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Electronic curiosities

Discussion in 'Electronic Repair' started by David Nebenzahl, Jan 16, 2011.

  1. No engineer would design a ham transceiver that
     
  2. Baron

    Baron Guest

    Jeff Liebermann Inscribed thus:
    Good Grief ! If William started a search for "perpetual motion" he'd
    dissappear under a mountain of hits.
     
  3. On 1/16/2011 3:38 AM William Sommerwerck spake thus:

    [me said:]
    Hint: I don't use smiley faces.

    Of course math is essential to understanding electronics. I'm OK with
    algebra and trig, but have problems with calculus, even though I have a
    basic understanding of it (differentiation, integration, etc.).

    Maybe in the next lifetime ...


    --
    Comment on quaint Usenet customs, from Usenet:

    To me, the *plonk...* reminds me of the old man at the public hearing
    who stands to make his point, then removes his hearing aid as a sign
    that he is not going to hear any rebuttals.
     
  4. Phil Allison

    Phil Allison Guest

    "David Nebenzahl"
    ** Only one error.

    A basic superhet has two stages of filtering ( RF and IF) followed by one
    stage of detection.

    ** To shift the modulation down to base band - silly.

    ** Yep - that is exactly how it works.

    In the case of an AM receiver, the original carrier can be extracted and
    then mixed with the original AM signal to recover the modulation. Some
    hi-fi AM tuners worked this way.

    ** The you would be justifiably shot.

    Cos that describes a TRF receiver.


    ** Bob Dylan wrote a song about people like you.



    ...... Phil
     
  5. Phil Allison

    Phil Allison Guest

    "David Nebenzahl"
    ** Don't think DCR works with FM.



    ...... Phil
     
  6. Another book (which I frankly don't like as much since
    Hint: I don't generally assume they're there, unless I see them. As an
    extremely sarcastic person, I rarely fail to see sarcasm when it's present.
    Don't complain that I missed something that wasn't there.

    Calculus is pretty simple -- if you have a good book. I can't recommend any,
    because I don't know any off the top of my head. (Recommendations, anyone?)

    I took calculus in high school 45 years ago, at a time when very, very few
    high schools in the US offered it. We were given a book to study over the
    summer, which carefully walked the reader through the basics of the
    differential calculus. When we got to class in the fall, we a preliminary
    understanding under our belts.

    You also need to learn about Laplace transforms. They make it possible to
    analyze circuits with simple algebra, rather than differential equations.
    Very, very handy.
     
  7. Adrian C

    Adrian C Guest

    Nah, plenty to read in this one :)

    I wonder if you are aware of this collection of US Navy training
    manuals. Looks pretty well written, and only written 13 years ago so
    relatively recent.

    http://www.rarmy.com/coleman/neets/index.html
     
  8. On 1/16/2011 3:14 PM William Sommerwerck spake thus:

    [I wrote, which for some reason William failed to attribute:]
    I took one semester of calculus back in college and still have the
    textbook, a giant tome that's pretty good: /Calculus and Analytic
    Geometry/, Edwards and Penney. Didn't do too badly in the course, but
    that was a while ago ...
    No doubt. Wouldn't hurt to know Fourier analysis either, and I'm sure a
    bunch of other techniques.


    --
    Comment on quaint Usenet customs, from Usenet:

    To me, the *plonk...* reminds me of the old man at the public hearing
    who stands to make his point, then removes his hearing aid as a sign
    that he is not going to hear any rebuttals.
     
  9. Tony Matt

    Tony Matt Guest

    The Realistic TRF (12-655) radio was sold into the (IIRC) mid-80s:
    http://www.radiomuseum.org/r/radio_shac_realistic_long_range_trf.html
    This link indicates that it was actually a superhet with an RF stage; I
    was under the impression all these years that it was a solid state
    analog to an AK-40 or similar. Oh well.

    TM
     
  10. Fourier analysis is worth understanding on a theoretical level, but actually
    performing the analysis is something that's commonly left to computers.
     
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