Re: Microwave Noise
Chris Bartram G4DGU
An interesting question, Andy, and quite complex to answer. What
do we mean by 'noise'?
Gaussian noise is the effect of random (stochastic) processes. The 'noise' generated by radio systems tends to be cyclic, albeit sometimes in a rather complex manner, but is still non-stochastic, particularly after filtering, and is thus not strictly Gaussian!
Professional transmitters - and that includes mobile phone systems - are designed to very high standards with regard to noise outputs, and usually have extensive filtering to allow co-siting of transmitters and receivers. A lot of the 'noise' from other services detected in amateur systems seems to me to be a function of reciprocal mixing, and even-order intermod taking place in our receivers. IMD2 ... is rarely considered in amateur receiver design.
Andy G4JNT wrote: