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Re: Cobra 25 LTD Classic
Turn your squelch all the way counter clockwise and your rf gain clockwise. If that doesn't help, try hooking up an external speaker to make sure its not the internal speaker. If these help or don't help, please reply on this thread to let us know, so we can give you more advice if needed.
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The only "adjustment" is the AM POWER trimmer. Lowering this will lower your dead key but will also lower your "swing" power. the TX circuit must be modified to lower the dead key and maintain full output. there are many articles on the web for such modification.
first make sure its on cb not pa. next make sure the squelch is all the to the left. now make sure your volume is open enough not to blast. If you can hear anything you are good if not you need to take it to a tech.
hello firstly it would be wise to connect your power lead directly to your battery
secondly have you checked the vswr on the antenna make sure it is tuned to your radio i presume you have an swr metre and lastly check all coax connection make sure none are shortening out check pl259 at rear of radio and also check lead goin into antenna you can ajust the antenna by raising or lowering the whip .when you acheive 1.5 or better tighten up it should work ok for then
Hi,my name is John. Try turning your MIC GAIN to MAX. Let me know how it goes. Could be something internal that I might could help you with...Hope this was helpful...Rate this solution on the four thumbs-up ...Good luck.... John
With the radio on, and the case off. Rub your finger gently across the contacts of the audio chip on the trace side of the board. If you hear noise from the speaker it is good. if you don't hear anything(make sure the speaker is hooked up) then the audio chip is bad. You need to change it.
the mics on these cobras have a receive wire in them so the transmit will still work even if the receive wire is broken,if this wire is broken the unit will not make any sound...........remove the plug from the radio end of the mic and check the connections on the 5 pin connector.....(could be a cold solder or broken wire) or try a new mic or one that is proven work on another radio hope this helps.................good luck!
The Cobra 25 requires the mic to be working for any sound to come out. My suggestion is that you first try a new mic. If this doesn't work, look real close at the board on the soldered side ( around the if section, thats the area that right under the waxed area on the component side of the board ) for cold solder joints ( broken lead solder) You may need a magnifing glass. Good Luck