Question about Cobra 150 GTL DX Base CB Radio

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Cobra 150GTL DX

Bought this unit new, and i have nothing but static. I even tried a different antenna, but still have static. Please if someone could help me with this?????

Posted by halgarvin on

  • halgarvin Aug 27, 2007

    the Cobra 150GTL DX MOBILE RADIO used in a vehicle. as for power supply its connected to the vehicle battery. i used a CB antenna that is installed on the vehicle

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4 Answers

Anonymous

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Try doing the freq mod that anymhz mentioned its probably the easiest radio to open up there is i will walk you thru it if needed

Posted on Aug 06, 2009

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Has the unit been converted for CB??? if not you may just be hearing the noise from 28-29MHz and noone is talking. Any more info could help...

Posted on Jun 17, 2009

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Anonymous

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I have same problem, please let me know if you find any info.

Posted on May 04, 2009

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How do you have it installed? in a vehicle? or in a building. What power supply configuration are you using? Is it adequately earthed/grounded? What type of antennas do you have? waiting for your info :)

Posted on Aug 27, 2007

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The 'ground' you need is not an electrical ground but an RF ground. The easy answer is that you need to mount the antenna to a mirror or the bumper or even use a magnet mount instead on the roof. The body of the vehicle provides an RF ground that the small truck box cannot. The only way it might work is to use flat, wide ground straps at all four corners of your box to the bed of the truck. You need metal-on-metal contact.

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No, those radios are good radios. I have one just for setting swrs on antennas.

First, I went back and read your last question. You said you have a nylon washer on top AND bottom? Did you mean one under on the top and bottom side of the antenna mount? You only need theone on the top of the antenna mount, which stops the antenna itself from being grounded out. Having one on the underside stops the outter part of the stud, the one that touches the outer screw on part of the coax from being grounded. Without that getting a good ground, you have no groundplane, which will cut your tx/rx to a max of 2 miles. Also, how close is the two setups. Many times, if two vehicles are setting next to each other, you will not receive or transmit properly, just get a nasty garbled with a hint of a squeal.

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http://www.cbtricks.com/radios/cobra/150gtl_dx/tsb/cobra_200gtl_dx_tsb_10041.pdf

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