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AJ Lake wrote:
Bob wrote: My valve (tube - U.S.) receivers far out-perform /any/ semiconductor receiver. Your tube receivers outperform *any* semiconductor (solid state - U.S.) receiver? I guess that would mean in all ways. That's a big claim. What receivers might those be? Yes. In every way. Intermodulation, noise floor, selectivity, ultimate sensitivity, every parameter you can think of! The receivers were very carefully designed and constructed by me, (though taking advice from some of the "classic" designs), and have been widely tested against some really serious, exotic receivers! I don't need any digital processing at all. Ah, I'm getting the picture now. You are firmly rooted in the past. Not at all. I'm a professional electronics designer, and use the very latest technology when applicable. I haven't seen /any/ digital processor that assists me in actually picking signals out of QRM. I'd rather use tight filtering (RF, IF and AF), and synchronous demodulation when needed. The real trick is a receiver with extreme selectivity (not the bogus pseudo-selectivity given by digital filters with all their nasty artifacts) and a really low noise floor. Not unusual with old timers. The problem often is that we think everyone else should be the same. That's why it took so long to kill the code test. Absolutely not - I'm happy for you if you're happy with your digital Rice Box - I'd rather use something *I* made and get results that often astonish my friends and colleagues. I can "work the world" on tiny power using CW, whereas I'd have to use stupid amounts of power to get similar results with SSB. Less power needed is an advantage of CW. Also less antenna needed. I run 50 watts to a random wire 8' high (HOA stealth antenna) with quite satisfactory results. I have a loop over my garden (backyard - U.S.), which is (just) resonant on 7 Mhz and has a reasonable match on other bands. It's basically two long wires above each other, connected by a vertical section at the far end and with a transformer coupling at the house end (the transformer is 6 metres of UR 67, and the horizontal sections are about 9 metres long). It's not the world's greatest antenna, but works surprisingly well for its small size. It's not a DX antenna, though I do snag one every now and then. Me too! CW ragchewing's my game, and I seldom fail to complete a QSO. My latest game has been working on a /really/ simple and cheap frequency synthesiser and SSB generator that's not too critical in component values and easy to align. It's entirely digital! Also, the people you meet on CW tend to be much more friendly! Yes CW is a gentlemans band. Certainly is! Bob |
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