Question about Cobra 18 WX ST 40-Channels Base CB Radio

1 Answer

No audio transmit or recieve adio chip 1A7217AP IC

No audio transmit or recieve audio chip K1A7217AP

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It may not be that IC but maybe a electritic cap or a transister.

Posted on Feb 16, 2015

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1 Answer

No audio got transmit ion


check to make sure you are in CB mode . then check to make sure your internal speaker is working. If still no audio it could be your audio chip ,your final or your main IC

Mar 15, 2013 | Midland Radio Communications

1 Answer

Cobra 25 ltd will not transmit it will on pa mode and it recieves i replaced the final pll chip audio chip.can you help


there is the problem. a $150 repair bill for a $ 25.00 problem. After you put in this new IC did you put it on a scope to check it out.How about a frequency counter to make sure you were on the right frequency? take it to a tech and let him fix it .

Oct 16, 2011 | Cobra 25 LTD 40-Channels Base CB Radio

1 Answer

Radio comes on will not talk or recieve


Is the meter moving on key up or another radio transmiting to it?
Switch for S/RF, CAL, SWR.........set to S/RFRF gain knob full clockwiseSquelch counter clockwise
If just audio is missing my be Audio Chip i think IC3Bad Crystal or solder to it.May be bad PLL chip any of these 3 could affect both TX and RXI do not suspect mic as there would still be audio just at low volume on receive.

Oct 03, 2011 | Cobra 29 LTD CB Radio

1 Answer

Got a connex 3300HP has a ranger board and chipset won't modulate recieves fine keys up relay clicks needle doesn't move no voice either cant find schematics


You may have a dead meter.
Modulation is audio's affect on swing wattage or pep. Notice that needle moving more with your voice.
Dead key or carrier wattage is without your voice enhancing the power only with mic keyed.
I can only assume that the chipset you are referring to is an ic chip audio or pll which must be working if you are receiving audio.
Check your mic cord................ transmit and modulation and even your receive volume can be affected by the cord/mic plug solder joints or broken wires here.
http://www.cbtricks.com/radios/galaxy/dx33hp2/graphics/dx_33hp2_sch.pdf this is a similar radio the General Lee, Connex 3300hp and Galaxy hp2 share boards i believe dont hold me to that thou.


Aug 20, 2011 | Connex 3300 240-Channels Base CB Radio

1 Answer

I have a cobra 29 LTD that has no audio in the PA mode or the CB (transmit or recieve) mode i've changed mics and also changed the audio IC to no avail. where do i look now?


look into buying a new radio. If you had researched further you would have found out that unless you are on cb your radio will not operate . If you are on PA the you can only transmit through the PA system not the cb. If you changed the audio IC then you probably did a cold solder on it. You need an external speaker to operate the pa mode and an external speaker to operate the CB mode .If you decide to fix it more it will cost you more then buying a new radio.

Jul 14, 2010 | Cobra 29 LTD CB Radio

1 Answer

29 nw LTD no audio on receive out the speaker in the radio or through the ext speaker and on transmit no audio.Radio shows a 4 watt dead key


If you take your external speaker and plug it into your PA jack in the back and key up your mic do you hear anything. If so then its not your IC chip if not its your IC chip and it will need to be replaced.

May 14, 2010 | Cobra 29 LTD CB Radio

1 Answer

158edx,no recieve audio


Most of these kinds of radios will have two audio chips , on for transmit and one for recieve.sounds like you popped the recieve audio chip.

Feb 07, 2009 | Superstar SS-3900EGHPA CB Radio

1 Answer

Mic wiring for a cobra 85 base cb


Pin 1 is shield, thats the bare wire wrapped around the mic audio wire
pin 2 ic mic audio [usually white)
pin 3 is transmit or push to talk usually red
pin 4 is recieve or speaker complete usually black

Jan 08, 2009 | Cobra 25 LTD 40-Channels Base CB Radio

2 Answers

No recieve on virgin cobra 142 gtl,


seems to me that the audio ic of the cobra 148gtl brokedue sudden change of voltage from power suplly or flactuation. ta7222p

Jun 07, 2008 | Radio Communications

2 Answers

No sound


take off bottom cover and see if the speaker wire came off.make sure its on cb and not on pa and make sure its plugged into the right port

Mar 03, 2008 | Cobra 148 GTL 120-Channels Base CB Radio

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