Bluetooth signal transmission
Bluetooth signal transmission
(OP)
I have a bluetooth device that is setup to transmit data to my phone, and I am planning to use it in building a temperature sensing device in the ocean. Will this device be able to transmit a bluetooth signal through a space with the following dimensions (lxwxh): (13.5x5.0x1.5cm) to another device? The device will be surrounded by concrete except for the hole with those dimensions.





RE: Bluetooth signal transmission
Here's a good starting point.
http://www.radio-electronics.com/info/antennas/wav...
Bluetooth is in the 2.4GHz band. Wavelength about 12.5cm.
Perhaps you could couple the signal into a coax to exit the structure.
RE: Bluetooth signal transmission
Otherwise, you can put a 2.4 gHz rubber-duckie or other antenna, a short piece of coax through the opening, and another antenna placed with at least one or both of the antennas near the devices.
I used to design ISM band (915 MHz) devices made to forward propane tank measurements to a receiver connected to a phone line. On a few occasions the receiving device was located in a reinforced room where the phone line was available. Too much signal was lost going through the reinforced wall for the setup to work. The antenna-coax-antenna approach would work. This approach has its own signal loss but that loss was much less.
RE: Bluetooth signal transmission
Keith Cress
kcress - http://www.flaminsystems.com
RE: Bluetooth signal transmission
Normally the transmitter/receiver would have enough link gain to work up to 1/2 mile line-of-site. But the room was a rebar reinforced concrete tornado shelter and panic room for a house. This room was reinforced on all six sides, and the house had metal siding.
RE: Bluetooth signal transmission
Keith Cress
kcress - http://www.flaminsystems.com