Frequency transmitters and receivers?

Question

I am looking for a frequency transmitter (like the equivalence of a r/c car remote) that could transmit a frequency to the receiver and the receiver would send an electrical current through a wire. is this possible? and also what transmitter and receiver could i get?

Answer 1

Well, it really depends on what you are trying to accomplish.  Any transmitter, will generally induce a current ion any wire nearby.  Granted, it's not a big received signal, but it is present.  For example, if you hook up a scope to any metal you will likely see a 60Hz signal from the power lines in your house! (Or 50Hz, if you are in Europe, for example).

That's generally a VERY low signal level, though.  So if you want to actually do something with that signal, then you will likely need a receiver, antenna, and filter for your transmitter.  Then your receiver will amplify the signal and give you enough drive current/voltage to control an actuator, for instance.  RC car, plane, et al systems pick up around 25 and 40 MHz) in a "loose" filter system and then drive actuators.  More complex RC controllers may drive a digital signal in these bands permitting your receiver to control several actuators. (Many robotic systems will utilize this approach, for greater flexibility and more channels per link).

The previous author, had it right too.  Check out your local hobby store as they will likely have a good selection and knowledgeable people.  You could also look for RC airplanes, RC boats, RC cars, remote-control for info on the web.

The "low-end" controllers are very cheap, you can usually go to a toy-store even on sale or liquidation and find simple controllers (still inside the toy) for a few dollars US.  If you are good with electronics, then you can create notch filters to narrow the response band and combine a few "cheap" controllers for a more complex system.  

It really comes down to what do you want to "control".  You may be able to purchase what you need from a hobby store, ready to go.  Be fore-warned, though, if you are creating a system from scratch, then be very careful lest your neighbor with the toy car start to control your $$$ robot sending it under a passing cars tires.

Answer 2

RC transmitters and receivers are the way to go. You can get RC receivers with different kinds of actuators, relays, etc. visit your local hobby shop, or look on line.

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