[CQ-Contest] Filter???????

[Robert Chudek - KØRC]

Tony,

I am not an acoustic engineer... but I will speculate the higher audio frequencies (noise) do not have as much energy content so they attenuate more quickly. Reminds me of the kids 1-KW audio amps in their cars now-a-days, you can hear the thumping bass a mile down the road.

73 de Bob - KØRC in MN


Message: 4
Date: Sun, 14 Jan 2007 08:10:39 -0500
From: "Tony Rogozinski" <trogo at telegraphy.com>
Subject: [CQ-Contest] Filter???????
To: <cq-contest at contesting.com>
Message-ID: <01dd01c737dd$634e1470$05000100 at yourbe71e130be>
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I've noticed something for years and just wonder if anyone else has the same experience?  This morning I was copying OH6AH on 40M LP but he was pretty weak and the background noise made it a little difficult.  The speaker was on and I needed to go downstairs to get something - as I descended the stairs it seemed like a filter was switched in by my brain and all the background noise went away leaving only the signal.  Just like a nifty audio filter.  In years gone by I have noticed this many times but never asked anyone about the phenomenon.  In Arizona I would be working in the yard maybe 100' away from the shack, the window would be open and radio on and I could copy weak signals without any problem.

Comments?????

Tony W4OI/HK1AR