Question about Cobra 148 GTL 120-Channels Base CB Radio

2 Answers

Cobra 148 gtl d has problem transmiting with covers off. trying to tune radio up. was thinking I need to ground the chasis

I'm trying to due a standard tune up. the radio won't transmit with the covers off. it will sometimes and sometimes it won't. this is a 2011 model cobra 148 gtl D. i'm thinking this might be a ground problem or i'm thinking i have a bad final or something else. help if you can thanks

Posted by on

Ad

2 Answers

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    MVP:

    An expert that got 5 achievements.

    Sergeant:

    An expert that has over 500 points.

    Governor:

    An expert whose answer got voted for 20 times.

  • Expert
  • 193 Answers

I would say a bad or cold solder joint on board somewhere. Bad quality control. Might flex radio chassis slightly while keying? A tooth pick and hours of probing around switching area on board and the pa section till problem found.

Posted on Oct 27, 2012

Testimonial: "gave me somthing else to consider. radio did show sighns of not wanting to switch into tx mode. however with was able to atempt to tune with the radio putting out about 1 watt swinging to about 4 watts. quality control has been an issue with this new 148. thanks for your input"

Ad
  • Level 1:

    An expert who has achieved level 1.

  • Contributor
  • 1 Answer

On the 148 gtl sone body cut the pink wire on mic hai were does it go

Posted on May 09, 2016

Ad

6 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of.(from cars to computers, handyman, and even drones)
click here to download the app (for users in the US for now) and get all the help you need.
Goodluck!

Posted on Jan 02, 2017

Shuttle83
  • 1139 Answers

SOURCE: cobra 148 gtl new model

Hello bluzfan, Do you remember the old 40 channel CBs? they used basic A3A transmission (dual sideband single carrier)remember how you got crosstalk sometimes, if your power was too high? Then they went to 80 channel CBs (using a single side band as Lower Side Band (lsb) and the other as the upper side band (usb))? more crosstalk but they invented anl (automatic noise limiter)circuitry to compensate. Now you have the 120 channel CB which uses a form of side band multiplexing (20QAM) to generate 3 times more channel density 40 X 3 = 120. Here is my problem; Cobra should not have done this because you will have massive crosstalk and unaudible sounds because of the increase in channels but not an increase in initial (physical)bandwidth. I hate to tell you this but the only cure for the is to use it in 40 channel or 80 channel mode forget the 120 channel mode, or get a radio with better channel separation.

Posted on Oct 07, 2007

SOURCE: cobra 148 gtl

Open the radio up and find the L22 Can/Pot. It's the one with the wire soldered on top. With both fine and coarse Claifier/Voice Locks in the 12 O'Clock positions, confirm, then listen for someone that is on the correct frequency and turn this pot (small ferrite core inside) with a small plastic preferred screwdriver, until they sound clear. Do this for USB as well except, the Can/Pot is L59. Don't adjust the VR5 (transmit) unless you need to.

Posted on Dec 01, 2007

SOURCE: cobra 148 gtl

First take a jumper wire and connect it to the DC Ground of the input of the radio then touch it to the TX pin on the radio if it does keyes up then its in the mic or mic cord on the end of the mic plug or where it goes into the mic cable goes up inside the mic. If the radio don't key up at all then check the main voltage regulator chip one pin will have 8 volts transmit and another pin will have 8volts recieve. If you get no switching DC voltage on the regulator then its bad and needs replacing there is also a known bad capacitor in the radio thats only 10 volts change it to 25 volts at the same capacitance.

Posted on Jan 08, 2008

Mechanic688
  • 204 Answers

SOURCE: 148 gtl

Hi Benimur, the only reason I chimed in on this topic is that years ago my CB shop did some testing on that antenna and a few others from Workman using a MFJ 269 analyzer. I seem to remember there being a coax chart available for CB freq's and also 10 meter freq's. There is no tuning adjustment on the ant itself, so there has to be some way for adjustments,, thanks, Mechanic

Posted on Feb 07, 2008

  • 36 Answers

SOURCE: have a new cobra 148 gtl took out of box no transmit or recieve

make sure that your [swr] hadn't changed or went higher than a 1.5, anything higher will interfere with your tranmitting an recieving. other than that with out being there to see an hear your radio this would be the first place to start.

