View Full Version here: : Electromagnetic Spectrum Chart
29-06-2009, 01:10 PM
I made this chart a while ago to help me to come to grips with the various bands in the EM spectrum and to visualise wavelengths and frequencies.
The wavelengths were gathered from a couple of different sources ( I think Wikipedia ranked pretty high in the sources:P) so there may be some dispute over some values.
It's set up to print as an A3 sheet for a poster for the Obs, but yuo should be able to porint it on A4 and still be legible... just!
If you would like I can zip and post the original Excel workbook.
02-07-2009, 04:43 AM
Thanks for this, It is quite useful, and I have no real dispute with the values you have quoted.
Please post the Excel sheet, as that could be useful as a general reference.
Thanks for posting this Al! :)
02-07-2009, 08:10 AM
Here's the Excel workbook.:)
02-07-2009, 02:03 PM
Interesting that you have the category of microwaves starting from 1m wavelength or 300MHz. It may be a pure definition, but I havent heard any in the radio business refer to sub 1GHz wavelengths as microwaves. Usually 300MHZ to 1GHz wavelengths are referred to as UHF.
02-07-2009, 04:43 PM
I knew it!:whistle:
Feel free to correct the Excel workbook and repost it if you feel strongly about it.;) It could be a wiki-document in its own right.:whistle:
02-07-2009, 10:58 PM
In Remote Sensing microwaves are defined to be in the range 1mm to 1m wavelength, which signals penetrate the atmosphere in almost any conditions. Yes the range includes some radio frequencies. I think it's not so much a pure definition as a different one based on a different criterion.
03-07-2009, 08:00 AM
I'm sure the boundaries of a lot of the bands are blurred for various reasons.:P
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