transmittter circuit

[vignesh.baskar]

i need a transmitter circuit which would work even when it is in the water.. please give me any ideas or redirect me to the sites.it s urgent

 

[audioguru]

A radio controlled toy submarine stops working when it is deeper than only 1m.

 

[Vizier87]

probably GSM modules might reach deeper?

 

[BrownOut]

Sound travells great through water. I always thought it would be interesting to try an ultrasonic transmitter for deep water control.

 

[Vizier87]

Like sonar? It'll be nice if they can simulate that mysterious shark's ability to smell blood miles away through electronics.

 

[mneary]

In the US, GSM is at a fairly high frequency (900+ MHz??), making them useless at an even more shallow depth than conventional RC modules (72-75MHz).

If you're thinking about the service in the US called FRS and GMRS, they are in the 460MHz area, but I don't think remote control is allowed.

 

[Hero999]

Radio can travel through water but you need to use a very low frequency: 50kHz is often used for communication with submarines.

Sound is much better so a hydrophone is more commonly used.