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Turn radio off, and press the "audio" botton until clock is displayed. then click it again shortly till you see "FM 100" on the display, press > (side arrow, now it should switch to "FM 50". long press on the "audio" to save and exit.
afterwards it should work fine.
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If you're still getting loud squelch noise but do not receive on any channel, you must check the RF from the antenna to the audio stage(not included). There must be more than just one RF stage in this radio. Let me know what you find.
That is an odd encounter, and most probably one of the R.F.I. kind. Radio Frequency Inference can be caused by many things. Sometimes it can be a nearby piece of equipment creating that much interference, that the mics could not operate. It may have been a spurious mobile radio transmitter as used with two way radio for the cops, ambo's, firies,or even a nearby Cab!! Some times faulty light dimmers can also spray RF.
To what ever end, the fact that 4 mics went down together is indicative of an external problem, and being radio mics, it would have been radio interference.
The only other thing to check is that they are UHF. there are many VHF mic systems still about, but these frequencies are now being used as part of the soon to be introduced digital TV transmission. Best check that they are UHF, The VHF type have actually been illegal for a number of years Hope this info has helped you understand your problem. I am happy to answer any questions you may have. Cheers
i recently bought a uniden bc72xlt and had no freqs. found some for my area at these sites.try www.scanner master.com*-frequency resources and home of police and call,www.radioreference.com,www.bearcat1.com,hope some of these sites help you out.