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March 1st 04, 08:54 PM
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Stephan Grossklass wrote in news:c206ff$rgp$05$1
@news.t-online.com: schrieb: My own understanding of a digital radio - only the keypad and the frequency display is digital and all the rest is analog . Pl. correct me if I am wrong . Add the digitally controlled frequency synthesis via PLL to that. (Only simple receivers use analog synthesis plus a frequency counter these days.) But apart from that, the signal path from the front end over the mixing, filtering, demodulation and output is indeed completely analog. This is why a 40..50 year old tube equipped Collins boatanchor like the R-390A can still keep up with good receivers today - it was built to the highest standards of the time, and that is still pretty good even today. I have several modern-era tabletops that I'm happy with at the moment but came across a real delight this weekend (all right, not a Collins, but someday, perhaps....) A local pawn shop that specializes in restored vintage radios had a very nice Blaupunkt from the fifties, the Paris model (type 22153), in a beautiful wooden case. Other than needing a new dial lamp it's working perfectly. AM and FM sound great but the real treat is the SW band (5 - 13 mhz). This thing has a huge speaker (compared to what I'm used to) and a deliciously mellow tone courtesy of the tubes. Radio Sweden on 9495 Saturday evening sounded like a strong, local AM broadcast; the BBC and Radio Netherlands were an audio delight. What surprised me was how little drift there was (none that I could tell) and how little propagation flutter there seemed to be. This is with only about 25 feet of magnet wire about ten feet in the air hooked to the antenna outlet. Old technology has its surprises, all right. ---- |
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