Bob Bob wrote:
Its all intriguing anyway! Not that I have a large enough body of water
nearby to try experimenting with it though.

I did a quick bit of browsing around and even found some experiments
done by a VK5 using 160M (http://www.qsl.net/vk5br/UwaterComms.htm) I
note he has some attenuation curves that might be worth a look at.
Although some kind of packet, PSK or other kind of digital system would
work in an SSB bandwidth the problem for the OP is that he probably
doesnt want to take a PC with him underwater! Still think a packet TNC
at 300BPS might be usable though.

I am actually here in more ways than one.. Am living in East Texas.

Cheers Bob W5/VK2YQA

nitespark wrote:
---


Nice to see folks from "VK" land here with us.

73 OM
Andy
WD4KDN

I agree Bob. Quite interesting. I was diving last weekend in a quarry
with two other divers who had wireless comm systems using full face
masks. I could hear them talking to each other but couldn't make out
what they were saying. They have been trying to talk me into purchasing
a full face mask with comm but at present, I have other financial
priorities. I guess for a very limited distance, 160 meters might work
but depending on the application, battery size and the associated tx
power would be limiting factors. The article mentioned floating an
antenna to the surface. If you were to do that, you might as well use
VHF or UHF depending on distances and power outputs, etc. For most
divers, I would think that would not be their first choice because of
entanglement issues.

If you are in East Texas, depending on where, you are getting pounded by
"Rita". Hope all goes well. Perhaps we can hook up on 20meter?

73
Andy