Cobra 19ULTII Operating instructions

Cobra Electronics Corporation
6500 W. Cortland Street
Chicago, IL 60707
place
stamp
here
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PRINTED IN THAILAND ©COBRA ELECTRONICS CORP. 1997 480-192-P-001
This device complies with Part 15 of the F.C.C. rules.
Operation is subject to the following conditions:
(1) This device may not cause harmful interference and
(2) This device must accept any interference received,
including interference that may cause undesired operation.
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40 CHANNEL
HOW TO USE YOUR
CITIZENS BAND
2-WAY MOBILE RADIO
WITH INSTANT EMERGENCY CHANNEL 9
MODEL
19 ULTRA
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CITIZENS BAND
2-WAY MOBILE RADIO
HOW TO USE YOUR
40 CHANNEL
MODEL
Contents Page
The CB Story ..................................................................................................1
Introduction
Frequency Range........................................................................................2
Specifications ..................................................................................................3
Installation
Location ......................................................................................................4
Mounting and Connections ..................................................................4-5
CB Antenna ................................................................................................6
Ignition Noise Interference ......................................................................7
Operation
Controls and Indicators....................................................................8-9-10
Operating Procedure to Receive ............................................................11
Operating Procedure to Transmit ..........................................................11
Maintenance and Adjustment ....................................................................12
Appendix
Ten Code....................................................................................................13
A Few Rules That Should Be Obeyed ..................................................14
How Your CB Can Serve You ................................................................14
Use Channel 9 for Emergency Messages Only....................................15
If You Need Service......................................................................................16
Limited Two Year Warranty ......................................................................17
Accessories ..........................................................................Inside Back Page
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The CB Story
1
The Citizens Band lies between the shortwave broadcast and 10-meter
Amateur radio bands, and was established by law in 1949. The Class D
two-way communications service was opened in 1959. (CB also in-
cludes a Class A citizens band and Class C remote control frequencies.)
FCC regulations permit only ÒtransmissionsÓ (one party to another)
rather than ÒbroadcastsÓ (to a wide audience). Thus, advertising is not
allowed on CB channels because this is Òbroadcasting.Ó
Replacement or substitution of transistors, regular diodes or
other parts of a unique nature, with parts other than those rec-
ommended by Cobra, may cause violation of the technical reg-
ulations of Part 95 of the FCC Rules, or violation of Type
Acceptance requirements of Part 2 of the Rules.
Citizens Band (CB) Radio operators are no longer required to
obtain an FCC license to operate their CB equipment or pro-
vide station identification.
Nevertheless, an operator of a CB radio station is still required
to comply with the communications act and with the rules of
CB Radio Operation.
Serial No.
Date of Purchase
Dealer Name
Keep this manual for detailed information
about your Cobra CB Radio System.
SAVE YOUR SALES RECEIPT, THE
CARTON AND “PACKING” FOR
POSSIBLE FUTURE USE.
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Frequency Range
Your COBRA CB radio provides high-level, trouble-free performance
over the following frequency assignments:
Channel Frequency Chann
Frequency
Channel in MHz Channel in MHz
1 26.965 21 27.215
2 26.975 22 27.225
3 26.985 23 27.255
4 27.005 24 27.235
5 27.015 25 27.245
6 27.025 26 27.265
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
These frequencies are generated and accurately controlled by a phase
lock hoop (PLL) circuit, comprised of the latest state-of-the-art integrat-
ed circuit technology, ensuring high reliability and excellent frequency
stability on the above channels.
To obtain maximum performance please read carefully the descrip-
tions and operating instructions in this manual.
Introduction
2
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Specifications
3
GENERAL
Channels 40.
Frequency Range 26.965 to 27.405 MHz.
Frequency Control Phase-Locked Loop (PLL) synthesizer.
Frequency Tolerance 0.005%
Operating Temp. Range -30¡C to +50¡C.
Microphone Plug-in type; Electret condenser.
Input Voltage 13.8V DC nom. (negative ground)
Current Drain Transmit: AM full mod., 1.5A (maximum).
Receive: (Squelched, 0.115A, full audio out-
put 1.0A (nominal).
Size 6-5/8ÓD x 4-9/16ÓW x 1-13/16ÓH
(165mm x 116 mm x 44 mm.)
Weight 3 lbs., 4 oz. (1.0 kg.).
Antenna Connector UHF, SO-239.
Semiconductors 22 transistors, 17 diodes, 3 integrated cir-
cuits, 7 LEDs.
Meter Indicates relative power output and
received signal strength.
TRANSMITTER
Power Output 4 watts.
Modulation High- and low-level Class B amplitude.
Frequency 300 to 3000 Hz.
Output Impedance 50 ohms, unbalanced.
