Re: [RTTY] 10 & 15 meter scatter paths

[Jerry Flanders <jeflanders@comcast.net>]

I don't think the turnaround delay (the changeover from TX to RX) would let 
you hear something only 20 ms later unless you were running a very fast QSK 
rig barefoot. Maybe 50 ms. I have heard the "tink" (and that is  GOOD 
description of the sound) many times. I am pretty sure it is the 140ms 
around the world trip, but have not tried to scope it to actually measure 
the delay.

I have heard it mostly on 10m. My 10m antenna is a 1.25 wavelength vertical 
dipole, so I can hear well from all directions - no F/B discrimination for 
the returning sig.

Jerry W4UK

At 14:56 9/29/04, Bill Turner wrote:
> On Tue, 28 Sep 2004 19:20:20 +0000, Jerry Flanders wrote:
>
> >Anytime you can hear the tail end of your own transmission it is making it
> >completely around the world. Round trip is about 1/7 second.
>
> _________________________________________________________
>
> I'm talking about an echo much shorter than 1/7 th of a second.  I
> would estimate between 1/20 th and 1/50 th of a second.  This echo is
> gone almost before you are aware it's there.  Like I said, it is a
> very quick 'tink' sound.  By comparison, 1/7 th of a second would be
> quite long.
>
> It's interesting to rotate the antenna during a series of CQs and hear
> the echo come and go depending on direction.
>
> --
> Bill W6WRT


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