Connect with us

Crystal Radio Tuning Cap

Discussion in 'Electronic Basics' started by Dave.H, Apr 2, 2008.

Scroll to continue with content
  1. Dave.H

    Dave.H Guest

  2. Bob Eld

    Bob Eld Guest

    http://www.crystalradio.net/crystalplans/xximages/vestpocket1.jpg

    Don't expect much performance out of a simple receiver like this. It has
    very poor selectivity and depending on where you live will probably pull in
    two, three or more station on top of each other and no adjustment will be
    able to separate them. Crystal sets like this come form the early days of
    radio when there were few stations, usually only one in a given area and
    cross interference was not a problem.

    Crystal sets can be fun to build for the beginner, but because their
    performance is so poor, one should not spend much money on them. They are
    usually made from junk, scrounged parts, oatmeal boxes or toilet paper rolls
    for coils and so on. Don't pay much for anything, you'll be disappointed.

    More elaborate sets have more selective filtering and can separate stations
    a little better, but no simple "tuned RF system" which is what a crystal set
    is can separate stations on the modern AM band effectively unless you reside
    out in the middle of nowhere with only one station near by. Look up
    superhetrodyne.
     
  3. Dave.H

    Dave.H Guest

    Found a much better one, with more selectivity, which is what I want.
    Only thing is, part of it is grounded to the front aluminum panel on
    the authors radio, I don't want an aluminum panel on mine, do I just
    connect that grounded section to regular ground?
     
  4. Bob Eld

    Bob Eld Guest

    I
    found a schematic of a very small crystal radio, and would like to
    Yes, If this is a crystal set with no amplification, a good earth gound is
    important to get sufficient signal. The aluminum panel ground does nothing
    so don't worry about not having it. You can drive a metal stake several feet
    into the dirt to get a ground. Modern house wiring normally has a groung
    rod driven into the soil. It is usually located near the main power panel
    and can be accessed at an any elecrical outlet on the center terminal.
    However this ground may be noisy and may introduce hum into your reception.
    Try it and see. Also, a long wire antenna will be helpful in getting a good
    signal.
     
  5. Dave.H

    Dave.H Guest

    I already have a ground rod, for my regen radio, for an antenna, I use
    my outdoor TV antenna.
     
  6. Bob Eld

    Bob Eld Guest

    On
    Actually for AM radio reception, the twin-lead TV antenna wire is acting as
    the AM antenna and the TV antenna itself isn't adding much if anything.
     
Ask a Question
Want to reply to this thread or ask your own question?
You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.
Electronics Point Logo
Continue to site
Quote of the day

-