Cb Transmitter Portion; Cb Receiver Portion; Weather Radio Section - Radio Shack TRC-447 Service Manual

CB TRANSMITTER PORTION

Item
Frequency tolerance
RF Power output
AMC range
Modulation frequency response Lower frequency
Microphone sensitivity
Modulation distortion
Battery drain
RF Power output at 12 V
Modulation attack time
Modulation release time

CB RECEIVER PORTION

Maximum sensitivity
Sensitivity for 10 dB S/N
AGC Figure of merit 50 mV for 10 dB change in audio output
Threshould squelch sensitivity
Tight squelch sensitivity
Adjacent channel selectivity at ±10 kHz
Spurious rejection ratio
Image rejection ratio (−910 kHz)
IF rejection ratio
Audio output power
Audio frequency response
THD at 500 mW audio output
Signal to noise ratio at 1mV
Oscillator on voltage
Battery drain
RF gain control range at 1 µV reference
S-meter sensitivity at S-9

WEATHER RADIO SECTION

Sensitivity at 2.0 µV Input
THD at 500 mW audio output
Input 1 mV ±3 kHz deviation
Signal to noise ratio at 1 mV
Audio output power
Digital weather alert sensitivity
Input SAME data (FSK) ±4.5 kHz dev.
25 °C 13.8 V
50% to 100% modulation
Upper frequency
1 kHz, 50% Mod.
1 kHz, 80% Mod.
at No modulation
at 80% modulation
10.695 MHz
455 kHz
Maximum
10% Distortion
Lower frequency
Upper frequency
1 mV 30% input
at No signal
at Maximum AF output
Maximum
10% Distortion
Unit
Hz
W
dB
450 Hz dB
2500 Hz dB
mV
%
mA
mA
W
mSec
mSec
µV
µV
dB
µV
µV
dB
dB
dB
dB
dB
8-ohm W
8-ohm W
450 Hz dB
2500 Hz dB
%
dB
V
mA
mA
dB
µV
dB SINAD
%
dB
8-ohm W
8-ohm W
µV
— 3 —
Nominal Limit
±200 ±1300
−
45 35
−3 −10
−3 −10
4 10
3
900 1300
1300 1900
2.7 2.2
100 300
800 500
0.5
0.5
90 75
0.5
1000 250 ~ 4000
50 40
45 30
65 55
60 50
90 60
5.5 4.0
4.0 3.5
−3
-10
−3
-10
3
40 35
5 11
300 350
1000 1500
30 20
100 50 ~ 200
27 15
3
45 35
5.5
4 3.5
0.5 1.0
4
8
1
1
1
5
7
4