Topband: Diversity RX audio example

[m.r.c.]

Hi Steve

brief list of your RF/AF gear, please?

K3 dual RX at least, I am guessing


Thanks

Robin WA6CDR


----- Original Message ----- 
From: "VE6WZ_Steve" <ve6wz at shaw.ca>
To: "topband" <topband at contesting.com>
Sent: Tuesday, February 05, 2019 15:44
Subject: Topband: Diversity RX audio example


> Today I decided to play with some of my recorded 160m QSOs from this season (I record almost all of my 
> QSOs).
> I did a few experiments with isolating my diversity RX antennas to try and hear the benefits of having 
> a different antenna in each ear.
>
> Because I record all of my QSOs in stereo, I was able to isolate each RX antenna and listen to them 
> individually, and then together in diversity mode.
>
> There are many other references to the benefits of using Diversity RX, but for those who have never 
> tried it perhaps this one example will provide an example of the diversity magic.  However, this 
>  “magic” although almost always improves copy and intelligibility, it's only on the ***very*** weak 
> ones….think ESP…when it really shines and this is the example I provide the audio link to.  Please be 
> aware there is no point at all listening to this sound-file without headphones because you wont get the 
> diversity “brain filling magic", and also the signal is so weak you wont hear anything.  This is a 
> typical “just bubbling above the noise” 160m signal.
>
> My edit method was to take the stereo recording and cut out the left channel (Beverage) and right 
> channel (9 circle RX array) and splice them sequentially after the stereo recording of both channels.
>
> The recording is of a QSO with Vlad RA4LW via the polar path and my edited clip goes as as follows:
>
> CQ DX (vlad answers) RA4LW RA4LW (i respond) RA4LW 449.
>
> This is repeated 4 times: 1.) Diversity, 2.) Beverage only, 3.) 9 circle only, 4.) Diversity again.
>
> I have selected this example because it is one of the best I have were I do NOT think it is possible to 
> copy Vlad's call on either of the RX individually, while somehow, when they are heard together, the 
> call gets “put together” and is copiable.  google link below and your sound player should play it.
>
> https://drive.google.com/file/d/1NbFLFw2BRHC9DGfxJVfhnrBOx5ViD_4b/view?usp=sharing 
> <https://drive.google.com/file/d/1NbFLFw2BRHC9DGfxJVfhnrBOx5ViD_4b/view?usp=sharing>
>
> On signals that are stronger, the diversity effect can help when one antenna goes way down below the 
> noise and the other comes up.  Sometimes it can almost make you dizzy as the signal goes from ear to 
> ear.  I have noticed this mostly on 80m when using the 2 el Yagi and Beverages in diversity.
>
> 73, de steve ve6wz.
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