Output Protection Output transistors protected against mis-
match up to 20:1
RECEIVER
Sensitivity Less than 1µV for 10dB(S + N)/N.
Selectivity 6 dB @ 7 KHz, 55dB @ 15 KHz.
Image Rejection 60 dB typical.
Adjacent CH. Rejection 50 dB, typical.
IF Frequencies Double conversion, 1st: 10.695 MHz.
2nd: 455 KHz.
Automatic Gain Control Less than 10dB change in audio output for
(AGC) inputs from 10 to 50,000µV
Squelch Adjustable; threshold less than 1µV.
Audio Output Power 3 watts.
Frequency Response 300-3000Hz.
Distortion Less than 10% @ 3 watts @ 1000 Hz.
Built-in Speaker 8 ohms, round.
External Speaker 8 ohms; disables internal speaker when
(Not Supplied) connected.
PA SYSTEM
Power Output 4 watts into external speaker.
External Speaker for PA 8 ohms; a separate jack is provided.
(Not Supplied)
(Specifications subject to change without notice.)
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Installation
Location
Plan the location of the transceiver and microphone bracket before start-
ing the installation. Select a location that is convenient for operation and
does not interfere with the driver or passengers in the vehicle. In auto-
mobiles, the transceiver is usually mounted to the underneath of the
dash panel, with the microphone bracket beside it.
Mounting Connection
The transceiver is held in the universal mounting bracket by two thumb
screws, permitting adjustment at the most convenient angle.
Auniversal mounting bracket is supplied along with self tapping
screws and star washers. The mounting must be mechanically strong
and also provide a good electrical connection to the chassis of the vehi-
cle. To mount the transceiver:
1. Determine the most convenient location in your vehicle. Hold the
COBRA radio with mounting bracket in the exact location desired. If
nothing will interfere with mounting it in the desired position,
remove the mounting bracket and use it as a template to mark the
location for the mounting screws.
2. Drill necessary holes and secure mounting bracket in location.
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5
Installation (Cont.)
3. Connect the antenna cable plug to the standard receptacle on the
unit. Most CB antennas are terminated with a type PL-259 plug
which mates with the receptacle marked ÒANT.Ó
4. Connect the red lead of DC power cord to +13.8VDC. In automo-
bile installations, +13.8VDC is usually obtained from the accessory
contact in the fuse box. This prevents the set being left on acciden-
tally and also permits operating the unit without the vehicleÕs
engine running.
Before installing the CB radio, visually check the vehicle battery
connections to determine which battery terminal, positive or neg-
ative (positive is the larger of the two) is grounded to the engine
block (or chassis).
5. Connect the black lead to the negative side of the automobile. This
is usually the chassis of the car. Any convenient location with good
electrical contact (remove paint) may be used.
6. Mount the microphone bracket on right side of the transceiver, or
near it using two screws supplied. When mounting in an automo-
bile, place the bracket under the dash so the microphone is readily
accessible.
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Installation (Cont.)
CB Antenna
Since the maximum allowable power output of the transmitter is limit-
ed by the FCC, the antenna is one important factor affecting transmis-
sion distance. Only a properly matched antenna system will allow max-
imum power transfer from the 50-ohm transmission line to the radiat-
ing element. In mobile installations (cars, trucks, boats, etc.), an anten-
na system that is non-directional should be used.
Avertically polarized, quarter-wavelength whip antenna provides the
most reliable operation and greatest range. The shorter, loaded-type
whip antennas are more attractive, compact and adequate for applica-
tions where the maximum possible distance is not required. Also, the
loaded whips do not present the problems of height imposed by a full
quarter-wavelength whip.
Mobile whip antennas utilize the metal body of the vehicle as a ground
plane. When mounted at a corner of the vehicle they are slightly direc-
tional, in the direction of the body of the vehicle. For all practical pur-
poses, however, the radiation pattern is nondirectional. The slight direc-
tional characteristic will be observed only at extreme distances. A stan-
dard antenna connector (type SO-239) is provided on the transceiver for
easy connection to a standard PL 259 cable termination. Cobra loaded-
type antenna models ATW-500, AT-55, ATW-1000 and ATW-400 are
highly recommended for most installations. Consult your Cobra dealer
for further details.
When installed in a boat, the transceiver will not operate at maximum
efficiency without a ground plate, unless the vessel has a steel hull.
Before installing the transceiver in a boat, consult your dealer for infor-
mation regarding an adequate grounding system and prevention of
electrolysis between fittings in the hull and water.
3-Way Combinations Antennas are available which allow operation
of all three bands (AM-FM & CB), using a single antenna. However,
use of this type of antenna usually results in less than normal trans-
mit and receive range when compared to a standard-type “Single
Band” antenna designed for CB only.
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