NOTE
Kepair or
adjustment
of
trancn~ittrr ci1.1 uit~ 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~y rrequency sti~~ldai~l 111
II:\LII-c
ploper and legal
oper-at ion.
Best
I-esults
hill
be obtained when adjusting llle !inal
RF
outpu~
circuit
if
the antenna normally
LISC~
15
connecte~l and 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) (lox 38x 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 (60 Hz)
Antenna Impedance
:
50 ohms
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
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