"Roy Lewallen" bravely wrote to "All" (17 Dec 05 12:44:06)
--- on the heady topic of " Underwater"

RL From: Roy Lewallen
RL Xref: core-easynews rec.radio.amateur.antenna:221425

RL The attenuation of a radio signal through water is staggeringly high
RL except at extremely low frequencies. Fresh water is lossy for two
RL reasons: one is that the polar molecules attempt to align themselves
RL with the oscillating electric field. This physical motion results in
RL loss.
[,,,]

Thanks for the info. I had read that submarines communicated in a
band of a few 10's of Hz because of the problems with water. As for
the polar molecules aligning themselves, this implies it takes some
time to achieve. Thus there is a resonnant point in this and if there
is resonnance then there might be anti-resonnance too. Might you know
where this natural molecular resonnance is? Might this be the standard
microwave oven frequency?

A*s*i*m*o*v