Batboard

About 6 months ago our work Dispatch Center Suffered a Major power failure and power was lost to our EF Johnson Base Station 900Mhz Radios. When the power came back online when the radios TX is pressed there is a Very Strong and Loud HUM on the Signal and the Audio of the Dispatcher is Low…Attached is a clip of the Audio…Can anyone guess what Happened…Solution would be to replace Radio all together but would like a possible fix if there is one..

Audio here

https://drive.google.com/file/d/0B7RhHE ... sp=sharing

Bad power supply, the first thing to check. If it is buzzing that loud, you should see AC ripple on a AC voltmeter.