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Noise blankers in Amateur Radio and in commercial sound installations –
two very different animals!

Yes, noise blankers, typically called audio noise gates, are quite
common in performed music and in broadcasting.? I’ve built a number of
studios for talk radio that use several microphones feeding a mic mixer
that automatically mutes any mic that nobody’s talking into at the
moment.? Here’s a typical example:

<> of one kind I’ve
installed with great success.? There are also individual mic processors
that perform the same task along with compression, equalization, and
other voice enhancements:

<> .? I would expect to find some of these among the AM aficionados that use converted AM broadcast transmitters and inhabit 3885 and vicinity.

In PA systems they’re great at stopping feedback when a person stops
talking and a compressor might otherwise raise the gain to the point of
feedback “howling.”

These are completely different from noise blankers that we use on HF for
receive signal noise reduction.? The kind of noise blankers that reduce
ignition and similar noises typically cut off the IF or RF signal in the
receiver when a separate receiver and antenna receives the impulse noise
that we desire to be reduced.

Is there a version that works within a single receiver?? Yes, although
its effect isn’t quite a great as the two antenna and receiver version.
Info on the single on-frequency version, sometimes called a noise
silencer, can be found here:
<> .

Incidentally, they also work well for lightning static.

For typical background hiss, atmospheric static, and the like, they’re
practically worthless.

And now I’ll just fade back into the background noise!

Interesting stuff!

Mike/
K5MGR
___________________________

Mike Langner
929 Alameda Road NW
Albuquerque, NM 87114-1901

(505) 898-3212 home/home office
(505) 238-8810 cell
mlangner@... <mailto:mlangner@...>