Cobra 25wxnwst Manual De Usuario

25 WX NW ST Specifications

Frequency Ranges

The COBRA 25 WX NW ST transceiver represents
one of the most advanced AM two-way radios used
as a Class D station in the Citizens Radio Service.
This unit features advanced Phase Lock Loop (PLL) 
circuitry providing complete coverage of all 40 CB
channels.

1

26.965 21

27.215 1

162.400

2

26.975 22

27.225 2

162.425

3

26.985 23

27.255 3

162.450

4

27.005 24

27.235 4

162.475

5

27.015 25

27.245 5

162.500

6

162.525

6

27.025 26

27.265 7

162.550

7

27.035 27

27.275

8

27.055 28

27.285

9

27.065 29

27.295

10

27.075 30

27.305

11

27.085 31

27.315

12

27.105 32

27.325

13

27.115 33

27.335

14

27.125 34

27.345

15

27.135 35

27.355

16

27.155 36

27.365

17

27.165 37

27.375

18

27.175 38

27.385

19

27.185 39

27.395

20

27.205 40

27.405

GENERAL
CHANNELS . . . . . . . . . . . . . . . . . . . . . . . CB - 40 CH 
FREQUENCY RANGE. . . . . . . . . . . . . . . CB - 26.965 TO 27.405 MHZ

WX - 162.400 TO 162.550 MHZ

FREQUENCY TOLERANCE . . . . . . . . . . 0.005 %
FREQUENCY CONTROL . . . . . . . . . . . . PLL (PHASE LOCK LOOP) SYNTHESIZER
OPERATING TEMPERATURE 
RANGE. . . . . . . . . . . . . . . . . . . . . . . . . . . -30° C TO + 50° C
MICROPHONE . . . . . . . . . . . . . . . . . . . . PLUG-IN DYNAMIC
INPUT VOLTAGE  . . . . . . . . . . . . . . . . . . 13.8VDC nom.(positive or negative ground) 
CURRENT DRAIN

TRANSMIT: AM FULL MOD.,1.5A (MAXIMUM) 
RECEIVE:SQUELCHED, 0.3A;
FULL AUDIO OUTPUT, 1.2A (NOMINAL)

SIZE  . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-5/8”D X 6-3/8”W X 2-13/64” H
WEIGHT . . . . . . . . . . . . . . . . . . . . . . . . . .4 LBS.
ANTENNA CONNECTOR . . . . . . . . . . . .UHF; SO-239
METER  . . . . . . . . . . . . . . . . . . . . . . . . . . .ILLUMINATED;INDICATES RELATIVE

POWER OUTPUT AND RECEIVED 
SIGNAL STRENGTH

TRANSMITTER
POWER OUTPUT . . . . . . . . . . . . . . . . . .4 WATTS
MODULATION  . . . . . . . . . . . . . . . . . . . .AM (AMPLITUDE MODULATION)
FREQUENCY RESPONSE . . . . . . . . . . . .300 TO 3000 HZ
OUTPUT IMPEDANCE . . . . . . . . . . . . . .50 OHMS,UNBALANCED

RECEIVER
SENSITIVITY . . . . . . . . . . . . . . . . . . . . . . .LESS THAN 1  µV FOR 10 dB (S+N) /N
SELECTIVITY  . . . . . . . . . . . . . . . . . . . . . .6 DB @ 7 KHZ,60 dB @ 10KHZ
IMAGE REJECTION . . . . . . . . . . . . . . . . .80 dB, TYPICAL
ADJACENT-CHANNEL REJECTION . . .60 dB, TYPICAL
IF FREQUENCIES  . . . . . . . . . . . . . . . . . .DOUBLE CONVERSION:1ST: 10.695 MHZ 

2ND:455 KHZ

AUTOMATIC GAIN CONTROL (AGC) .LESS THAN 10 dB CHANGE IN AUDIO

OUTPUT FOR INPUTS FROM 10 TO 50,000 
MICROVOLTS

RF GAIN RANGE . . . . . . . . . . . . . . . . . . .40 dB
NOISE BLANKER . . . . . . . . . . . . . . . . . . .RF TYPE
SQUELCH . . . . . . . . . . . . . . . . . . . . . . . . .A D J U S TA B L E ;THRESHOLD LESS THAN 1µV
AUDIO OUTPUT POWER  . . . . . . . . . . .4 WATTS
FREQUENCY RESPONSE . . . . . . . . . . . .300 TO 3000 HZ
DISTORTION . . . . . . . . . . . . . . . . . . . . . .LESS THAN 7% @3 WATTS @ 1000 HZ
BUILT-IN SPEAKER . . . . . . . . . . . . . . . . .8 OHMS,5W
E XTERNAL SPEAKER (NOT SUPPLIED) 8 OHMS; DISABLES INTERNAL SPEAKER 

WHEN CONNECTED

PA SYSTEM
POWER OUTPUT . . . . . . . . . . . . . . . . . .4 WATTS INTO EXTERNAL SPEAKER
EXTERNAL SPEAKER FOR PA . . . . . . . .8 OHMS, 4 WATTS MIN.
(NOT  SUPPLIED) . . . . . . . . . . . . . . . . . .THE PA SPEAKER ALSO MONITORS THE

RECEIVER;SEPAR ATE JACK PROVIDED

Weather
SENSITIVITY . . . . . . . . . . . . . . . . . . . . . . .LESS THAN 1 uV FOR 12 dB SINAD
IF FREQUENCY . . . . . . . . . . . . . . . . . . . .DUAL CONVERSION 

1st: - 10.690 MHz
2nd: - 455 KHz

AUDIO OUTPUT . . . . . . . . . . . . . . . . . . .MAXIMUM 500 mW AT 10% DISTORTION 
FREQUENCY RESPONSE . . . . . . . . . . . .300 - 3000 HZ AT -6dB

(SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE)

25 WX NW ST Manual 3.3  6/15/99 1:10 PM  Page 30