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I would greatly appreciate some guidance on making an RF Gain circuit for my back up radio, a Realistic TRC-440. I can email schematic, but would have to scan the document. Thanks!
It's obvious to me that the Teddy has a different version of the 505 board. Although the Teddy doesn't have an RF gain,it has power and modulation adjustment points on it whereas the 505 can only benefit by adjusting L205 and spreading L203 and using a good power mic
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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