Question about Cobra Radio Communications
Will receive but will not transmitt
It could be the switch or the relay to look at first- See if the relay contacts close- if not trace that circuit, it might be a defective microphone switch.
If you do get relay action, check for voltage at VR10, VR12 and VR14
These are biases, so they may not be "high" voltages when using an analog meter.
If you have voltages, the final is likely dead. If you do not have voltages, tie to look for bad solder joints and broken resistors.
Posted on Feb 08, 2012
Testimonial: "put in another car and it is transmitting but the needle does not go up but does work when receiveing"
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Posted on Jan 02, 2017
Try a different mic, they CAN cause no sound (receive), and no talking. If that isn't the issue, I'd go to my coax cable, even though they don't look broken doesn't mean that they aren't. I've seen quite a few brand new ones that are bad right out of the box. If all of that checks out I'd grab an SWR/power meter and do a check to see if the radio was registering on the inline meter. I'd say use the one on the radio, but I'd like to see it on the inline so you can really tell whats going on with the radio. I think I'd also get a spare radio, or a friends, and put it in my vehicle and see if it gets out. That would be the best way to check your coax and antenna setup. Aside from that, which is just simple cb logic, I'd say you may possibly have to bring the radio to a tech and have them check it out. I have a DX-959 and a DX-99V and I gotta say, knock on wood, no issues with either one. I really hoped that helped and let me know how things turn out. Its always good to hear from people after they figure out what was wrong, that way we all learn...
Posted on May 14, 2009
Based on your post of no transmit, a couple of possibilities:
1. defective microphone or cord or PTT switch (the red TX light does not come on when pressed);
2. TX light comes on but no output, defective finals and/or drivers. These are the transistors screwed to the chassis of the radio very near the antenna terminal;
3. defective regulator IC that provides the TX B+;
5. insufficient amperage from you power supply;
6. too high SWR.
Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.
Good luck and kind regards.
Thank you for using FixYa.
Posted on Feb 16, 2008
If there is no transmit at all, it sounds like it wasn't fully refurbished. If it is just low modulation then just turn VR16 and VR14 all the way to the left.
If its not working at all, send it back. It hasn't been refurbished.
Posted on May 03, 2009
mike has wiring problems. Check for breaks in cord and where the plug goes into the unit. If not original mike then has incorrect wiring for the radio and will need to be changed for config
Posted on May 01, 2010
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