[Amps] Getting rid of blower noise

[Robert B. Bonner]

Funny you should mention this Colin,

I'm working on amplifiers powered by ANTI-MATTER...

If we can achieve this, ANTI-NOISE will be a walk in the park.

*** Seriously (yeah right), you need a condenser microphone on a tripod 3
feet from the affront of your amp.  A mic amplifier, a phase shifting
network, an audio power amplifier and speakers all bolted into the amp rack
next to the RF power amp...  

When at full power adjust the phase shifting network until the amp is
silent.  Total BOSE system for your amp.  It would probably neutralize choke
talk and everything.  Dead silence.

The trick will be keeping the RF out of the AF amp.  

BOB DD

-----Original Message-----
From: amps-bounces at contesting.com [mailto:amps-bounces at contesting.com] On
Behalf Of k7fm
Sent: Tuesday, February 20, 2007 9:19 AM
To: Manfred Mornhinweg; amps at contesting.com
Subject: Re: [Amps] Getting rid of blower noise

I have another suggestion - or more correctly called "fighting noise with 
noise".

WARNING:  this is one of those ideas that would come out after a few hams 
with big amplifiers were sitting around during the low sunspot cycle 
imbibing, and is not based upon research or special knowledge:

Since big amplifiers need air and air movement necessarily makes noise, one 
approach would be to simply make the noise invisible by picking up the noise

and generating out of phase noise to cancel out the actual noise generated. 
What you cannot hear would not be objectionable.  In aircraft, we use noise 
candelling microphones and headsets.  The announcers at noisy events speak 
into the microphone with almost no interference from the loud noise at the 
event.

So, what we need are noisy fans which generate anti-noise.

Colin  K7FM 

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