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Re: Poor receiver sensivity(25uv) This unit is out of...
How do you know its sensitivity is 25 microvolts? have you checked the antenna connections to make sure they are clean and tight? If there is no problem with the antenna/lead in section,i would check the power supply voltage to see if its right and then the first rf amp, which is probably an field effect transistor near the antenna,they are often damaged by static charges.
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Just about any electronics/radio shop can repair your scanner, but for the best job with factory trained technicians, factory parts, and a repair warranty, you can take the unit to any Radio Shack and they will either have the job done locally or send it in for factory repair.
Sounds like you fried something by reversing the polarity. Repair will likely be expensive, but check with the manufacturer to find out if they have a flat-rate service charge, if so they will most likely replace it with a refurbished scanner.
receiver alignment is beyond what you can do unless you have a good signal generator and scope and the knowledge needed to understand the circuitry and the test equipment, you will need a tech to do this job.
This is just a guess but sounds like your antenna connection (inside the unit) has broken. If you use the antenna as a handle it will eventually break. Radio Shack will repair it for a flat fee of $40 (that was the price the last time I checked) plus shipping. Or if you are really good at soldering and have good eye sight, you can repair it your self. Your local radioshack should be able to send it in for repair.