Posted on May 05, 2009

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

Want to lower my dead key on my cobra 148 gtl mobile...where do i find the adjuster?


need to get a watt meter hooked up to then go the where the final is and look aroung for a tuning slug marked L38 and that is the baby you have to turn in order to power down this radio.

Nov 09, 2013 | Cobra 148 GTL 120-Channels Base CB Radio

1 Answer

How do I increase power output for a cobra 148 gtl the latest Chinese version


best way is to leave the radio in piece and obtain a linear amplifier to do the job a 10 meter ham radio amplifier will do nicely but you must re-tune it for the 27 mhz band 10 meter band is 28 mhz.
RF amps work best using side-band mode.

Oct 14, 2013 | Cobra 148 GTL 120-Channels Base CB Radio

1 Answer

Cobra 148 gtl-st wont transmit but receives great


Check first your microphone

• check if TX is engaging when PTT is pushed.


• check for continuity ( mic and cable )



If you have not done these steps,

try it first, or borrow other compatible mic for Cobra 148GTL

from your friends on air.

Jul 28, 2012 | Cobra 148 GTL 120-Channels Base CB Radio

1 Answer

My cobra 148 work well on am but not on lsb


clipping the limiter should not have prevented tx on sideband are u sure u didn't do something more accidently. r 131 is the correct limiter for the 148. just out of curiosity what year 148 is it?

Jun 15, 2012 | Cobra 148 GTL 120-Channels Base CB Radio

1 Answer

How to increse the watts?


Take your radio to a CB Shop and have them 'tune it up' or 'peak' it. It is usually a modest fee and will improve the transmit range of the radio. There are usually shops near truck stops, just ask around on channel 19 in the area if there is a shop nearby.

Some radios do better than others, there may not be a great improvement on your particular radio.

Feb 06, 2010 | Cobra 148 GTL 120-Channels Base CB Radio

4 Answers

Have not used my cobra for some time ...sine someone need my K40 antennae more than me. Just put it back in service with a new magnet mount 36 inch - can send and receive in USB and LSB ....can here in the...


Center the antenna on the vehicle, then check the SWR on channel 1 and channel 40.
with the switch in CAL position, key radio and use the swr/cal knob to set the meter so the needle is just touching the end of the red area on the right-hand side of the meter.
Once calibrated, unkey and switch the switch to SWR and key up again. The lower the reading, the better. If the SWR is Higher on 40, the antenna needs to be shorter.. if its higher on 1, then the antenna needs to be longer.

if it dont transmit period on AM, then there's an internal glitch :)

Jan 24, 2010 | Cobra 148 GTL 120-Channels Base CB Radio

1 Answer

Cobra 148 won't stay on frequency, same frequency on all channels


If you have a frequency counter, and a set of TV repair tools,( a set of special screwdrivers) You can tune the transmit on it. I would not do this unless you are skilled in such things.

The easy thing to do is take it to a cb shop. Usually you can find them at truck stops. They usually charge $30 for an alignment.

If you think you can handle it, I can try to talk you through it.

Apr 28, 2009 | Cobra 148 GTL 120-Channels Base CB Radio

1 Answer

Have a new cobra 148 gtl took out of box no transmit or recieve


make sure that your [swr] hadn't changed or went higher than a 1.5, anything higher will interfere with your tranmitting an recieving. other than that with out being there to see an hear your radio this would be the first place to start.

Apr 25, 2009 | Cobra 148 GTL 120-Channels Base CB Radio

2 Answers

Want to disconnect the bleep altogether on my cobra 148 gtldx


If this is a stock cobra 148 gtl 40 channel am plus side band, they don't to my knowledge come with a built in r beep. Some roger beeps are instaleed through the transmit circuit on the mic, so if not in the know Don't try to fix it.Some microphones have a beep built in. I used to install beeps on these radios using the pa/cb switch to turn them on. also try the nb switch or the swr/rf switch.

Feb 04, 2009 | Cobra 148 GTL 120-Channels Base CB Radio

Not finding what you are looking for?
Cobra 148 GTL 120-Channels Base CB Radio Logo

296 people viewed this question

Ask a Question

Usually answered in minutes!

Top Cobra Radio Communications Experts

AnyMHz.com
AnyMHz.com

Level 2 Expert

500 Answers

Brad Brown

Level 3 Expert

16174 Answers

yadayada
yadayada

Level 3 Expert

76846 Answers

Are you a Cobra Radio Communication Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...