Hear how Mains Conditioning Improves your Hifi

[TrevC]

Let's hope so LindsayT after 12 pages of thread

How could such a thing be demonstrated?

 

[TrevC]

One thing I don't understand though is why, if mobile phones in this country operate at 800MHz as their lowest frequency, can we hear the noise when induced in an audio cable?

Thanks

A good question. The answer is complicated, so I will try to keep it simple. Lets say your mobile phone outputs a burst of data every second when it is going through a handshake cycle with the mast. The data burst istelf contains data pulses transmitted 100 times per second superimposed on a 800MHz carrier.

This is picked up by your amp and finds its way to the input stages. All things being equal, a 800MHz signal should be ignored, but any non-linearity in any of the components in the amp will act as a demodulator (albeit a poor one), and effectively demodulate the signal into a series of 100Hz bursts. This is then amplified and gives the 'zzt zzt zzt'.

There is a bit more than this going on, but in principle this is about right.

Thanks.

Also the Isotek thing won't affect it, because it isn't via the mains.