Question about Cobra 148 GTL 120-Channels Base CB Radio

1 Answer

Old Cobra148 GTL

Transmits modulation if you are within 500 feet?
Meter does not move? So I am not able to calibrate it.
It is an older model. Have had it for twentyyears or so?
Wher might i get it repaired in MA? Thanks.

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  • Dean Pitts
    Dean Pitts May 11, 2010

    Are you sure it is a problem with the unit? I most comonly see this happneing when there is a problem with the antenna or coax. Usually if you can not reach out at least a mile, your antenna may be broken, not getting a connection with the center connector with your coax, or the center conductor of the coax is broken. I would try it with a known good coax and antenna.



    Another common problem I have seen is having the small round plastic piece, which is used to stop the antenna from being grounded, put under the mount. You need to make sure it us under the antenna and on top of the mount. If your antenna is grounding out to the vehicle, it is like you have no antenna at all.


    Dean

    Rollin CBs

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  • 67 Answers

Or maybe the final is out.. just TX on driver alone.

Posted on May 25, 2008

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You do set this up like a regular CB. The meters refers to how long the waves are. CB is 11 meters. So its very close. The antenna woud be tuneds slightly shorter. Use the SWR meter in the radio to calibrate just like you would a normal cb.

Now for the ABCDEF knob. each letter is 40 channels in the band. So A would be 1 - 40 channels, then B would be the next 1 - 40 channel frequencies. You use the frequency counter in the radio(providing that model has one) to tell what channel you are on.

Here is some info one the frequencies in the band.

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FM is frequency modulation.

10 meter radios can have AM FM SSB and DSB depending on the model and options it comes with.

So your radio has 6 ranges for freqency. each is 40 or 50 channesl. Not sure what model you have. If it has 40 then you have 240 channel freqencies.

with AM and FM, you double that, because you can talk on AM or FM on all the channels. If you are on AM and some one transmits on FM unless they are really close, you will not hear them at all, but if you do with will just be garbbled noise.

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