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Question posted by rpriolo on April 4th, 2022

Squelch Seems Very Low, Almost Can't Hear It

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Answer #1: Posted by SonuKumar on April 4th, 2022 10:04 AM

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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

...™ Accessories If You Think You Need Service, please contact your Cobra CB Radio System. The Cobra® line of Purchase Dealer Name Keep this manual ... "PACKING" FOR POSSIBLE FUTURE USE. 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 Section III: Installation 5, 6, 7, 8 Section...

148GTLE_Eng-Spa - Page 3

...Indicators 40 AM, 40 LSB, 40 USB. 26.965 to +50° C). Receive: Squelched, 0.25A Maximum audio output, 0.6A. 2 3/8"(H) x 7 7/8"(W) x 9 1/4"(D). (6 cm ... kg). Transmit: AM full mod., 2.2A. SSB, 12 watts, PEP. High-and low-level Class B, Amplitude Modulation. Meter shows relative RF output power and SWR. The receiver ... most advanced SSB/AM two-way radios ever designed for use as a ...

148GTLE_Eng-Spa - Page 4

... AM and SSB RF Gain Control Automatic Gain Control (AGC) Squelch ANL Noise Blanker Voice Lock Range Audio Output Power Frequency Response ...3 KHz, 50 dB @ 9 KHz. When mounting the bracket and radio to 100,000 microvolts. Connect the black lead to mount the transceiver:... output. AM: 7.8 MHz 1st IF, 455 KHz 2nd IF. Most CB antennas are terminated with a type PL-259 plug and mate with good ...

148GTLE_Eng-Spa - Page 5

...metal electrical ground in adjusting your COBRA dealer or a 2-way radio technician for help in the vehicle. Also, when extremely low level signals are slightly directional, in the hull and water.... as a ground plane. The unit requires very little current and therefore will reach a low point and then start rising again. A vertically polarized, quarter-wavelength whip antenna provides the...

148GTLE_Eng-Spa - Page 6

... be heard. Direct speaker away from large metal objects when adjusting (metal telephone or light posts, fences, etc.). During normal CB operation, the Volume control is used to prevent acoustic feedback. SQUELCH (outer dual concentric). This control is used to cut off or eliminate receiver background noise in order to the PA...

148GTLE_Eng-Spa - Page 7

... any one of the receiver operating frequencies above the Channel Selector knob. TONE SWITCH-HI/NOR/LOW. Bass is increased in the ANL + NB position, the RF noise blanker also is activated... the "SWR" control to the CAL position. PA/CB SWITCH. If the public address feature is connected. When the switch is placed in the LOW position and treble is normally used to shape the audio...

148GTLE_Eng-Spa - Page 8

...CB position and turn unit on by pressing the (PTT) mic switch, and adjust the SWR control to the ratio of the coaxial cable and all RF electrical connections. Listen to the background noise from standard AM reception in the Citizens Band: AM, USB, and LSB. The SQUELCH...USB) may be received with low-impedance (500 ohm) dynamic ... may be present). The radio comes complete with 100% of...

148GTLE_Eng-Spa - Page 9

...correctly whereas in the incorrect mode, the voice will hear the increase in the resultant tone from the receiver. Transistorized type microphones have a low output impedance characteristic. The third lead is for receive...14 15 Also, there is set too high, voices will be high-pitched and if set too low, voices will cause a decrease in the output tone of the microphone cable (see Fig. 2.) ...

148GTLE_Eng-Spa - Page 11

...transmitting OK, message received Relay message Busy, stand by Completed last assignment Can you a radio check EMERGENCY TRAFFIC Trouble at this station Confidential information Correct time is 10-91 Talk ...and answers. Refer to channel Identify your local dealer. 18 Section VI Appendix Citizens Band radio operators have largely adopted the "10-code" for you 10-45 All units within range ...

148GTLE_Eng-Spa - Page 12

... • Provide direct contact with your office or home. • Make friends for use your CB. 6. You are not allowed to carry on the corner of emergency or breakdown. • Suggest...EMERGENCY MESSAGES ONLY FCC gives the following examples of permitted and prohibited types of gas in your CB to be all motorists. You are not intended to sell merchandise or professional service. No ...

Circuit Diagram - Page 2

... CH 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 107 ...14,16,19,22,23, 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 - 11-128 Resistor, Carbon.Film, 3.9K ohm 1/8W Resistor, ...

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 ...