Message-ID: <512547BF.8070900@iup.uni-heidelberg.de>
Date: Wed, 20 Feb 2013 23:01:35 +0100
From: =?ISO-8859-15?Q?Stefan_Sch=E4fer?= <Stefan.Schaefer@iup.uni-heidelberg.de>
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; de; rv:1.9.1.8) Gecko/20100227 Thunderbird/3.0.3
MIME-Version: 1.0
To: rsgb_lf_group@blacksheep.org
References: <51241A3B.5020105@iup.uni-heidelberg.de> <51241C8C.4030001@iup.uni-heidelberg.de> <001301ce0f67$423300d0$6401a8c0@JAYDELL> <6CCB8568E37648CFB765B787E462B4DA@gnat> <003801ce0f7b$1c63f530$6401a8c0@JAYDELL> <E69CF1B8FEF54D0F91A4F9E14E9569A9@gnat>
In-Reply-To: <E69CF1B8FEF54D0F91A4F9E14E9569A9@gnat>
Subject: Re: LF: Beacon to the west
Content-Type: text/plain; charset=ISO-8859-15; format=flowed
Content-Transfer-Encoding: 7bit
Sender: owner-rsgb_lf_group@blacksheep.org
Precedence: bulk
Reply-To: rsgb_lf_group@blacksheep.org


Jay, Alan, Mark, LF,

Thanks for the discussion and for watching. KU7Z, that sounds like a 
challenge! Not sure if i can make that path in this time of the year. 
But we never know...

Alan, did you get more informations which confirm or deny your theory 
since the Venezuela grabber is available?

73, Stefan


Am 20.02.2013 16:44, schrieb Alan Melia:
> Thanks for that Jay I will factor that into my musings   :-))
> I think that is within the range I have been considering.....so that 
> is very useful data.
> You put the finger on the difficulty of knowing how much the local 
> noise level has shifted, but this is where your long experience is an 
> advantage.
>
> I have a vast amount of data the problem is thinking of a way of 
> displaying it that will stimulate some new ideas.....plenty to fill my 
> waking hours :-))
>
> Alan
> G3NYK
> ----- Original Message ----- From: <jrusgrove@comcast.net>
> To: <rsgb_lf_group@blacksheep.org>
> Sent: Wednesday, February 20, 2013 3:01 PM
> Subject: Re: LF: Beacon to the west
>
>
>> Alan
>>
>> Thanks for your comments.
>>
>> Based on Spectrum Lab's s/n measurement, along with that of WSPR, I 
>> would say that we are in a period where signals are down roughly 6 - 
>> 10 dB on the EU > NA T/A path as compared to a month ago. There have 
>> been a few nights where the noise floor was elevated due to 
>> thunderstorms in the US but I am not including them in my observation.
>>
>> Jay W1VD  WD2XNS  WE2XGR/2
>>
>> p.s. I rarely use Argo any more since it is virtually impossible to 
>> determine s/n of the received signals.
>>
>>
>> ----- Original Message ----- From: "Alan Melia" 
>> <alan.melia@btinternet.com>
>> To: <rsgb_lf_group@blacksheep.org>
>> Sent: Wednesday, February 20, 2013 9:32 AM
>> Subject: Re: LF: Beacon to the west
>>
>>
>>> Hi Jay I am still pondering this, plotting Dst against "period 
>>> receive signal exceeds xdB" gives a interesting but not very 
>>> illumination picture. It provides a cut off when theDstis depressed, 
>>> but it shows a wide range of received signals when the Dst is high 
>>> (towards zero nT). I am still looking for another factor.
>>>
>>> By "quiet period" I mean Kp <2 for 10 days or more.... really quiet 
>>> geomagnetically and signal levels seem to be unexpectedly poor. Then 
>>> signals seem to improve after a low level event say Kp=4 . That led 
>>> to my idea of ionospheric "leak".
>>>
>>> However taking a quick look at the recent conditions, things look 
>>> active enough to be "normal". It is very confusing but I am looking 
>>> to see if it could be explained by just an unfavourable path 
>>> length/fading. Unfortunately one needs several stations in different 
>>> location to either tranmit, or several receiving stations to receive 
>>> the same signal to see the effect of this. If some paths are 
>>> unfavouable other should be favoured.
>>>
>>> One problem also is I do not know what a "subjectively" worse signal 
>>> means, does it mean 10dB ?? Most likely not waterfal displays are 
>>> very non-linear so it might only be a dB or two. That could easily 
>>> be expained by a fading pattern involving say three different hop 
>>> modes.
>>>
>>> There was a grab recently that shoed Stefan and Markus. Markus was 
>>> fading to a "ragged" trace at times whereas Stefan was solid all the 
>>> time, though they were probably seeing similar fading conditions.
>>>
>>> I am still not convinced that there is not some other effect but I 
>>> cant find anything:-))  Bit like "Dark Propagation" :-))
>>>
>>> Best Wishes
>>> Alan
>>> G3NYK
>>>
>>> ----- Original Message ----- From: <jrusgrove@comcast.net>
>>> To: <rsgb_lf_group@blacksheep.org>
>>> Cc: <jrusgrove@comcast.net>; <lowfer@mailman.qth.net>
>>> Sent: Wednesday, February 20, 2013 12:38 PM
>>> Subject: Re: LF: Beacon to the west
>>>
>>>
>>>> Stefan
>>>>
>>>> Good copy last night ... although some dB short of the 'best' 
>>>> conditions. Seem to recall Alan mentioning that prolonged 'quiet' 
>>>> periods can be less favorable than those that feature some 'ups and 
>>>> downs'. Maybe Alan will chime in.
>>>>
>>>> Representative capture below. Copy past 0800Z at 
>>>> http://www.w1vd.com/interestinggrab.html  ... if you squint hard 
>>>> enough.
>>>>
>>>> Jay W1VD  WD2XNS  WE2XGR/2
>>>>
>>>
>>>
>>
>>
>