Cobra 148 GTL Support Question
Cobra 148 GTL Support Question
Find answers below for this question about Cobra 148 GTL.Need a Cobra 148 GTL manual? We have 3 online manuals for this item!
Question posted by bluesdaddy317 on October 20th, 2021
Tune Up For A Cobra 148 Gtl
What pods on a Cobra 148 gtl adjust the wattage and modulation
Current Answers
Answer #1: Posted by SonuKumar on October 20th, 2021 8:25 AM
SonuKumar
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https://www.youtube.com/watch?v=LJrDkh7FY7A
https://www.youtube.com/watch?v=kaPEQc4dOZw&t=42
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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
... 2-WAY MOBILE RADIO
Model 148 GTL
Contents
Page
Section...Adjustment 18-21 Section VI: Appendix 19, 20, 21 Ten Code ...19 A few Rules That Should Be Obeyed 20 How Your CB Can Serve You 20 Use Channel 9 for detailed information about your local dealer. Date of quality products includes: CB radios
®
microTALK radios...contact your Cobra CB Radio System.
Serial No.
The Cobra® ...
148GTLE_Eng-Spa - Page 3
... coverage of the most advanced SSB/AM two-way radios ever designed for use as a Class D station in operation.
3 Section I Introduction
FREQUENCY RANGE
The COBRA 148GTL transceiver represents one of all 40 channels shown below. Illuminated; The receiver also features increased protection against cross modulation and strong adjacent channel signals.
UHF, S0239. 3 field...
148GTLE_Eng-Spa - Page 4
...radio to the standard receptacle on either side of audio output. Connect the antenna cable plug to your vehicle, hold the COBRA...by tracing the power wire from the rear panel. Most CB antennas are terminated with a type PL-259 plug and ...the rear panel.
SSB: 7.8 MHz.
60 dB AM & 70 dB SSB.
40 dB adjustable for optimum signal reception. Connect the black lead to 2500 Hz.
4 ohms, round.
...
148GTLE_Eng-Spa - Page 5
... be lightly tapped with adjustable screws (set screw lightly enough so that you are slightly directional, in the hull and water.
6
Section III Installation (Continued)
TUNING THE ANTENNA FOR OPTIMUM ... vehicle as once it is one time, as a ground plane. Set your COBRA dealer or a 2-way radio technician for Channel 21.
Be very careful not to a good metal electrical ground...
148GTLE_Eng-Spa - Page 6
... internal speaker is important when operating the PA at high output levels. During normal CB operation, the Volume control is used for a maximum of the microphone and speaker is... ohms impedance and be able to be received must overcome in your COBRA 148GTL. Direct speaker away from large metal
objects when adjusting (metal telephone or light posts, fences, etc.). Section III Installation...
148GTLE_Eng-Spa - Page 7
...antenna output connector. Generally speaking, readings up to tune in the ANL + NB position, the RF noise blanker also is activated. Adjusts the microphone gain in "SWR" position, the standing...antenna condition. Section IV Operation (Continued)
10. In the CB position, the PA function is available several inches away from the COBRA 148GTL. This controls the gain to the operator's preference....
148GTLE_Eng-Spa - Page 8
... far, or some of tuning will make even moderately strong...for the SWR measurement (Note: CB must be made intelligible only if ...the desired channel of modulation will detect upper sideband...the SSB signal. The radio comes complete with 100% ...to the "CAL" mark on COBRA 148GTL.
3. INDICATOR FUNCTIONS
1. An...until a signal is now properly adjusted. A singlesideband transmitted signal consists only...
148GTLE_Eng-Spa - Page 9
... resultant tone from the receiver. Also, there is tuned to an AM transmission, a correct sideband is set... Control
Fig. 1. If the record is high or low pitched, adjust the operation of speed control (VOICE LOCK) will cause a decrease in...)
pitched whistle or a high-pitched whistle) you select.
Cobra 148GTL microphone schematic. Transistorized type microphones have a low output impedance...
148GTLE_Eng-Spa - Page 11
...base My location is Call by telephone Report in mobile installations. Nothing for you a radio check EMERGENCY TRAFFIC Trouble at this channel 10-94 Please give me a long
count ... and MAINTENANCE AND ADJUSTMENT sections is not obtained, review the operating instructions to insure that proper procedures were followed. Section V Maintenance and Adjustment
The COBRA 148GTL transceiver is specifically...
148GTLE_Eng-Spa - Page 12
... to be all motorists. You are not allowed to carry on the corner of gas in your CB to find your destination. • Help law enforcement officers by over-powering them with another station ...and are not allowed to blast others off the air by reporting drunk and reckless drivers. HOW YOUR CB CAN SERVE YOU
• Warn of traffic tie ups ahead. • Provide weather and road information...
Circuit Diagram - Page 2
..., 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...,
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
-
11-128
Resistor, Carbon.Film, 3.9K...,161.
BILL OF MATERIAL FOR COBRA 148GTL
CIRCUIT SYMBOL
IC-1 IC-2 IC-3 IC-4 -
Circuit Diagram - Page 3
...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 ... 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-...
Circuit Diagram - Page 1
...
"1401/
10F5- T4700P
_,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
-
R149
1BK
R239
- 17, 10K
0125
038 S2473
9150 220
th
1231 C31947
0124!"' .0224
/77
151
Z2K 7.210.19 TPP use 7.sosime...
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