As the subject line saud "2.4 GHz over water???" No, you did not misunderstand, but others must have. Thank you John Peter Krengel wrote: >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