Question about Cobra 29 LTD CB Radio

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I purchased a s500 Talk-Back speaker. There was not paperwork included with the speaker. Which wire is the PA. I am thinking it is the small red wire. Also: in order to use the Blue Tooth function of the 29ltd BT must I have a bluetooth microphone. It appears, from the literature, that it is not necessarily required. The radio was very recently purchased and has not yet been installed.

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  • ken_br1 Jan 17, 2009

    Thanks for the response Jay. As it turned out the Talk-back speaker that we were installing was bad out of the box. We exchanged it for another and all is fine. However your response was right on target.

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It is the small red wire that goes in the PA, or you can just ground this wire. The bluetooth will work through the stock microphone.The external mic is for handsfree use.

Posted on Jan 16, 2009

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Are you following the user manual that came with the radio?
NB-ANL/CB/PA SWITCH: When the switch is in the NB/ANL position, the Noise Blanker (NB) and Automatic Noise Limiter (ANL) circuits are activated.
The Noise Blanker is very effective in eliminating repetitive impulse noise such as ignition interference. In the CB position, the PA function is disabled and the radio will transmit and receive on the speaker that is connected. In the PA position,
the radio acts as public address amplifier. Your voice will come out of the speaker that is plugged into the PA. SP. jack on the rear panel. The radio does not operate when you are in the PA mode.

When you plug a speaker into the ext. jack does it kill the radios internal speaker? It should until you unplug it; if not and you are following the about you may have a wiring issue with the jacks.

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How do you wire a PA speaker to a Cobra 19 CB radio? I know this is broad yet nothing has worked including using a 6' 3.5mm mono audio cable with tinned ends and connecting the pa speakers wires with the...


  1. www.cbmonitor.cz/...manualy/Cobra/Cobra%2019%20Ultra%20III%20manual.pdf
    pdf.textfiles.com/manuals/.../Cobra_19%20Ultra-II%20CB%20Tranciever_Manual.pdf -

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Hi and welcome to FixYa,

Initially, the speaker of course has been checked?

Offhand, would partial schematic of the mic and speaker section help?

7008f3b.jpg

Good luck and thank you for asking FixYa.

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1 Answer

Losed all


The talk back may be nothing more than a 10 ohm resistor shorted across the pa/external speaker outputs. If this is the sitution, the resistor may have damaged the audio chip. Remove the resistor and see if this corrects the problem. If not you may need to replace the audio chip. Hope this helps
Ed
NC Electronic
Mills Wyomign

Jan 06, 2008 | Cobra 29 LTD CB Radio

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