20 Most Recent Cobra 25 LTD 40-Channels Base CB Radio Questions & Answers


Got a es880 echo chamber cybernet wirerd i want to wier to my super star 3900crt whats the wiering code help please thanks Tom

Cobra 25 LTD... | Answered on Mar 11, 2018


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!

Cobra 25 LTD... | Answered on Apr 21, 2017


you must have great knowledge of CB'S to tackle this problem.

Cobra 25 LTD... | Answered on Sep 13, 2015


first,a realistic plug is a 5 pin D.I.N. type and a cobra 25 is a 4 pin screw on . If you are trying to save $$ by using an old mic then let me say that you can get them prewired real cheap.

Cobra 25 LTD... | Answered on Jul 16, 2015


buy a different cobra 25 4 pin mic and try that . If that doesn't work than you inherited a piece of junk .

Cobra 25 LTD... | Answered on Feb 16, 2015


no need for wiring diagram just replace the reverse polarity diode. Look at where the power wires come into the radio and you will see a diode. that's the one to change.it should be a 1n4001

Cobra 25 LTD... | Answered on Feb 16, 2015


1,if your antenna is not properly tuned you may be loosing receive as well as power 2,how your swr? 3 you may want to purchase a little driver with a built in receive amp.

Cobra 25 LTD... | Answered on Feb 02, 2015


L 19 is the adjustment can for the N/B . If you choose to adjust it then turn it a little at a time. If it still doesn't work right then let a tech take care of it.

Cobra 25 LTD... | Answered on Dec 22, 2014


sounds like a voltage problem that you are incapable of handling. Take it to a tech.

Cobra 25 LTD... | Answered on Dec 22, 2014


did you play around on the inside of the radio???

Cobra 25 LTD... | Answered on Dec 22, 2014


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 .

Cobra 25 LTD... | Answered on Dec 22, 2014


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.

Cobra 25 LTD... | Answered on Nov 25, 2014


VR5

Cobra 25 LTD... | Answered on Nov 25, 2014


not on frequency, take it to a tech.

Cobra 25 LTD... | Answered on Nov 25, 2014


check VR4 to make sure it isn't closed . Check D 11 to make sure it isn't clipped . Turn VR 4 clockwise till it stops then back it off a little .If D 11 is clipped replace it with another diode then try it again. If it doesn't work it could be your final or your driver so replace both..

Cobra 25 LTD... | Answered on Nov 25, 2014


what is your dk. just remember 4.5 watts is the limit

Cobra 25 LTD... | Answered on Nov 02, 2014

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