[UK-CONTEST] 6m multipath

[Darren GØTSM]

Shame you didnt record it then you could work out roughly what 
distance the sigs are being reflected back at by looking at the file 
in a sound editing program (50wpm cw is easier to look at). , I think 
it is 6.5ms per 2000km SpE hop (x2 to get the reflection back), 
running QSK my mp would never hear my own 1 hop 13ms echo as it's 
still returning to rx... I cant remember what the pro2 did but it was 
a lot quicker than my declicked mp's 18ms...

Those were the days, 12M in 2000/2001 you could send a dit and hear 
it's trans-global multiple echo disappearing into the noise.

Darren



At 23:07 26/05/2006, you wrote:
>A tad off the contest topic, your forbearance is craved
>
>Here in south GW we are quite familiar, both on HF and VHF, with reflections
>off the various hills, which imparts a characteristic multi-path effect, not
>unlike that which one hears on W6/7 signals on HF. However, very recently
>something quite different has occurred on 6m, between myself in Glam. (IO81)
>and Geoff/GW3LEW in Pembs ( IO71).
>
>The other day Geoff reported hearing two distinct signals from me, with a
>quite a significant time lag between them, probably in the order of the
>delay with which many of you CW ops will be familiar during ( F2) back
>scatter conditions using QSK. I had not heard this on Geoff, but today ,
>when we were both beaming SE, with strong Es propagation from HA and the
>Balkans, I did. The effect was quite bizarre, just as if there were two
>identical transmissions separated by some milliseconds. In days of yore I
>remember this same effect when running meteor scatter on 2m. In this case it
>was often accompanied by a Doppler shift, which certainly does not occur in
>this scenario.
>
>Sooooh , we wonder what's going on, are we getting Es backscatter perhaps;
>has anyone else experienced similar?
>
>
>Thanks for the bandwidth
>
>73
>
>
>Clive
>GW3NJW
>
>http://www.gw3njw.org
>
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