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Popular Cobra 148 GTL Manual Pages
148GTLE_Eng-Spa - Page 1
OPERATING INSTRUCTIONS FOR YOUR
40 CHANNEL
CITIZENS BAND SSB/AM 2-WAY MOBILE RADIO
Model 148 GTL
Nothing comes close to a Cobra™
PRINTED IN CHINA
©2002 COBRA ELECTRONICS CORPORATION 6500 WEST CORTLAND STREET CHICAGO, IL 60707 USA
480-046-P
148GTLE_Eng-Spa - Page 2
...CHANNEL, CITIZENS BAND SSB/AM 2-WAY MOBILE RADIO
Model 148 GTL
Contents
Page
Section I: Introduction 2 Section II: Specifications 3, 4 Section III: Installation 5, 6, 7, 8 Section IV: Operation 9-17 Controls and Indicators 9 A.Control Functions 9, 10, 11 B.Indicator Functions 12 Operating Procedure to Receive 12 Operating Procedure to Transmit 13 Receiving SSB Signals 13, 14 Alternate...
148GTLE_Eng-Spa - Page 3
... Radio Service. AM and SSB; 300 to +50° C). Meter shows relative RF output power and SWR.
SSB 12 watts PEP output, 2A. SSB: 3rd order, more than -25 dB. 5th order, more than -35 dB. 55 dB. 50 dB. To obtain maximum performance please read carefully the descriptions and operating instructions in this manual...
148GTLE_Eng-Spa - Page 4
.... In automobiles, the transceiver is readily accessible.
(SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE)
4
5 MOUNTING THE CONNECTION
The COBRA 148GTL is mechanically strong. When mounting the bracket and radio to the chassis of the mounting bolts.
2. After you have determined the most ignition switches by tracing the power wire from the rear panel. Before drilling the...
148GTLE_Eng-Spa - Page 5
... will show a lower reading each time the antenna is adequate, the background noise does not present a serious problem.
When installed in 1/8" increments until a good match is obtained. 2. Set your antenna, check the following:
A. B. B. Also, when extremely low level signals are slightly directional, in adjusting your COBRA 148GTL to a standard PL 259 cable termination. The...
148GTLE_Eng-Spa - Page 6
...COBRA 148GTL will operate into an SWR of 2 to the point...power to
the unit and to reduce the gain of the microphone and speaker is used to handle at a maximum clockwise setting. 3. During normal CB...ohm speaker (4 watts minimum) to adjust the output level obtained either at rated... COBRA 148GTL. Is the antenna perfectly vertical? Direct speaker away from large metal
objects when adjusting ...
148GTLE_Eng-Spa - Page 7
... on the meter face. This switch is available several inches away from the COBRA 148GTL. Channel 9 has been reserved by adjusting the "SWR" control to achieve maximum radiated power and the longest range, it may also be advisable.
5. When transmitting, the meter indicates relative RF output power. Turn to optimize AM signals as described in the...
148GTLE_Eng-Spa - Page 8
...ALTERNATE MICROPHONES AND INSTALLATION section. Section IV Operation (Continued)
B. Swings proportionally to the RF output power.
3. SWR METER. The receiver/transmit LED indicator is now properly adjusted. Press the switch and the transmitter is transmitted. The radio comes complete with 100% of whistles and tones heard on .
5. Set the VOLUME for the SWR measurement (Note: CB must be...
148GTLE_Eng-Spa - Page 9
...1. Section IV Operation (Continued)
ALTERNATE MICROPHONES AND INSTALLATION
For best results, the user should be low... plug is set too high, voices will be high-pitched and if set too low,... the desired SSB mode has been selected, frequency adjustment may be revised as a phonograph speed control. ...Transmit Control
4
Receive Control
Fig. 1.
Cobra 148GTL microphone schematic.
148GTLE_Eng-Spa - Page 11
..., however, replace parts only with transmission
in high reliability. Refer to 10-64 Net clear 10-65 Awaiting your local dealer.
18
Section VI Appendix
Citizens Band radio operators have a message for standard questions and answers. NOTE If the performance described in mobile installations. Section V Maintenance and Adjustment
The COBRA 148GTL transceiver is specifically designed for...
148GTLE_Eng-Spa - Page 12
...others a chance to sell merchandise or professional service. You are not allowed to carry on...the air by over-powering them with your office or home. • Make friends for more interesting, and help fast in your CB to use your CB. 6.
Everything is ... amplified transmitter power, or illegally high antennas. 3.
Section VI Appendix (Continued)
A FEW RULES THAT SHOULD BE OBEYED 1.
Circuit Diagram - Page 2
...35,54 R-80 R-206 R-13 FI-85,127
Resistor, Carbon Film,... 089
Terminal, Test Point, TP-019'
Terminal, Test Point, TP-027
Terminal, Test Point, TP-020
Fuse...CB, DIM, TONE
Speaker, SP-050
Meter, MT-158
Microphone, MK-091
Jack, Antenna...,126,
131,132,142,145,148,
149,152,154,157,161,... PART NO.
• 634-051-9-001 • 634-088-9-002
634-099-9-001 • BILL OF MATERIAL FOR COBRA 148GTL
...
Circuit Diagram - Page 3
...PART...Instruction Manual
Circuit Diagram/Bill of Material
Warranty Card
Service Station Card
FCC Form 505
FCC Form 555-B •
FCC Rules Part 95
DYNASCAN PART...145,148,...±5% ±5% ±5% ±5%
+5% .5%
DYNASCAN PART NO.
'002-108-5-392 002-108-5-472 002-108-5-103 ...)
DYNASCAN PART NO. ...148...DC Power,...PART...CB, DIM, TONE
Speaker, SP-050
Meter, MT-158
Microphone, MK-091
Jack, Antenna...
Circuit Diagram - Page 1
...Es
226 23111
1 11?:
34MHZ
▪ 1 248H2
113903 7505
"1401/
10F5-
DRIVER
0182. 1.20
0159 47007
swg
SWR
5124031A
S/RF/SWR METER
Rota: %Rolston. ...564030
5444-044 PA
0170 10009
• • 777
0170 AUDIO 220P POWER
AMP ICS 01572174f
R195 47
0150 el 33u
TR43 comma
0183 0301 .11, ... c
i1001 0402 =OP
_ 04ail
TITLE:
148GTL-ST CIRCUIT DIAGRAM FOR COBRA
PREPARED: S K.CNEUNG
-
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