Cobra Electronics Corporation PR4000WX User Manual
Customer Assistance
Warranty
Introduction
25
Nothing comes close to a Cobra
™
Operation
General Specifications
•
Nominal
Unit
Nominal
Unit
C. Transmitter
1. Conducted Power
GMRS . . . . . . . . . . . . . . . . . . . .W
3
FRS Only . . . . . . . . . . . . . . . . .mW
500
2. Carrier Frequency Stability . . . ±Hz
500
3. Modulation Limiting . . . . . . . . KHz
2.5
4. Carrier Attack Time . . . . . . . . . mS
80
5. Audio Frequency Response
@ 300 HZ . . . . . . . . . . . . . . . . . dB
-12
@ 2500 HZ . . . . . . . . . . . . . . . . dB
+6
6. Audio Distortion . . . . . . . . . . . . %
3
7. Hum Noise . . . . . . . . . . . . . . . . dB
30
8. Transient Frequency Behavior
a) TX On . . . . . . . . . . . . . . . . . mS
30
b) TX Off . . . . . . . . . . . . . . . . . mS
5
A. FRS/GMRS
Frequency
Allocation and
Compatibility
Allocation and
Compatibility
Important: Please note that Cobra
®
GMRS
models with 15 channels may designate
different channel numbers for the same
frequency. For example, a Cobra
different channel numbers for the same
frequency. For example, a Cobra
®
15 channel
GMRS model would need to be tuned to
channel 11 in order to communicate with
a 22 channel GMRS tuned to channel 15.
Please refer to the chart below for channel/
frequency number compatibility.
channel 11 in order to communicate with
a 22 channel GMRS tuned to channel 15.
Please refer to the chart below for channel/
frequency number compatibility.
A = 22 Channel GMRS
Channel No. Displayed
B = Channel No. For 15
Channel GMRS Models
C = Type of Radio Service
D = Frequency in MHz
E = Power in Watts ERP
D = Frequency in MHz
E = Power in Watts ERP
a = 3.0/2.0/0.5 (selectable)
b = 0.5
b = 0.5
A
B
C
D
E
1 1 FRS/GMRS 462.5625 a
2 2
2 2
FRS/GMRS
462.5875 a
3 3
FRS/GMRS 462.6125 a
4 4 FRS/GMRS 462.6375 a
5 5 FRS/GMRS 462.6625 a
6 6 FRS/GMRS 462.6875 a
7 7 FRS/GMRS 462.7125 a
8 FRS
5 5 FRS/GMRS 462.6625 a
6 6 FRS/GMRS 462.6875 a
7 7 FRS/GMRS 462.7125 a
8 FRS
467.5625
b
9 FRS
467.5875
b
10 FRS
467.6125
b
11 FRS
467.6375
b
12 FRS
467.6625
b
13 FRS
467.6875
b
14 FRS
467.7125
b
15 11 GMRS
462.5500
a
16 8 GMRS
462.5750 a
17 12 GMRS
462.6000
a
18 9 GMRS
462.6250 a
19 13 GMRS
462.6500
a
20 10 GMRS
462.6750
a
21 14 GMRS
462.7000
a
22 15 GMRS
462.7250
a
B. Receiver
1. Sensitivity
For 12 DB SINAD . . . . . . . . . . dBm
-121
For Call Signal Detection . . . . dBm
-121
2. Max. Audio Output
@10% THD . . . . . . . . . . . . . . . mW
200
3. Max. S/N Ratio
@ 1mV RF Input . . . . . . . . . . . dB
50
4. Squelch
a) Sensitivity . . . . . . . . . . . . . . dBm
-121
b) Attack Time . . . . . . . . . . . . . mS
150
c) Closing Time . . . . . . . . . . . . mS
200
5. Audio Frequency Response
@ 300 HZ . . . . . . . . . . . . . . . . . dB
-3
@ 2500 HZ . . . . . . . . . . . . . . . . dB
-10
6. Signal Displacement BW . . . +/-KHz
5
7. Adjacent Channel Rejection . . . dB
60
8. Intermodulation Rejection . . . . dB
65
9. Spurious Response Rejection . dB
55
D. Power Supply
1. Battery Life (5:5:90 RATIO)
With Alkaline Batteries . . . . . . . HR
24
2. Battery Operating Range . . . . . . V
4.2 - 6.0
Nominal
Unit