stationary radio hydrophone

[olga filatova <>]

Could anyone give me advice about making a stationary radio
hydrophone? The hydrophone will be placed 500 m away from the receiver
(the receiver is on the shore). The main questions are these:

1. What batteries I should use to provide the longest time of
continuous autonomous operation by the hydrophone and transmitter? The
local condions make battery replacement very difficult, so ideally I
would like to have some energy source which can work for a month
without replacement.

2. What type of transmitter is better for this purpose? Are there any
off-the-shelf devices which can be used for this?

Any other advice will also be greatly appreciated.

Thanks in advance!

Olga
___________________________________________
Olga A. Filatova, PhD
Department of Vertebrate Zoology
Faculty of Biology, Moscow State University
Vorobiovy gory, 1/12
Moscow 119992 Russia