Results 1 to 4 of 4

Thread: Just wanted to share this

  1. #1

    Default Just wanted to share this

    I never cease to be amazed when I watch videos from the old days before technology made things easy for the every day person. I've seen videos for changing a crystals frequency by sanding them or putting them in acid, I've seen wavelength and tuning measurements with a lecher line and a neon bulb, I've seen single conductor transmission lines that have less loss than coax or twin lead, and now I believe I've seen it all... An optical lens made of glass focusing RF energy!

    This particular video starts out very boring to the average wire nut, but the second half is an excellent demonstration of reflection, refraction, diffraction, and standing waves. Just thought I would share the link for those interested.

    EDIT: "The way things used to be done" is almost worthy of its own section on the forum!
    Last edited by brandon lind; Fri 9th Aug 2019 at 06:41.

  2. #2

    Join Date
    Oct 2009
    Oulu, Finland


    Oh wow, I had forgotten about those. As a kid, I used to watch the Royal Institute Christmas Lectures. If I remember correctly, they were shown on TV during the school summer holidays on BBC2.

    As for re-tuning crystals: remove the metal casing and a little bit of pencil lead (OK, graphite) would knock it down a few kHz.

  3. #3
    Super Moderator 5B4AJB's Avatar
    Join Date
    Mar 2008
    Meneou, Cyprus


    He's not a patch on Irving Finkel

  4. #4
    M0WAO's Avatar
    Join Date
    Mar 2011
    Solihull, UK & Costa Esuri, Spain


    nice one, enjoyed it
    73 de Biton - m0wao - echolink 633710
    Elecraft K2

Tags for this Thread


Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts