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Subject: radios in MOUT
Efra    12/11/2005 1:21:28 PM
Could anybody explain me why UHF or High-VHF are better than military VHF (30-70 KHz) in MOUT operations?
 
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Carl S    RE:radios in MOUT   12/12/2005 6:12:31 AM
I was told in comm class: The higher frequency radio wave filters through the aggregation of objects that block longer wave signals.
 
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Mike From Brielle    RE:radios in MOUT   12/13/2005 10:33:37 AM
Frequency is inversly proportional to the wavelength of the signal. Therefor the higher the frequency of the signal the shorter the wavelength which, as Carl S points out, means that the signal can squeeze into tighter places so to speak and take advantage of a greater number of avenues of approach to and from your and your co-communicators radios. Longer wavelength signals tend to propagate better over longer distances due to there being more energy under the wavelength and also because of certain characteristics of atmospheric propagation that tend to make them bend along the surface of the earth.
 
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TrustButVerify    RE:radios in MOUT   2/2/2006 9:18:13 PM
Also important is the tendecy of lower frequencies to be absorbed or attenuated by with "urban" matierials (like concrete) whereas higher frequencies behave in a more light-like fashion, and are reflected with less loss. Additionally, higher frequencies are generally limited to line of sight (LOS) and are less likely to be propagated over long distances by ionospheric reflection. (AKA "skip") This is handy for two reasons- one, you're less likely to be eavesdropped on, two, you're less likely to have cross-interference with someone thousands of miles away. The real fun starts when stuff like aural propagation and sunspot activity gets involved, and your VHF/UHF signals get intercontinental skip ANYWAY! Then taxi drivers in California start talking to folks in Africa and scanner nuts in Tuscloosa can hear tankers in Saudi Arabia. (For instance, recall the radio troops in "We Were Soldiers" catching traffic from Viet Nam back in the States.) One other thing- higher freqencies allow higher data rates, which in turn allow better digital modulation and encryption techniques like DAMA o Motorola ASTRO.
 
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