i want to build a wireless circuit, the distance between transmitter and recever is about 50 feet.
which freequency can i choose for communication .

 

You may want to consider off-the-shelf receiver and transmitter modules. They come in several frequencies (i.e. 433 MHz, 915 MHz). You can check out the wireless remote modules at www.rentron.com.

hgmjr

 

what is shelf receiver?
in fact i'm going to build the transmitter and receiver circuit after knowing the exact freequency

 

Of the shelf means a ready one from the market.

 

This is a link to the rf wireless page at rentron's website.

Off-the-shelf is just a term used to refer to predesigned modules.

hgmjr

 

i want to build my own circuit

 

You have to use a frequency which is not used by other things (radio stations etc) as not to cause interference between their signals and your signals. I think 27 MHz will be fine because it is a frequency used in toy remote control cars.

 

sir,is there any table for distance and freequency,
is that wavelength is related to it?

 

I don't know much about telecommunications but i know that waves travel better in some materials at some particular frequencies. Now, if you want to transmit signals more far you have to increase the power of the transmitter.

 

thank you....friend(just now i saw your profile)
see you later