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LF: Re: Re: Daytime 29.499 kHz

To: <[email protected]>
Subject: LF: Re: Re: Daytime 29.499 kHz
From: <[email protected]>
Date: Sat, 8 Mar 2014 08:51:52 -0500
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Alan
 
Thanks for weighing in.
 
FWIW, the best receptions of SAQ 17.2 kHz at this location (up until the most recent 12/24/13) have occured during their 'late' vs. 'early' session which puts the receiving end well into daylight ... and summer reception has been generally better than winter. 
 
The most recent reception on 12/24/13 was noticeably out of the ordinary as the best ever s/n was noted. A short unprocessed mp3 is at:
 
 
Looking through the archives it appears there were several M class flares on the days leading up to the transmission. This latest reception might make a good 'case study' for someone with the right capabilities. 
 
Jay W1VD  WD2XNS  WE2XGR/2  WG2XRS/2   
 
  
----- Original Message -----
From: Alan Melia
Sent: Friday, March 07, 2014 6:54 PM
Subject: LF: Re: Daytime 29.499 kHz

Hi Markus this dome shape, peaking at mid-day at mid-path, is very clear on all LF and VLF plots, and yes it does get better in summer!! Also I have found that daytime mid-day levels are enhanced for a day and sometimes two days after a geomagnetic storm, due I think to the extra electron density in the D-layer from precipitated "hot" electrons.....being hot they take longer to decay than photo-dissociated electrons even at 50km altitude. The daytime enhancement can be as much as 6dB after a Geomag storm, useful but not as much as to give similar levels as night-time. The "waveguide" is also narrower in daytime, so the signal contact the lossy region more often. We have predicted these on 136 and the effect on short paths was confirmed by John W1TAG and Jay W1VD. This confirms that "ionosheric-wave" is present in daytime, and at distance it is not all ground-wave.
 
Alan
G3NYK
 
----- Original Message -----
Sent: Friday, March 07, 2014 10:33 PM
Subject: LF: Daytime 29.499 kHz

Guess this thread needs a new title...
 
Paul's LWPC interface is here: http://abelian.org/lwpc/
 
It seems that the broad midday maximum appears consistently on different medium-range VLF paths, also on most 100 kHz Loran-C traces. Simplistic interpretation: With higher solar elevation, ionisation penetrates to lower layers and produces a steeper conductivity gradient, quite in analogy to a metal mirror. However this would predict that midday reflection would be stronger in summer?
 
Looking forward to Bob's test tomorrow!
 
Best 73,
Markus (DF6NM)

From: hvanesce
Sent: Friday, March 07, 2014 11:16 PM
Subject: RE: LF: New OPERA OP/OPDS 2H tonight on 27.945 Dial Freq...

Markus,

 

I?m glad that you suggested a 2-hour time slot (if it works for Bob). Based on your NAA spectrogram (attached), the window that you?re shooting for may be a multimode interference peak, which might be shifted (an hour or so?) for a Penn Yan path; and I don?t know which direction in time the window would shift.

 

Paul is doing so many things that I hate to mention this, but I wonder if LWPC would show the interference peak near 1500 UT; and if so, which direction in time the peak would shift for the Penn Yan path.

 

I seem to remember that Paul provided an online interface to LWPC, I?ll see if I can find it.

 

73,  Jim AA5BW   

 

From: [email protected] [mailto:[email protected]] On Behalf Of Markus Vester
Sent: Friday, March 7, 2014 2:45 PM
To: [email protected]
Subject: Re: LF: New OPERA OP/OPDS 2H tonight on 27.945 Dial Freq...

 

Bob,

 

how about a straight carrier on 29.499, from 14 to 16 UT? The narrow grabbers will be on even if I have to be away. Results may depend on the qrn situation here (aka Eu weather).

 

73, Markus

 

From: Bob Raide

Sent: Friday, March 07, 2014 10:29 PM

Subject: RE: LF: New OPERA OP/OPDS 2H tonight on 27.945 Dial Freq...

 


 Markus;
With you home [not at work] tomorrow lets try around that 1500.  I left the signal on two nights ago till 1200 but after 0800 signal was gone till 2400 next night. 
What mode and what time you want signal?  Bob


From: [email protected]
To: [email protected]
Date: Fri, 7 Mar 2014 21:45:19 +0100
Subject: Re: LF: New OPERA OP/OPDS 2H tonight on 27.945 Dial Freq...

Jim,

 

I would think that the main difference between Todmorden and Nuernberg is that I'm into the sunrise dip an hour earlier. And my noise background is higher, so I tend to completely lose a weak signal which Paul would still receive well.

 

Anyway looking at the attached NAA plot I'm sort of perplexed by the strong propagation during the day. If Bob decided to transmit sometime around 15 UT, there's a good chance we'd pick it up.

 

Best 73,

Markus (DF6NM)

 

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