RadioBanter - View Single Post - improve S/N for AM car radio by a factor of 2...5...10?

Roy Lewallen · January 20th 09, 03:48 AM posted to rec.radio.amateur.antenna

wrote:

Is there anyway to "filter" the 810 frequency somehow?

The noise is also at 810 kHz.

Noise can sometimes be separated from a signal at the same frequency if
there's some distinguishing characteristic of the noise, like fast rise
time or a periodic nature, so it can be selectively removed. One device
that can do this for a few special noise types is a "noise blanker".
Modern audio signal processors (or "digital signal processors" - DSP)
are considerably more sophisticated and can remove a wider range of
noise types. But good ones aren't cheap, and probably not easily adapted
to your radio. And they do best when the incoming S/N ratio is
reasonable. You'll be encountering a pretty wide range of noise sources
as you drive along, so I doubt that any kind of processor would be very
successful at removing all, or even a substantial portion, of them.

Roy Lewallen, W7EL