[TowerTalk] Fwd: Re: fading and the value of 1 dB

[David Gilbert]

It actually wasn't all that clever.  I should know ... I was the one who 
did them.  ;)

http://www.ab7e.com/weak_signal/mdd.html

73,
Dave   AB7E




On 5/18/2022 1:53 PM, Mike VE9AA ve9aa at nbnet.nb.ca wrote:
>
>
>          A few years back there was someone who did a clever 
> experiment and posted CW recordings and they were all 1 or 2dB signal 
> levels apart.
>  I don't know who or how that was done, but when I listened to them, 
> for sure I could tell the difference most of the time
>  in 2dB's of difference and given enough time, often I could hear 1dB 
> of difference.
>   - - -
>  As a "test" I have tried in one contest, some years ago calling 
> stations at very low output levels here. 1watt or 1.5w I think I tried 
> and often, no reply. Not even a QRZ. Then I called again and I upped 
> it to 2 or 3 watts (I forget exactly) and often got a QRZ and 
> sometimes only then was a QSO made.   Not exactly scientific, I know...
>
>  My QTH is (typically) very quiet, in rural NB, Canada more-or-less on 
> top of a nice hill far from the nearest city and a LOT of times I may 
> call a very weak station (full QRO here) and not get a reply.  
> Obviously they have a higher noise level than I do. How much more, I 
> have no way of knowing.
>
>  The takeaway:
>  Every dB counts.
>
>  I have worked loads of EU on 10m and for hours on end at super weak 
> signal levels and rarely been spotted by the RBN on those days.
>
>  Mike VE9AA
>
>
>
>
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