Generate 100,000 hz (100 mhz) tone?

Question

How can I generate or get an audio file with a 100mhz tone? I've tried using audacity to generate it, but it doesn't seem to go that high. I have a 100 mhz crystal oscillator. Could I use that to generate it and record it on the computer somehow?

Answer 1

Why do you want to create an audio file with a 100MHz wave?  Perhaps I can help you do what you want to do another way.

The audible range is limited to ~20kHz for people.

Also 100,000Hz = 100kHz, not 100MHz

Answer 2

You need to work on your terminology.

100 mHz is 0.1 Hz

100000 Hz is 100 kHz

100 MHz is 100,000,000 Hz

which do you want?

I never heard of a 0.1 Hz crystal oscillator, they don't go that low.

Most audio files are compressed and assume there is no information above 20 kHz, and therefore don't work in that region.

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Answer 3

First of all, 100,000 Hz is 100kHz, not 100MHz (or 100 mHz).  Most audio systems top out around 30kHz, which is the around the highest frequency the human ear can detect.

Answer 4

If your trying to use a sound card as an oscillscope for high frequencies than you going to be out of luck. The Audio card is designed to process audio frequencies (22kHz to 20Hz) and won't even detect the 100Khz let alone 100Mhz signals you plan to apply.

Same goes for the software as the digital sampling rate is at a minimum 2x the high frequency.  Input frequencies input above the sampling frequencies are subject to aliasing which will mis-report the frequency as a different frequency.

You can use your computer as an inexpensive oscillscope but you will need some hardware. Check out picotech which has been making USB oscilloscope adapters for over 10 years.

Answer 5

Can use matlab to generate just about any freq. The reason you can't hear it though is because not very many speakers work at 100khz. The inductance in the speaker will filter out anything that high, not to mention the inertia of the driver. Besides, even if you could generate it you wouldn't be able to hear it.