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Amp Design Concept -- Preliminary
Jimmie D wrote:
Point to point wiring does not have to mean the birds nest constuction you describe. RF wiring could well be stamped out metal pieces mounted on Teflon or ceramic. very repeatable, very stable. It could also mean the isolted pad constuction where smalll sqares of PC board are glued to a substrate. This has proven reliable, obviously an improvement over PC board material could be found.and better mounting methods than glue. Yes, I agree with you. The problem is that these amp builders are not using the point-to-point methods you describe. From what I can see... they are gluing pieces of copper clad board (via double sticky tape) to a non-etched copper-clad board. They have no regard for characteristic impedance of trace widths (http://www.pcb123.com/help/calculators/microstrip.html). I also am not really crazy about the longevity of double-sticky tape... LOL There are two big problems I see with most amp designs. One is biasing, even the cheapest Boomer would be much improved if it had an adequae bias circuit. The other is proper setup. I doubt if someone mostly interested in how well they can make the power meter swing will pay much attention to setup instuctions. Attenuators on the front end would be a joke. How would establish proper drive for a given setup with only a cheap power/VSWR meter. Agreed, my new amplifier design (http://www.telstar-electronics.com/S...202879ABTC.pdf) now has thermal tracking class AB biasing. I also don't use any front-end attenuators. Like you say, proper setup is critical to any good station. The operator needs to pay attention to the drive requirements of the amplifier... and should adjust the driver accordingly. www.telstar-electronics.com |
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