Hello Everyone,
I'm looking to understand the limits and best practices (if they exist!) for RF transmission in freshwater at one of the follow frequencies 433MHz, 915MHz or 2.4GHz and using a ZigBee, LoRa or Xbee like device. One transciever's antenna will be underwater no more than 1 meter depth (more likely 0.5 meter) and the other transciever's antenna located in air about 1 or 2 meters above the water. The total range is 50 to 200 meters. The units will always remain upright however they may move around so would a vertically oriented dipole antenna be a good choioce? Ideally we'll like to use a 1/4 wave antenna with ground plane for the underwater side. The air side can be a 1/2 wave dipole antenna. We ran a test using two 900MHz radios with 1/2 wave dipole antennas 2 meters off the ground. It worked over 500 meters outside in air with a couple houses and some trees in the way. Any thoughts on how the same radios and might do in the described setup at the 3 frequencies?
Thanks,
Chris