit
: Two tone: 500 Hz and 2400 Hz
Single tone: 1 kHz
Mean Signal Input Level
: 1OOOpV
Reference Audio Output Power
: 0.5W
Reference AM Modulation Percentage
: 1 kHz 30%
Audio Frequency, SSB Receive
: 1 kHz
Audio Output Load
: 8 ohms resistive
Measuring Channel
: 19 Courtesy of the Manufacturer
HOWARD W. SAMS &
CO., 1 NC. Indianapolis, Indiana 46206
@ 1978 Howard W. Sams & Co., Inc.
Printed in U. S. of America 8CF829

ALIGNMENT INSTRUCTIONS
CAUTION: Use isolation transformer or observe polarity when connecting test equipment.
Maintain line voltage at 120V
AC.
Allow a 15-minute warm-up period.
Adjustments made with 13.8 volts at TPlO (TR401, Emitter).
Connect low sides of test equipment to ground unless specified otherwise.
Connect 50-ohm dummy load or antenna before keying transmitter.
Suggested Alignment Tools:
GC ELECTRONICS
.................
CT1 thru CT7. .8276, 5000
.................
L27, L30, L32 .9091, 8728-A, 8728
L1 thru L8, L16, L17, L24, L37, L39 ...... .9440
RECElVEl
Connect z
Adjust vc
Set gene]
RF GAIN h
r
Inject a
MIC inpul
Input of
Output oi
.OluF to
7.8MHz, I
Output oi
.OluF to
27.185MHi
SYNTHESIZER ALIGNMENT
TEST EQUIPMENT
Input of frequency counter thru
47pF to TPll(IC7, pin 10).
Input of oscilloscope to TP6.
Input of frequency counter to TP6.
Input of
DC meter to TP7.
Input of oscilloscope to TP8.
Input of frequency counter to TP8.
Input of frequency counter to
TP12 (TR31 collector).
Input of frequency counter to TP9.
Input of frequency counter to
antenna jack.
TRANSCEIVER
Ch. 1, AM
Ch. I, AM
Ch. 1, AM, CLARIFIER,
Yidrange
31- 1, USB, CLARIFIER,
Vidrange
3. 1, LSB, CLARIFIER,
Yidrange
Ch. 1,
AM, CLARIFIER,
Vidrange
Ch. 19, AM, CLARIFIER,
Vidrange
:h. 1, AM, CLARIFIER,
Yidrange
:h. 1, USB, CLARIFIER,
ilidrange
:h. 1, LSB, CLARIFIER,
ilidrange
:h. 1, AM, CLARIFIER,
4idrange
:h. 1, USB
:h. 1, LSB
:h. 1, AM, XMT
ADJUST REMARKS
Check for 10.240MHz.
Adjust for maximum RF.
Adjust for 33.855MHz +20Hz.
Adjust for 33.8574MHz +20Hz,
Adjust for 33.8526MHz +20Hz.
Adjust for 2.00 volts.
Adjust for maximum RF.
Check for 34.765MHz.
Check all channels.
(See Truth Chart for
correct frequencies).
Check for 34.7675MHz.
Check all channels.
(See Truth Chart for
correct frequencies).
Check for 34.7625MHz.
Check all frequencies.
(See Truth Chart for
correct frequencies).
Check for .91OMHz.
Check all channels.
(See Truth Chart for
correct frequencies).
Adjust for 7.8025MHz ?Hz.
Adjust for 7.7975MHz ?Hz.
Adjust for 26.965MHz.
I
RECEIVE
Connect ,
Adjust vl
RF GAIN I
SSB
Output of
.OluF to
27.186MHz
Output .2
t
" l
RECElVEl
Connect ;
Adjust vc
RF GAIN )
r
Output oj
.OluF to
27.185MH;
modulatic
Output .:
Output oi
.OluF to
27.185MH;
Output 5(
Output oi
.OluF to
27.185MH~
Output 1C
Output oi
.OluF to
27.185MHz
Output 1C

