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It sounds to me like the squelch needs ajusted as part of a RX alignment. Try it out for a couple of days just to make sure it's not some wierd atmospheric condition or local interference. If it continues, have it aligned and make sure and mention the squelch issue. It shouldn't be hard to resolve.
Please advise me to what is a good replacement mic for my SR-497HPC... Answer: 497 is "wired like Cobra", so many choices available. That radio does not need a power mic, so purchase a stock "coffin style" mic with a decent cord, like the ones that Astatic uses. The Superstar DM-507 is my go-to. https://www.ebay.com/itm/3050474478...adANq91JSiEEnz8EGqPJRBloTgEyaVsBoCtoMQAvD_BwE $12.99 + .99 cent shipping.
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