Connect with us

Is there an easy way yo measure frequencies?

Discussion in 'General Electronics' started by beast, Feb 8, 2005.

Scroll to continue with content
  1. beast

    beast Guest

    Tesla didn't have an oscilloscope, so how did he figure out
    frequencies?

    I'm trying to make a tank circuit, but I don't have an oscilloscope.
     
  2. Marko

    Marko Guest

    Depending on the expected frequency, you could connect your oscillator
    to an audio amplifier and listen. If you're expecting a frequency in
    the range of the AM or FM band, you might be able to tune it in and
    hear it when it starts up.

    Back in the old days, people used a Vacumn Tube Volt Meter (VTVM)
    connected to the grid of the oscillator tube. When the grid voltage
    went negative (with respect to the cathode), it meant that the circuit
    was oscillating. There was also something called a Grid Dip Meter
    that was used for just this purpose.

    Marko



    On 8 Feb 2005 12:54:09 -0600,
     
  3. Jim Douglas

    Jim Douglas Guest

    My meter will measure freq from 2kHz--> 15Mhz, not very high, but maybe
    there are others that go into the range you are looking for, actually my
    scope only goes to 25MHZ!'

     
  4. ctyguy

    ctyguy Guest

    Best and cheapest is to work with the bacic formulas using Resonancefrom ,
    Resistance, inductance/inductive reactance, capacitance/capacitive
    reactance.

    I'm afraid to list any, since I have not used them for years, but they're
    accurate (or at least as accurate as pi <g>) As in 2(pi)fl


     
  5. beast

    beast Guest

    How about if I use a cheap am/fm radio to tune a circuit to one
    frequency, and use another cheap am/fm radio that I tune to the same
    frequency, and feed the tuned signal into the antenna circuit of the
    other, that would give me a cascade wouldn't it? I'm just worried
    that the amplifier circuit of the other will act to dampen the
    output, so I'm thinking of just using the tuning loop by itself, and
    have it excited by the output of the first LCR tuning loop.

    Antenna, then LCR1 output to the antenna2. I think that should work.
     
  6. Robert Baer

    Robert Baer Guest

     
  7. beast

    beast Guest

    Well, thanks for the help. The two radios only provide me with already
    made tank circuits. I can always separate the coil/cap from the rest
    of the cicuit, and use the parts can't I?
     
  8. Robert Baer

    Robert Baer Guest

     
  9. beast

    beast Guest

    Robert Baerwrote:


    .....?
     
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

-