[ScanIndiana] The Frequency Spectrum

[David L Norris]

On Wed, 2002-07-03 at 13:18, Tom_C_Robison@raytheon.com wrote:
> UHF = 225 to 800 Mhz
> VHF = 54-224 Mhz
> HF = 30-54 Mhz
> The HF band is generally considered to 30-54 Mhz

I've never heard anyone claim 30-54 MHz as part of HF.  It's generally
called "VHF Low Band"  But, sometimes commercial "Low Band" equipment
will cover 25-54 MHz which does include a portion of HF freqs.

> Thats a brief, rudimentary explanation of the radio frequency spectrum.

Certainly not to nitpick...  But, these terms are defined by ITU and
probably every other accepted communications authority.  They aren't
opinions at all.

US NTIA via the GPO has an excellent printed wall chart entitled "United
States Frequency Allocations: The Radio Spectrum" which shows every
frequency allocation in the US divided into subbands from VLF-EHF. 
Those subbands are defined like this:

VLF (Very Low):     3 KHz -  30 KHz
LF  (Low):         30 KHz - 300 KHz
MF  (Medium):     300 KHz -   3 MHz
HF  (High):         3 MHz -  30 MHz
VHF (Very High):   30 MHz - 300 MHz
UHF (Ultra High): 300 MHz -   3 GHz
SHF (Super High):   3 GHz -  30 GHz
EHF (Extra High):  30 GHz - 300 GHz

Here's a neat article from HowStuffWorks!:
  http://www.howstuffworks.com/radio-spectrum1.htm

Here's an excellent chart from the NTIA (the agency who allocates the
freq spectrum in the US; FCC, GAO, DoD are the recipients of NTIA
allocations)
  http://www.ntia.doc.gov/osmhome/allochrt.pdf

Here's a nice chart from the Australian Communications Authority which
shows Australian bands!
  http://www.aca.gov.au/frequency/arsp-wc.pdf

-- 
 David Norris
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