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Message-ID: <005f01cc8ccd$0aa34bc0$4001a8c0@lark>
From: "Alan Melia" <alan.melia@btinternet.com>
To: <rsgb_lf_group@blacksheep.org>
References: <CC2FD0DBE12E44C2AEB05695C3452576@White> <003f01cc8cbb$cda7c900$4001a8c0@lark> <8CE5AE099A73E46-10E8-5524B@webmail-d083.sysops.aol.com>
Date: Mon, 17 Oct 2011 14:02:33 +0100
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Subject: Re: LF: Re: Ducted TA propagation?
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Hi Markus , well we dont know all the answers even if it might seem like it
sometimes
:-))

Comments like yours trigger new ideas and a  need often to revisit previous
ideas and see whether they are still valid in the era of new information. I
had not thought of the possibility of the "Top Band Trough" but it is well
worth looking into......you know my motto "dont confuse me with theories,
bring on the data " :-))

It has also caused me to contact a couple of old friends in the States for
their opinions.....so a good opportunity to renew old frienships as well.

Best Wishes
Alan G3NYK

----- Original Message ----- 
From: "Markus Vester" <markusvester@aol.com>
To: <rsgb_lf_group@blacksheep.org>
Sent: Monday, October 17, 2011 1:37 PM
Subject: Re: LF: Re: Ducted TA propagation?



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
n 160m. I dont know the answer but I suggest that it might be difficult to
et 136kHz into a duct and get it out again. Localised variations in signal
articularly with the high sensitivity of grabbers is more easily explained
s due to multipath differences between the sites. You can often see the
econd site comming in as the first fades out. This may be more prevalent
ith you as you may require an extra "hop" to US in the UK on the TA path.
his makes the signal more dependent on any excess attenuation due to
eomagnetic effects as well.
I will seek some advice as to whether it is a feasible mechanism.
Alan G3NYK
----- Original Message ----- 
rom: "Markus Vester" <markusvester@aol.com>
o: <rsgb_lf_group@blacksheep.org>
ent: Monday, October 17, 2011 1:00 AM
ubject: LF: Ducted TA propagation?

ow just before midnight UT, Ossi's "555" on 136173.1 is clearly visible on
E2IQ's grabber, and my "NM" on 136172.5 seems to make it through to W4DEX.
owever not a trace vice versa...
Best 73,
arkus (DF6NM)