Cobra Radio Communications - Page 4 - Recent Questions, Troubleshooting & Support

If it "keys up" without a mic plugged in, try plugging the mic into the radio and see if it stops. Some radios require the mic to be plugged into it to operate properly. If it is keyed up with the mic plugged into it, try unplugging the mic and see if it stops. If it does stop when you unplug the mic, either the switch in the mic is stuck/went bad or there is a wire shorted in the mic cord to radio plug. Make sure pins 3 and 4 on the mic plug are not shorted. A continuity meter will tell you. If the mic is keyed, pins 3 and 4 will show a short, if the mic is not keyed, pins 3 and 4 should not show a short. If the mic is functioning normally but the radio is still keyed up then there is something in the radio that is shorted.

pull the batteries out, slam them ******* a solid surface. put 'em in, let 'em charge. if that doesn't bring 'em back buy new bats.also, use a voltmeter to make sure the charger was getting voltage.
Good luck!

That diode is a 1N4003 and you can find them on mouser, ebay, digikey etc

1) violet 2) blue 3 ) shield 4) yellow 5) grnd Violet inside the mic is the power wire . Blue and yellow are the internal and external speakers. the other wires are to the antenna

Hi, try to make a reset to the system, computer, router and the camera, usually by disconnecting from the main and reconnecting regards, Daniel https://www.rylwy.com/diy-magnetic-loop

https://www.youtube.com/watch?v=a85zMM46Gi8 You watch this video and check your power output specially on those channel at chich not transmitting, if there is no power at those channel it mean that you program out of range radio band frequency, so you check your frequency and correct it.

RF Gain

It is very likely that the reverse polarity diode inside the radio is shorted, usually because the radio was connected up incorrectly.

Generally the higher your mic gain is set, the higher the modulation level. You want to avoid splatter by not setting the mic gain too high.

' Move the antenna angled forward ' Freightliner cascadias have powered driver and pass windows plus a thermostat inside the mirror arm ,The motors and electrical wires produce a EMF bubble that will disfigure the RF and absorb the energy. If you mounted the antenna to the mirrors arm with a bracket, just keep pushing it forward untill it passes the test.

I have the same walkie talkies and on mine I can hold down the mode/lock button and it will come off of the Rx mode. Also, you should be able to press the talk button and it will come off of the Rx mode.

Most likely, you have no 'voice' signal coming from the microphone. The MODulation control did not turn itself. Check for signal from the shielded or white wire from the mike. A capacitor could have shorted in the modulation limiter circuit, limiting the modulation to 0%.

Here's the manual. You should find what you are looking for in here.

Try going to cbtricks.com. You'll find most of your answers there, and more.

I am not sure just what is stuck, the button or the switch itself. If it is the button, try swabbing it with a Qtip soaked in Isopropyl alcohol to loosen any grease or dirt that may be causing the problem. You might want to open the case and remove the guts, being careful not to break any wires. If the button can be removed, clean it thoroughly and put the thing back together. If the switch is shot, then you probably should just purchase another radio. Unless you are a micro surgeon, you probably won't be able to replace the switch yourself. A new radio is less expensive than taking yours to a shop for repair.

pay and get it done right so the radio does not get destroyed.

Not setting your SWR meter up isn't the problem, but it could indicate that you have a problem with your antenna or feedline or connectors from the radio to the antenna. If your feedline is shorted, then you will not hear anything or be able to transmit.

They are available on the net. Here's a good link: http://www.cbtricks.com/radios/cobra/29ltd_29ltd_st_29wx_st/index.htm I go here for almost all of the CB diagrams that I need. Unlike a few CB related websites, I have found this one to be very accurate. Good Luck.

First of all, unless you have an amplified base, the D104 will not work very well with a low impedance input, which is what most, if not all modern Cobra's use. If your base is amplified, then check the internal battery. The pin out you are using sounds about right. You may also want to adjust the control on the bottom of the mic to see if that helps. There is a possibility that your mic cartridge has been subjected to moisture. This will kill this type of mic cartridge and if it is fairly old, then you may have to replace the cartridge. New, but not original cartridges, are available on EBAY. I bought a few several years ago and they work very well. There are also Electret cartridges available, but they will not sound like the D104. It makes the D104 something completely different, but you might like the sound.