Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Highest attainable frequencies by a transmitter

  1. Apr 16, 2006 #1
    what is the highest attainable frequencie by an oscillator circuit? :confused:
  2. jcsd
  3. Apr 17, 2006 #2
    Depends on what technology is used. If you are talking about an oscillator built from a semiconductor devices then the frequency of a free running oscillator might be like 200 GHz without any frequency multipliers. With multipliers you can boost the frequency to a few Terahertz.

    Then there is what's called a photomixing, where they use a special mixer to mix 2 lasers to produce IF in the Terehertz range.
  4. Apr 18, 2006 #3
    is it possible to have an oscillator that produces frequencies in the visible spectrum or higher? if not why?
  5. Apr 18, 2006 #4


    User Avatar

    Staff: Mentor

    A gas laser is an example of a visible wavelength oscillator.
  6. Apr 18, 2006 #5
    yes, but what im trying to say is that is it possible to emmite visible light out of an antenna.
  7. Apr 18, 2006 #6
    Your eyes have antennas or cones that are of a specific lengths that resonate at red, green and blue frequencies. The wavelength is the size of the cell basically.

    You are asking what is the highest attainable frequency by an oscillator? Well, an electromagnetic wave at any frequency can be achieved by different methods.

    Gamma rays at the end of the electormagnetic spectrum are generated by a radioactive decay.

    The highest ever frequency detected eminated from cosmic rays which was a single proton carrying energy of 50 Joules.
  8. Apr 19, 2006 #7
    so theoreticaly i could build a something like a radio transmitter except have it transmit cosmic waves?:devil:
  9. Apr 19, 2006 #8


    User Avatar
    Staff Emeritus
    Science Advisor
    Gold Member

    It's true, in general, that waves of any frequency can be manufactured with methods that vary from simple RF electronics up to particle accelerators. It is not true, however, that you can use something like a simple dipole antenna to produce gamma rays.

    - Warren
  10. Apr 19, 2006 #9
    why is that?:grumpy:
  11. Apr 19, 2006 #10


    User Avatar
    Science Advisor
    Homework Helper

    Size for one thing.
    The smallest conceivable dipole is probably 2 atoms.
    Gamma is quite a bit shorter than the diameter of a single atom.
  12. Apr 19, 2006 #11
    aaaaaahhhhhhhhhhh. i see. thanks for the info fellas and/or ladies.:smile:
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook