I'm teaching myself about radio waves (I'm still very armature)I built a circuit which hooks up to my computer's RS232 serial port, it can send small amounts of text to another computer in range .But the range goes too far , so i cant really do practical experimentsand I don't have the space todo these things out side.I'm using a crystal oscillator, but i want the signal to not go further than lets say 1 meter with a 5 cm scooby wire as the antennae, so that i can mess around with different types of antenna's on small scale
Probably the easiest way is to insulate the circuits by putting them in a plastic bag or wrapping them with paper so they don't short out, then partially wrapping with aluminum foil with one end of the assembly open to let signal in and outYou can adjust the signal level by shaping the foilYou wouldn't do this with a high power transmitter, where the power will go someplace that might be bad, but for low power it is handy.
solve this for theta mgsin? μmgcos? tan[thete] mu
