Cobra 148 GTL Support Question
Cobra 148 GTL Support Question
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Question posted by foxBradley180 on May 27th, 2014
148gtl Cobra Cb Ulock Voice Contorl For Ssb China Verion
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Related 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
... Serial No. How To Use Your
40-CHANNEL, CITIZENS BAND SSB/AM 2-WAY MOBILE RADIO
Model 148 GTL
Contents
Page
Section I: Introduction 2 Section II: Specifications 3, 4...CB radios
®
microTALK radios Radar/Laser Detectors
GPS Safety Alert® Traffic Warning Systems Accessories HighGear™ Accessories
If You Think You Need Service,
please contact your Cobra CB Radio System.
The Cobra...
148GTLE_Eng-Spa - Page 3
..., providing complete coverage of the most advanced SSB/AM two-way radios ever designed for use as a Class D station in the Citizens Radio Service. with push-to +50° ...). SSB 12 watts PEP output, 2A. UHF, S0239. 3 field effect transistors, 45 transistors, 63 diodes, 6 integrated circuits, 1 two color light emitting diode. Section I Introduction
FREQUENCY RANGE
The COBRA 148GTL transceiver...
148GTLE_Eng-Spa - Page 4
...COBRA 148GTL is readily accessible.
(SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE)
4
5 After you have determined the most ignition switches by tracing the power wire from 10 to +13.8V DC. Most CB... is supplied with a universal mounting bracket. SSB: 6 dB @ 1.1 KHz, 60 dB @ 2.3 KHz.
disables internal speaker when connected. When mounting the bracket and radio to 2500 Hz.
4 ohms, round.
...
148GTLE_Eng-Spa - Page 5
...at low signal levels is from the generator and ignition system in the vehicle. Even though the COBRA 148GTL has ANL and NB controls, in some installations ignition interference may come from several sources. Only a...signals are having difficulties in adjusting your COBRA dealer or a 2-way radio technician for information regarding an adequate grounding system and prevention of severe noise.
148GTLE_Eng-Spa - Page 6
...clockwise to apply power to
the unit and to be received must overcome in your COBRA 148GTL. F. EXTERNAL SPEAKER
The external speaker jack (EXT SPK) on the front panel of the RF amplifier under... strong signal conditions.
8
9 During normal CB operation, the Volume control is used to be heard at the transceiver speaker or the...
148GTLE_Eng-Spa - Page 7
... with the high audio output level available from the COBRA 148GTL. If the public address feature is recommended. The ... audio response to "Receiving SSB signals" for a given sound level from the microphone. VOICE LOCK. In the ANL position...9 may also be in the Operating Procedure paragraphs.
7. In the CB position, the PA function is connected. A directional type outdoor speaker ...
148GTLE_Eng-Spa - Page 8
...voice". Adjust the VOICE LOCK control to clarify the SSB signals or to the RF output power.
3. Select the desired channel of the SSB...signal should be in the USB position. The radio comes complete with 100% of transmission.
2....is located next to operate on COBRA 148GTL.
3. RECEIVE/TRANSMIT INDICATOR. ...applied to 80 SSB channels. Set the CHANNEL selector switch to the CB position and ...
148GTLE_Eng-Spa - Page 9
...direction (opposite sideband) no amount of speed control (VOICE LOCK) will hear the increase in the output tone of the received signal.
Cobra 148GTL microphone schematic. All leads should select a low-impedance .... Thus when a voice is tuned to the intelligence, unless the SSB receiver is used in place of a whistle or tone, in the proper listening mode the voice will produce a steady...
148GTLE_Eng-Spa - Page 11
...Maintenance and Adjustment
The COBRA 148GTL transceiver is specifically designed for us? If a problem still exists, please contact your local dealer.
18
Section VI Appendix
Citizens Band radio operators have a ..., message received Relay message Busy, stand by Completed last assignment Can you a radio check EMERGENCY TRAFFIC Trouble at this channel 10-94 Please give you contact Disregard...
148GTLE_Eng-Spa - Page 12
...carry on Channel 9. You may not use on a conversation with another station for use your CB. 6. Section VI Appendix (Continued)
USE CHANNEL 9 FOR EMERGENCY MESSAGES ONLY
FCC gives the...quiet here."
20
21 No tornado sighted."
Everything is Halloween patrol unit number 3. HOW YOUR CB CAN SERVE YOU
• Warn of 6th and Main Streets."
These are guidelines and are ...
Circuit Diagram - Page 2
...114,119,123,124,126,
131,132,142,145,148,
149,152,154,157,161,
203
R-39,98...-9-001
Resistor, Variable, RV-139, 20K ohm VOICE LOCK Resistor, Variable,RV-319, 1K ohm A...SW-067, NB/ANL
Switch, Rotary, SW-056, PA-CB, DIM, TONE
Speaker, SP-050
Meter, MT-158
Microphone...164-9-001
CIRCUIT SYMBOL
• DESCRIPTION _... BILL OF MATERIAL FOR COBRA 148GTL
CIRCUIT SYMBOL
IC-1 IC-2 IC-3 IC-4 - R-21,105...
Circuit Diagram - Page 3
... SW
Switch, Rotary, SR-205, MODE/METER
Switch, Rotary, SW-067, NB/ANL
Switch, Rotary, SW-056, PA-CB, DIM, TONE
Speaker, SP-050
Meter, MT-158
Microphone, MK-091
Jack, Antenna, JK-068
Jack, Microphone, JK-...16,19,22,23,
32,49,53,66,78,89,93,
114,119,123,124,126,
131,132,142,145,148,
149,152,154,157,161,
203
R-39,98
R-128
Resistor, Carbon.Film, Resistor, Carbon Film, Resistor, Carbon ...
Circuit Diagram - Page 1
...L30
431
R2.24
A211
3.3K
432 7001 -
. 1 .3
66121 .474 CI 5
TR47 A126606
8203 10K
TR34 C31047
c137 2-2u
RXY SSB A LC
/770 D42
10KB
R6DKS
V00 D".
/77
8.30(2K)
TR44 L46550
470
1646 LC945
0.37(TX)
671 0470
R157 10K
R104
..._,1 591
N 4 01.1M/3W ...
50402 OH/OFF
/77 14.!:
05
12401 .022u c
i1001 0402 =OP
_ 04ail
TITLE:
148GTL-ST CIRCUIT DIAGRAM FOR COBRA
PREPARED: S K.CNEUNG
-
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