[CQ-Contest] Minimum Discernible Difference

Randy Thompson K5ZD k5zd at charter.net
Sun Sep 5 08:06:30 PDT 2010

An interesting attempt to quantify what a few db mean!  Very clever and very

Here is my take.  You put up a stack or change from a tribander to a
monobander.  You pick up a few db.  You can do A/B tests all day long and
not tell any difference.  Then you do a contest and your score goes up a few
percent.  Hard to tell where that extra db or two makes a difference, but it

Randy, K5ZD

> -----Original Message-----
> From: cq-contest-bounces at contesting.com 
> [mailto:cq-contest-bounces at contesting.com] On Behalf Of David Gilbert
> Sent: Monday, August 23, 2010 6:05 PM
> To: cq-contest at contesting.com
> Subject: [CQ-Contest] Minimum Discernible Difference
> I've created a web page that documents my rather clumsy 
> efforts to investigate how much difference in signal strength 
> might be noticeable in weak signal and/or contest conditions, 
> with several audio files included as illustration.  Please 
> don't consider any of it to be authoritative since I am not 
> an audio professional, but maybe some of it will be useful to someone.
> http://www.ab7e.com/weak_signal/mdd.html
> 73,
> Dave   AB7E
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