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[AMPS] True Or Not True #2

To: <>
Subject: [AMPS] True Or Not True #2
From: (Barry Kirkwood)
Date: Fri, 7 Sep 2001 08:24:51 +1200
By definition, from psychophysics, 1dB is the increase or decrease in signal
strength that can be discerned by an average observer on 50% of occasions.
A 2dB increase should be discernible by an average observer at any signal

Barry Kirkwood PhD ZL1DD
Signal Hill Homestay
66 Cory Road
Palm Beach
Waiheke Island 1240
----- Original Message -----
From: Colin Lamb <>
To: 2 <>; AMPS <>; at towertalk
Sent: Friday, 07 September, 2001 7:19 AM
Subject: Re: [AMPS] True Or Not True #2

> Rich asked "On HF/MF skywave, is a 58% increase in power out (2db)
> at the
> Rx end?"
> That all depends upon how you define noticeable.  If your s-meter is
> at S-9, and assuming that 6 db per s-unit is the standard, that would mean
> the s-meter would change from 54 db to 56 db - or 2 db over S-9.  If the
> variation in signal strength is greater than that due to reflection, then
> would be difficult to detect a 2 db change and not noticeable.
> However, if the signal was at or near the noise level, then 2 db increase
> could make the signal more easily read.  A 2db increase is like Christmas
> someone using a single yagi for moonbounce.
> 73,  Colin  K7FM
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