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To: Jeff Vayda who wrote (32989)	6/23/1999 1:23:00 PM
From: JohnG	Read Replies (1) \| Respond to of 152472

Rewards@180 ft--You've got a 5 min no-decompression limit if ya had the air & if you are a young healthy Seal. And a limit on subsequent dives. How much fun can you have in 30 sec at 180 ft. I'll stick w/ my 2001 95's--much better reward at 180. John G

To: Jeff Vayda who wrote (32989)	6/23/1999 1:34:00 PM
From: LindyBill	Read Replies (1) \| Respond to of 152472

Anyone know the propagation abilities of cellular underwater Hmmm... I seem to remember that CDMA came out of the Navy's attempts at underwater communication.

To: Jeff Vayda who wrote (32989)	6/23/1999 2:16:00 PM
From: Sawtooth	Read Replies (1) \| Respond to of 152472

<<I might have to buy an Iridium phone and waterproof it if I am going to be spending much time out and in the open ocean!>> Ir...Ir...Iridium!?! You have blasphemed, Mr. Vayda. Tsk-tsk. (Or, "bubble-bubble" to you divers.) ; )

To: Jeff Vayda who wrote (32989)	6/23/1999 6:45:00 PM
From: Scott Overholser	Respond to of 152472

>>Anyone know the propagation abilities of cellular underwater? << electromagnetic radiation propagates through saltwater (a conductive medium) really crappy. it's been a long time since i've done this but as i recall, the signal strength is inversely proportional to some product of the depth and frequency of the em radiation in question. basically that means high frequency communications are completely out of the question. as i recall, the navy used to trail 5-mile long wires behind subs that would transmit at absurdly low frequencies like 100hz (that's 100 hertz, not mega, not kilo) or less. that's the only way to get a signal out of the water. i think 800mhz would be out of the question in a submerged unit.