Quote:
Originally Posted by Rainbow Six
I know absolutely nothing about this subject, but I think both Jimbo4795 and HorseSoldier are suggesting that even in the absence of satelites it would still be possible for commanders in the US to speak to units overseas?
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Basically, some radio wave frequencies are able to bounce a signal of the upper atmosphere one or more times, extending their range. This isn't exclusive to the High Frequency (HF) range, but that's the one that people mostly concern themselves with, since it's the one that really gives range and, with a suitable radio set up and atmospheric conditions you can talk to anyone on the planet with an HF radio. None of this stuff is particularly high tech -- it's early 20th century tech and stuff that Ham Radio guys do in their garages, so even post-nuke people would be able to build or adapt existing radios.