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  1. AHC: Inside start grooving standard on microgroove records from the beginning

    Right from their introduction, it was standard practice to cut microgroove masters from tape sources. Suppose that they also had inside start grooving instead of outside start, being cut in reverse from master tapes. Have any of you noticed that albums originally released as L.P records have...
  2. Modulated tape bias in the analog era

    What's so complicated about modulating bias? It's just a simple matter of detecting the amount of self-bias in the signal and adjusting the added bias accordingly. Bias is only needed when recording, not when playing back tape. Before Dolby HX, there was a long period of debates about how much...
  3. Modulated tape bias in the analog era

    When sound was first recorded on magnetic tape, it was discovered that extreme distortion would occur due to an intrinsic property of magnetic tape called hysteresis. Did anyone at the time ever notice that the amount of distortion due to this varied according the amplitude and frequency...
  4. Fuel Injected World War II Tank Engines?

    Diesel fuel injection systems were also mechanical, but diesel engines have a narrower speed range. Germany's Borgward group apparently tried direct fuel injection on two-stroke petrol engines in the Goliath and Gutbrod cars. This avoided fuel leaking out the exhaust as happens in carburetted...
  5. Fuel Injected World War II Tank Engines?

    Fuel injection, purely mechanical in those days, was more expensive and less reliable. However, could use of fuel injection in those tanks allowed for an increase in the civilian fuel rations?
  6. AHC: Television distributed by cable right from the beginning

    I don't fully understand what you are saying, but it seems that your country did get cable T.V in some places less than a decade after I.T.V began. 625 line systems did exist in the 1950s, but they weren't in the U.K. Once again, advertising models have the problem of turning a television...
  7. AHC: Television distributed by cable right from the beginning

    Well, even in the beginning, it would have been an advantage in terms of future-proofing. Maybe it is if you are future proofing the system. One advantage of cable broadcasting that others here keeping overlooking is that it provided a way of independent broadcasters to keep people accessing...
  8. AHC: Television distributed by cable right from the beginning

    Although radio was mostly heard in the living room back then, it has always been a mobile medium. I believe that car radios and even radios on board other moving vehicles date back to the 1920s. Radio always had the potential to be heard in places where cable reception was impossible, such as...
  9. AHC: Television distributed by cable right from the beginning

    I'm not sure what "pay to have your house required if you wanted to buy a TV" but don't forget that many countries outside North America already had radio licences. What if only the public broadcaster's channel(s) were over the air. Ah yes, there were wired "radio" networks before television...
  10. AHC: Television distributed by cable right from the beginning

    Re: Geezer rant Are you in the U.K? If you get frequent weather impacted degradation and they claim it's not possible, that's false advertising and they could be sued for that. Re: On the second paragraph First of all, don't spill your alphabet soup, you used OTL twice, and you don't put full...
  11. AHC: Television distributed by cable right from the beginning

    Do you mean companies like Foxtel and Galaxy? Wouldn't less technical performance than advertised be false advertising? I don't get the second paragraph. But I should note that John Logie Baird, who was involved in the development of "radio with pictures" did advocate 1000+ line television...
  12. AHC: Television distributed by cable right from the beginning

    Actually, similar infrastructure was already in place for the telephone network. And cable television does not need as much infrastructure as telephone networks. It may require more construction work in the beginning, but once it's done, there is more bandwidth available for both resolution...
  13. AHC: Television distributed by cable right from the beginning

    Has anyone here ever wondered why most television broadcasts in the world are distributed by radio waves, and originally all television broadcasts were? If you think about it's as follows; Unlike radio, television (actually the latter was called radio with pictures when it was developed) is not...
  14. active phono-catridges

    The benefit is quite simply that the cartridge doesn't have to do nearly as much work, and so can work with less tracking force, and the signal output can also be higher. The strain gauge was invented in the 1930s but seems to only have been applied to phono-cartridges since the 1970s. Is there...
  15. A complete difference engine in the 1820s

    Do you mean something that mechanical odometers have? See below. So it would now be an electromechanical computer. What is the "fidelity" of operation? This is a digital computer. No mention was made of whether the difference machine was designed as binary or not. I can think of another...
  16. A complete difference engine in the 1820s

    It is indeed about alternative history. What are the "three ships of line"? Yes, had this machine been complete, it would have been hard work which paid off before personal computers. No comment. What "guts"? No comment on the rest of this. I don't quite get this. I didn't think a...
  17. A complete difference engine in the 1820s

    The first computer ever designed, a mechanical one, was designed by Charles Babbage. Called the difference engine. What if either the difference engine, analytical engine or even both had been completed?
  18. AHC: Lorrenz cipher still unbreakable

    And the second world war would have gone on for longer.
  19. Colossus the code maker

    Yes @Stenz, cracking the code based on context.
  20. Colossus the code maker

    But Colossus was certainly the first programmable electronic computer. Even the Z3 was electromechanical. How could a code breaking computer be incapable of code-making?
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