Putting radio next to computer monitor gets feedback?
Kevin asked:
Apparently, computer monitors emit EMF (electromagnetic radiation.) To test this, I put a generic radio on a frequency with no talking (just random noise) and put it next to my computer monitor. Immediately, there is a screeching sound. Why?
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practically all electronic devices produce some sort of EMF. devices such as switching power supplies, CRTs etc produce considerably more than the rest of the pack. signals produced by those devices are usually lower frequency than used by commercial radio. however there is another thing called harmonics. signals that are not perfect sine form are actually sum of several (often many) signals that are multples of original frequency f (harmonics are 2f, 3f, 4f, etc.).
the higher frequency components are weaker but can reach significantly higher frequency, which is something your receiver will pick up. in prnciple signals with sharp ‘corners’ (triangle, sawtooth, square) will have many harmonics. Iby K
Most likely you are receiving the stray EM radiation from the monitor. Feedback is probably not involved at all. Frank N