At NASA at least, we referred to everything above 1 GHz as microwave. I have never heard SHF and EHF used in practice (and I worked at 8 GHz and above for years). There are two basic dangers here - the electrical grid acts as a big radio antenna and circuit breakers may trip. - The maximum frequency at which the ionosphere reflects radio waves (the MUF - http://www.hfradio.org/muf_basics.html ) will increase. Some things that depend on ionospheric reflection may act weird, there may be interference at higher frequencies which normally do not reflect, but now do, etc. - it is also possible that dispersion (frequency depend phase changes) at higher frequency could cut down on bandwidths of broadband systems. The reflection frequency is almost never higher than 30 MHz anywhere on the planet, and the effects depend on the inverse frequency squared. I doubt that many of the bits moved by the readers of this list go at radio frequencies as low as 30 MHz. Even the cell phone and other bands starting about 700 Mhz are unlikely to be affected. Spacecraft may be effected, but this will be because they are bathed in increased radiation. There also may be some cool low latitude aurora. On Friday, October 24, 2003, at 09:49 AM, Keptin Komrade Dr. BobWrench III esq. wrote:
Well, this is more than you really wanted to know, but....
ELV Exremely Low dc - 3khz VLF Very Low Freq 3khz - 30khz LF Low Frequency 30khz - 300Khz MF Medium 300Khz - 3Mhz HF High 3mhz-30mhz VHF Very High 30mhz-300mhz UHF Ultra High 300-3Ghz SHF Super High 3Ghz - 30 Ghz EHF Extremely High 30Ghz - 300Ghz
Different folks put the breaks at slightly different places (the.g. the amatuer radio community puts the hf/vhf break @ 50Mhz and the MF/HF break @ 1.8Khz.
And, as a side note, I can't find the URL, but the US Cong is talking about pulling all the funding for the NASA space weather programs. Would mean less/no warning of this sort of stuff.
We now return you to our regularly scheduled off topic discussions
Komrade
Owen DeLong wrote:
This will not likely affect point-to-point line-of-site communications above 50Mhz. It will likely affect non-terrestrial communications and HF communications depending on ionospheric reflection. Owen --On Friday, October 24, 2003 07:15:29 AM -0400 Todd Vierling <tv@duh.org> wrote:
On Thu, 23 Oct 2003, Roy wrote:
: "Satellite and other spacecraft operations, power systems, high : frequency communications, and navigation systems may experience : disruptions over this two-week period." : : I think you will find that 802.11b and other terrestrial microwave LOS : links don't meet any of those criteria and should be unaffected.
"High frequency communications"?
We *are* talking about multi-GHz frequencies here.
-- -- Todd Vierling <tv@duh.org> <tv@pobox.com>
Regards Marshall Eubanks T.M. Eubanks e-mail : marshall.eubanks@telesuite.com http://www.telesuite.com