Ooops....did I missunderstood your question? Did you like to set the antenna of the small boat UNDER water? That sure doesnt work. As somebody states earlier 2.4 Ghz (about) is der frequency of resonance of the water molecules! Anyway, any high frequency will not work under normal sea water (if you use destilled water it works). Therefore in military (i.e. submarines) ultrasonic is used as a carrier frequency. All what you need is two special under water speakers and microphones (and of cause transceivers). But there is one disadvantage using this. As you have to transfer datas the usuable transfer rate will be rather low. So using any VHF oder UHF frequency will be the best way to solve the problem. Peter DG4EK ----- Original Message ----- From: "VULCAN20" To: "pic microcontroller discussion list" Sent: Tuesday, January 24, 2006 10:02 PM Subject: [EE] 2.4 GHz over water??? >I am not knowledgeable with radio waves. I was thinking of a project > using the Maxstream xbee Zigbee pro radios. I need to send data from a > small rc boat to a larger full size boat about 1000 M distance. > The big boat will have the ant about 3 to 4 M above water. The small > boat I would like to have as low as possible. I asked an old ham radio > person about it and he said It would not work due to freq. and height > above water. > I e-mail Maxstream and all they would comment that it depended upon the > height above water and would not suggest min height required. > Any thoughts on this? > > Any other radios that could be used? Requirements: about 1000M over > freshwater, wave height less then 1M., > the large boat would send signal to start data collection. Then when > small boat had data it would send it back to larger boat. > > Thank you very much? > John > -- > http://www.piclist.com PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist > -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist