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Chat => Chit Chat => Topic started by: Weaver on May 25, 2018, 05:46:51 AM

Title: Wide-band interference source
Post by: Weaver on May 25, 2018, 05:46:51 AM

Can some devices generate a load of interference over a very wide range ? For example enough to stuff up > 2 MHz worth of spectrum ? Or 20 MHz worth?

Title: Re: Wide-band interference source
Post by: roseway on May 25, 2018, 07:07:53 AM

Anything which sparks, e.g. unsuppressed vehicle ignition systems.

Title: Re: Wide-band interference source
Post by: Weaver on May 25, 2018, 07:14:35 AM

Any idea how wide?

Title: Re: Wide-band interference source
Post by: roseway on May 25, 2018, 07:31:51 AM

I'm not sure there's a general answer to that, but I'm no expert.

Title: Re: Wide-band interference source
Post by: Weaver on May 25, 2018, 07:53:14 AM

In your experience, many bins wide, ie n × 4.3125 kHz perhaps where n is something substantial ?

Title: Re: Wide-band interference source
Post by: roseway on May 25, 2018, 08:05:29 AM

Sparking produces wide band interference which can potentially range from a few hertz to a few gigahertz. But I repeat, I'm no expert.

Title: Re: Wide-band interference source
Post by: Weaver on May 25, 2018, 08:20:59 AM

A square wave or step function has a Fourier transform with components going on up for ever of course, as 1/f iirc. So it will extend some way up.