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25 WX NW ST Manual 3.3
6/15/99 1:10 PM
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.
CB
Channel In MHz
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
30
Page 30
Channel
Channel
Weather
Freq.
CB
Freq.
Weather Freq.
Channel In MHz
Channel In MHz.
26.965 21
27.215 1
162.400
26.975 22
27.225 2
162.425
26.985 23
27.255 3
162.450
27.005 24
27.235 4
162.475
27.015 25
27.245 5
162.500
6
162.525
27.025 26
27.265 7
162.550
27.035 27
27.275
27.055 28
27.285
27.065 29
27.295
27.075 30
27.305
27.085 31
27.315
27.105 32
27.325
27.115 33
27.335
27.125 34
27.345
27.135 35
27.355
27.155 36
27.365
27.165 37
27.375
27.175 38
27.385
27.185 39
27.395
27.205 40
27.405
25 WX NW ST Specifications
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)
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