Re: LF: Re: Ducted TA propagation?

[Markus Vester <markusvester@aol.com>]

Thanks Alan for this comment!

 

Yes I wasn't all that serious when referring to it as a duct, I was just amazed by the degree of spatial selective fading at that instant. As Dex and Bill have mentioned, it evened out later during the night, so it was probably really just a random quirk from the gods of propagation.

Thanks very much for the reports, and the very useful grabber operations!

 

Best regards,

MArkus

 

-----Ursprüngliche Mitteilung-----
Von: Alan Melia <alan.melia@btinternet.com>
An: rsgb_lf_group <rsgb_lf_group@blacksheep.org>
Verschickt: Mo, 17 Okt 2011 12:59 pm
Betreff: LF: Re: Ducted TA propagation?

Hi Markus I think you are referring to the type of effect that often happens
on 160m. I dont know the answer but I suggest that it might be difficult to
get 136kHz into a duct and get it out again. Localised variations in signal
particularly with the high sensitivity of grabbers is more easily explained
as due to multipath differences between the sites. You can often see the
second site comming in as the first fades out. This may be more prevalent
with you as you may require an extra "hop" to US in the UK on the TA path.
This makes the signal more dependent on any excess attenuation due to
geomagnetic effects as well.

I will seek some advice as to whether it is a feasible mechanism.

Alan G3NYK

----- Original Message ----- 
From: "Markus Vester" <markusvester@aol.com>
To: <rsgb_lf_group@blacksheep.org>
Sent: Monday, October 17, 2011 1:00 AM
Subject: LF: Ducted TA propagation?


Now just before midnight UT, Ossi's "555" on 136173.1 is clearly visible on
VE2IQ's grabber, and my "NM" on 136172.5 seems to make it through to W4DEX.
However not a trace vice versa...

Best 73,
Markus (DF6NM)