maximum RF.
33.855MHz +20Hz.
!.00 volts.
I
laximum RF.
I
.765MHz.
annels ,
hart for
uencies)
.
7675MHz.
mnels.
iart for A
lencies) .
.7625MHz.
:quencies.
Lart for
~encies) .
OMHz .
nnels.
art for
encies)
.
RECEIVER ALIGNMENT
Connect an AC VWhI or AF wattmeter across speaker voice coil.
Adjust volume control to obtain a suitable indication.
Set generator output low enough to prevent AGC limiting.
RF GAIN Maximum, CLARIFIER 0, Squelch
MINIMUM, NB Off, ANL Off.
1 TEST EQUIPMENT ( TRANSCEIVER I ADJUST I REMARKS 1
--
Output of signal generator thru
.OluF to TP13 (FET1, G1)
7.8MHz, lOOOHz @ 30%modulation.
Output of signal generator thru
.OluF to antenna jack.
27.185MHz, lOOOHz @ 30% modulation
Inject a lOOpps, luSec signal at
MIC input.
Input of oscillosope to
TP5.
Ch. 19, AM
Ch. 19, AM
NB On
Adjust for maximum output.
Adjust for maximum output.
If necessary readjust L5,
L6, L7, and L8.
Adjust for maximum.
RECEIVER ALIGNMENT
Connect an AC VTVEl or AF wattmeter across speaker voice coil.
Adjust volume control to obtain a suitable indication.
RF
GAIN Maximum, Clarifier 0, Squelch MINIMUM, ANL Off, NB Off, Volume Maximum.
I I
SSB
TEST EQUIPMENT
Output of signal generator thru
.OluF to antenna jack.
27.186MHz no modulation.
Output .25uV.
TRANSCEIVER ADJUST REMARKS
Ch. 19, USB CT1
RECEIVER ADJUSTMENTS
Connect an AC VTVM or AF wattmeter across speaker voice coil.
Adjust volume control to obtain a suitable indication.
RF GAIN Maximum, Clarifier 0, Squelch MINIMUM,
NB Off, ANL Off.
TEST EQUIPMENT
1 TRANSCEIVER 1 ADJUST 1
REMARKS
Output of signal generator thru
. OluF to antenna jack.
27.185MHz, lOOOHz @ 30%
modulation.
Output .5uV.
Output of signal generator thru
.OluF to antenna jack.
27.185MHz, lOOOHz @ 30%modulation
Output 50uV.
Output of signal generator thru
.OluF to antenna jack.
27.185MIIz, lOOOHz @ 30%modulation
Output 1000uV.
Ch. 19, AM
VOLUME Maximum
Ch. 19,
AM
RF GAIN MINIMUM
SQUELCH Maximum
I
Ch. 19, AM
Squelch Maximum
Output 100uV.
Output of signal generator thru
,OluF to antenna jack.
27.185MHz, lOOOHz @ 30%modulation.
AM RX GAIN
Adjust for 2 volts audio.
Ch. 19,
AM
SQUELCH RANGE
Adjust so that squelch
just breaks.
SIGNAL METER
Adjust for 9 on SIGNAL
scale of meter.

lr
-
TRANSMITTER ALIGNMENT
-
,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 AM
3
E
. -..
TEST EQUIPMENT
Input of Spectrum analyzer or
harmonic meter to antenna jack.
TRANSMITTER ALIGNMENT
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
L
'1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
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.
-
ADJUST
L27
1.
TRANSCEIVER
Ch. 19
Ch. 19
REMARKS
Adjust for MINIMUM at
54MHz.
21
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
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.

1
01s.
nnel LED
are the
RF .
maximum.
fully
i modula-
200mV.
1% modula-
: POWER
,elow the
scale of
TRUTH CHART
C 1 = 4.90 Volts 0 = 0 Volts
H IC7
A PROGRAM DIVIDER
II
I4
E
L
'
21
2 0
50
81
101
13 1
151
161
181
211
231
241
271
291
31 1
331
351
371
391
13
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
16
0
0
0
0
0
1
0
0
0
0
1
0
0
0
10
0
0
34.765
34.775
34.785
34.805
34.815
34.825
34.835
34.855
34.865
34.875
34.885
34.905
34.915
34.925
34.935
34.955
34.965
34.975
34.985
35.005
35.015
35.025
35.055
35.035
35.045
35.065
35.075
35.085
35.095
35.105
35.115
35.125
35.135
35.145
35.155
35.165
35.175
35.185
35.195
35.205
15
0
1
0
0
1
0
0
0
1
0
0
0
1
1
0
0
1
PINS
17
101010001
1
3OlOlOOll
~01010101
1
601010111
701011011
0
910000001
0
1110000011
1210000101
0
1410000111
0
1
1710010001
1
1910010011
2010010101
1
2210010111
0
1
2510011001
2610100001
2810100011
0
3010100101
0
3210100111
0
3410101001
1
3610110001
1
3810110011
10
4010110101
20
1
10
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
14
-----------
1
10
0
1
1
0
0
1
1
0
0
10
0
1
0
0
1
0
18
0
0
0
0
0
0
0
0
1
0
10
1
1
1
1
1
1
34.7675
34.7775
34.7875
34.8075
34.8175
34.8275
34.8375
34.8575
34.8675
34.8775
34.8875
34.9075
34.9175
34.9275
34.9375
34.9575
34.9675
34.9775
34.9875
35.0075
35.0175
35.0275
35.0575
35.0375
35.0475
35.0675
35.0775
35.0875
35.0975
35.1075
35.1175
35.1275
35.1375
35.1475
35.1575
35.1675
35.1775
35.1875
35.1975
35.2075
34.7625
34.7725
34.7825
34.8025
34.8125
34.8225
34.8325
34.8525
34.8625
34.8725
34.8825
34.9025
34.91 25
34.9225
34.9325
34.9525
34.9625
34.9725
34.9825
35.0025
35.0125
35.0225
35.0525
35.0325
35.0425
35.0625
35.0725
35.0825
35.0925
35.1025
35.1125
35.1225
35.1325
35.1425
35.1525
35.1625
35.1725
35.1825
35.1925
35.2025
.910
.920
.930
.950
.960
.970
.980
1 .OOO
1.010
1.020
1.030
1.050
1.060
1.070
1.080
1
.I00
1.110
1.I20
1.130
1.150
1.I60
1.I70
1.200
1.I80
1.190
1.210
1.220
1.230
1.240
1.250
1.260
1.270
1.280
1.290
1.300
1.310
1.320
1.330
1.340
1.350

!% Located on bottom d
chassis
,CHASSIS - TOP (TRC-457)

@ @@ @ @
a 33 338 333
\ \\ \it t\\ 'I?? ?Sa 7

IMAIN BOARD I

A Howard W. Sams I!! ' Photo
MAIIU BOARD

MAIN BOARD (TRC-457)