Message-ID: <06070BD781874171BA8119364F7CFF48@gnat>
From: "Alan Melia" <alan.melia@btinternet.com>
To: <rsgb_lf_group@blacksheep.org>
References: <0MNdxu-1Zl3vu0oLy-007AvH@mail.gmx.com> <5603CC31.2000401@posteo.de> <560508B4.6000303@posteo.de> <258E2E67F0754FC2B833F8C44E2EA246@White> <56080126.2050308@charter.net>
Date: Sun, 27 Sep 2015 17:22:35 +0100
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Subject: Re: LF: First MF TA since a longer time
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Status: O

Thank you John......those details tend to confirm the comment I made to 
Graham. the results from different receivers are dependent on their 
location. This is ratherwhy I suggested that one receiving station 
monitoring two or more senders. It would seem that if the ground conditions 
are that important then variation amongst different stations, then the 
signals might have a portion of the wave arriving via ground 
scatter......effectively a form of grounnd following wave. Otherwise I 
cannot see that the ground coductivity would have such different effects. I 
am assuming that the mail mode "ground bounce" about 2000km down range from 
the receiver is over water in all cases??

There is an argument that Graham made that suggests that even with one 
receiving station there would be similar effects at the transmitting 
end.....more variables demands more data :-))

Are there instances when John 'XKA and Jay receive better signals than Dave 
and John 'TAG ....or are they always worse??

The background to this is my re-analysis of my 9 months of measurements of 
CFH in 2003. They plainly show that good nights occur with a Dst of more 
than -50nT and never occur if the Dst is less than -60nT. However having a 
night with say (the magic :-))  ) -20nT does not guarantee good signals. 
Selecting nights with around -20nT I cannot find any correlation with any 
other parameter, and the spread is quite large......but this is all on one 
fixed path.  Sorry about the obsessive return to this but difficult problems 
are the hardest to leave. :-))

Thanks for all your comments they are all absorbed.

Best Wishes
Alan
G3NYK


----- Original Message ----- 
From: "John Andrews" <w1tag@charter.net>
To: <rsgb_lf_group@blacksheep.org>
Sent: Sunday, September 27, 2015 3:45 PM
Subject: Re: LF: First MF TA since a longer time


> After one quiet night, the MF TA activity increased last night. Dave, AA1A 
> (WD2XSH/17) had 4 spots on DK7FC from 0124 to 0234Z, and 3 spots on DF6NM 
> from 0234 to 0314Z. I (W1TAG/1) had 3 spots on DK7FC from 0204 to 0234Z, 
> and 2 spots on DF6NM from 0254-0314Z. Jay, W1VD (WE2XGR) had no TA spots, 
> but good results to the west.
>
> For Alan's head-scratching, Dave lives right on the Massachusetts coast, 
> about 200 km south of me. His path to EU does not have the overland 
> component that I do in southern (inland) Maine. Jay is 330 km southwest of 
> me, and has a considerable overland path to EU. We all live in an area 
> with very poor ground conductivity. The path to John, WG2XKA in Vermont, 
> who is 200 km west of me, is also more difficult.
>
> Anyway, for the moment the best propagation appears to be in the 
> 0200-0300Z range, so if you have shut down and gone to bed by that point, 
> you may miss out. All of this could change in a day, however!
>
> John, W1TAG/1
>