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Cobra 25 WX-NW-ST 40-Channels Base CB Radio Questions & Answers
No audio transmit or recive
check your final for voltage, work your way from IC 1 on up then check audio transistor . Work your way through the transmit section then the receive section . Check your volume control ,make sure its working alright Just have patience and it might jump right out at you.
3/24/2016 3:38:48 AM •
Cobra 25...
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Answered
on Mar 24, 2016
I wish to tune and
do you have a spectrum analyzer? A function generator , bird 43 watt meter,multimeter etc. ? If you have all these then go to www.cbtricks.com and get the information you need .
2/15/2015 11:35:47 PM •
Cobra 25...
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Answered
on Feb 15, 2015
My Cobra 25 NW ST
you probably had it plugged in wrong to begin with. get an external speaker and plug it into the external speaker plug on the back of the radio.
12/22/2014 12:32:42 AM •
Cobra 25...
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Answered
on Dec 22, 2014
Radio reception
Cb radio is line of sight. If there is a hill in the way, or some other kind of structure it will block the radio waves.
But also, radio waves, will bounce of the ionosphere and come back down.
So whats probably happening is...
You hear people close because they are near. You can't hear some one some what far away because of hills or something, but you talk to people far away because the are within range of the radio waves bouncing back down to them
8/26/2012 6:24:09 AM •
Cobra 25...
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Answered
on Aug 26, 2012
On my Cobra 25 WX
- What size fuse are you using? Is this radio a new radio to you? Is it new out of the box? How many muddy footprints are in it. In other words any mods been done to it? If so which?
- Since you have your multi meter out I'd like you to look at the board that the WX/CB switch is. There will be some resistors and diodes in the general area. One or the other is not letting current flow and is blowing the fuse. Check the resistors and diodes right before the wire that goes to the board the little switch is on. Resistors can test other side and should test for the appropriate Ohms. Diodes should have current in only one direction and if it does not it is bad. If a part is suspect unsolder it to get a conformation of it's functionality. Check for bad solder joints or loose wires too.
- You may need a new meter as well. You can get one at a great price here. http://www.texxcomm.com/ at the moment their website is being updated but he is a great dealer in CB parts.
- Check around the mic connector on the inside of your CB. Check for cracks and loose soldier joints. This is gonna take a bit of time for you to go through things.
Regards,
Tony
12/23/2011 9:40:04 PM •
Cobra 25...
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Answered
on Dec 23, 2011
Test
check check.
3/5/2011 8:12:07 PM •
Cobra 25...
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Answered
on Mar 05, 2011
I don't know how I
it depends on what radio if you have a cobra 18wx style or maxon's, or a radioshack type the red is constant power 12v, orange is a switched 12v.. IE key like a stereo, and black is ground. if you have a 25 or 29 ltd types or exports they only have 2 wires red 12v and black ground. but you do find some power cords that have all three, and the orange on the 25 / exports are not used.
2/9/2011 3:33:43 AM •
Cobra 25...
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Answered
on Feb 09, 2011
I CANNOT TRANSMIT
1st check mic then coxial /antinna ground/then if still haveing probblem check to see if SWR is set to antinna
1/3/2011 11:42:22 PM •
Cobra 25...
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Answered
on Jan 03, 2011
I have a cobra 25
Hi, my name is John. Welcome to FixYa. Turn your MIC GAIN or DYNAMIC to MAX. Try another mic on it , if that does not do the job, let me know I will have further. Thanks for choosing FixYa. good luck John
10/30/2010 4:30:26 PM •
Cobra 25...
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Answered
on Oct 30, 2010
Can't talk to anybody, but can hear them just fine.
Could be a few things.One as simple as a bad soilder on the board or your voltage regulator could have went out. If you take the top cover off and talk in the mic and its starts transmitting then you have a bad soilder to check the regulator is a little harder and not for just anyone to do.
5/8/2010 12:25:33 AM •
Cobra 25...
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Answered
on May 08, 2010
Blows fuses
When you open up the radio and look at the component side (top of pc board), the diode you are looking for is D17. It is located basically in front of where the PA jack connected to the pc board. Just make sure when you solder the new one in place, observe the side that the grey band is on, which should be facing toward the point of the arrow pic.
You can pick the diodes up at most Radio shacks or online through
www.partsexpress.com. I use Parts Express for all of my small electrical components and tools. They are very reasonable and very trustworthy. The diode you are wanting is called a Rectifier Diode. The part numbers range from 1N4001 and 1N4008. I use 1N4007 (the only one Parts Express stocks) and it works just fine. Here is a direct link to the page with this diode
http://www.partsexpress.com/pe/showdetl.cfm?&Partnumber=1N4007
They are only .09 each. I hope you get your radio back in working order.
Dean Pitts
Rollin CBs
Mt. Vernon, TX
7/3/2008 8:07:41 AM •
Cobra 25...
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Answered
on Jul 03, 2008
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