Radio sticks in TX mode after I let go of the button on the mic
I changed mics, tried three different antennas, sent it back to Cobra twice and they say there is nothing wrong with it. I used my swr meter on it and went to a professional and had him check the swr's.
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Re: radio sticks in TX mode after I let go of the button...
There is a relay in side of the cb that might be sticking. The problem is that this situation might be environmental. You say that you sent it back to Cobra twice for repairs. I think that the place you are sending it to differs enough environmentally so that the problem does not manifest itself. You can test this by exposing the unit to differenttemperatures, to determine if the internal relay is sensitive to variations in temperatures.
If you do find that the relay has become tempurature sensitive, you can order the part from Cobra, or strangly enough from Radio Shack, since they do carry the same part just by a different part.
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Can you explain your terminology? Feedback or Standing Waves? Typically, Feedback is audio feedback through the speaker and back into the microphone of the CB or out of the external speaker into the mic. It can also be RF Feedback that is caused when the system. If it is audio feedback, it could be that someone has installed a T
"talk back" option and that's why you are getting feedback, if it's audio feedback.
Most problems with radios that receive but do not transmit are antenna or antenna wire/connector issues. It's easy to receive with a marginal antenna but transmitting requires a good working antenna. If you have a SWR meter or can get your hands on one, install it in line with the antenna and test for reflected power. Of course, make sure your TX light comes on when you depress the mic switch. If not, switch mic and try again. Hope this is helpful! Reply if u can.
It will be hard to find a mic for the Solara radio today. I'm using 15 of these radios and found out the radio is obsolete and that the Chinese are not making any more parts for this radio and I bought every Mic I could find because this is a good radio beside the mic. If interested you can email me at firstname.lastname@example.org and I would be able to let you have a mic.
If you got a new mic open the radio from the back, there are 4 phillip screws on the back cover, remove the screws, then pull the back off, there is a rubber seal between the face and the cover, the seal is reusable, turn the radio face down, look at where the mic wire enters the face and there is a safety clip and a plillip screw that holds it in place, remove the screw, pull the clip and the mic wire is connected with a small 3 conductor quick-connect inside the radio. Then just replace the new mic wire and place the safety clip and screw back in place and re-connect the 3 conductor quick-connect, replace the cover and you're ready to use the radio. Good luck.
Have you tried measuring the power output of your radio? If you do, I bet you that the power output is over 4watts PEP. This could be caused by a component changing value over time. What I would suggest you do is to measure the power first to see if the power is over 4watts PEP and then proceed from there. I don't believe it's a grounding issue since the antenna being used is made for a no ground condition. Now if you are planning to use a ground type antenna, I would suggest that you not do that, only because just grounding the antenna will technically do no good, since when the say ground what they are talking about is a ground plane no just a grounding point.
Check your power and then we can start repairing this problem.
I hope this helps, keep me informed on the progress.
Check your microphone by swapping with another duplicate. If no differance, you will need a SWR meter (standing wave ratio) to find the culprit. It attaches in line of the coax and determinds power out and reflected power. The reading should be 25 watts foward and max of 1 reflected.