Question about Cobra 29 LTD CB Radio

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CB Base Station picking up electrical interference

I have my CB all installed and ready to go as a base station here at my house. But all I get is electrical noise when powered on and I have to turn the squelch way up high just to get it to go away. I've done radio checks and I can't pick the radio up from my car. I even tried my handheld CB and sat right next to it and received a very weak signal. I have even moved the base station a few times to see if that would work. This is a brand new radio which replaced a broken one (actually broken for sometime) but I never had this issue in the past. Now I have it connected via DC-AC adapter, could this possibly be the cause?

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  • Dutyacx May 11, 2010

    If you can't receive the signal from your car and it's very weak when you sit right beside it, I'm afraid you got a bad radio. Maybe DOA ?

    However, make 100% sure the antenna has a good connection with the radio and it's freely installed.

  • Kevin May 11, 2010

    Depending on the DC-AC adapter you are using, it could be the noise source.  Is it made for you radio, or are you using something that has the right output voltage for you radio? Can you run the radio off of a battery?  If you can, see if the noise is still there with the AC-DC adapter plugged in the wall, and with it not plugged in.  Did your handheld pick up any noise when you were next to the base radio?

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  • 32 Answers

I dont know what AC DC adator your using. you should look into a 12V power supply. or plugging that into a RF canceling power strip, like a monster power strip. TV's that are on or other appliances may cause high noise levels on the CB, make sure your coax is good, your antennas good, and all jumpers are good. its hard to tell with out looking at it, but do a quick once over of the system.... you are using a base antenna right? if not you need to create radials for a mobile you plan on using for a base.

Make sure the connectors on the coax are all on right, this causes problems a lot of the time. sometimes even brand new coax have bad connectors installed.

Posted on Jan 11, 2009

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Why can't I receive input from the outside sending unit?


Make sure that all the batteries are good!!
This procedure outlines the typical process to pair the sensor and base.
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·Remove the printed vinyl label from the LCD screen of the base station
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For best performance
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The base unit and other compatible
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For maximum distance and noise-free
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Have you considered all these points?

Is there a way you can move the base station to another location in your house to see if the problem get better? I don't beleive your base station is faulty, I suspect interference from something.

I don't think the 2.4GHz set is causing any issues, but you never know, try unplugged it for a while to investigate.

If you do determine that the base station is faulty there probably isn't many options to get it repair other than sending it to Panasonic. May be cheaper to buy a new base station to go with your extra handsets.

Good Luck!

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·Remove the printed vinyl label from the LCD screen of the base station
·Position the remote sensor near the base station
·Open the battery compartment at the back of the base station and insert (2) AA batteries according to the polarity markings. Replace the battery compartment cover.
·Within a short time the RF signal icon (located to the left of the outdoor temperature channel indicator) will start flashing. This indicates that the base station is ready to pick up the RF outdoor temperature signal from the remote sensor. It will continue to flash for 3 minutes or until the signal from the remote sensor is detected.

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There is no link between your cordless set and the base station, hence the message.

I would do what SpencerR stated, try to re-establish the connection via the base station to accept the handsets again.

Have the cordless sets worked before?
It may just have a hick up, I would un-plug the base station and leave it un-plugged... now get all the cordless sets, and take out the batteries in the cordless set. Wait for about 15 seconds for all the power to drain out of the sets, and re-install the batteries.

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