RE: LF: RE: Hartmut's Grabber On Last Night...

[Bob Raide <rjraide@hotmail.com>]

This sort of thing should be discussed with Markus.
Interestingly, Markus's grabber showed next to nothing for capture.  Henny in the pasted has had a superior signal while last night was rather lackluster.  Hartmut is the farthest of all decoders [approx.-6350 KM] from me-his capture was the best for both Dex and me.
Only thing I could add is that later in the morning the  propagation lengthens out showing the further away sigs from Dex best later on.
Bob
 

---

From: hvanesce@comcast.net
To: rsgb_lf_group@blacksheep.org
Date: Sun, 3 Nov 2013 14:56:02 -0600
Subject: LF: RE: Hartmut's Grabber On Last Night...

Bob,

 

This is the third time that I’ve noticed Dex’s signal peaking substantially (>15dB?) starting around 0500, at approximately the same time that your signal begins a substantial fade. I’ve seen this twice on captures from Hartmut’s grabber, and once on a capture from Mike’s grabber.

 

An interesting example is 21 October 2013, when captures by Henny, Mike and Hartmut all showed a fade of roughly 10-15dB in your signal from 0500-0530, with Mike’s grabber (which showed Dex’s signal clearly around that time) showing a rise in Dex’s signal of roughly 10-15dB.  

 

I wonder if this could be attributable to modal phase reinforcement/cancellation near the terminator? The relative change between your signal and Dex’s seems rather high for that mechanism, but I suppose not out of the question. AGARD CP 305 includes a paper (Morfitt) with some interesting plots in this context, and a number of other papers with interesting propagation studies at frequencies near 74kHz; is there a good place for me to post info of this type?

 

73,

 

Jim AA5BW

 

From: owner-rsgb_lf_group@blacksheep.org [mailto:owner-rsgb_lf_group@blacksheep.org] On Behalf Of Bob Raide
Sent: Sunday, November 3, 2013 12:07 PM
To: rsgb_lf_group@blacksheep.org
Subject: LF: Hartmut's Grabber On Last Night...

 

Good shots of Me and Dex-Bob WG2XRS/4 NY [XRS4] and [XRS5]...