I've got an old concave UK BskyB dish and I would like to use it to "boost" a signal from my RF module attached to arduino. The RF module is a Jeenode type RF12, but my setup is not Jeenode it's attached to an Arduino Uno.
After a bit of research, I think I have to position the receiver module an exact multiple of wavelengths from the center of the dish to get it to work as a collector of "waves" and reflect them towards the RF module efficiently (ie so they mostly add up instead of cancel out).
Using the equation
wavelength = C / f
(C is velocity of light and f is freq of radiation) I get
3*10^8 / 868 MHz = 34.56 cm
I would appreciate an experienced look at my logic and Maths and some comment on it.
Am I on the right track?