Re: LF: Re: OE5ODL over different paths

["mal hamilton" <g3kevmal@talktalk.net>]

Markus

My report is more important by reporting that I can copy these signals in a wide FFT bandwidth, more suitable information for QSO purposes at reasonable speeds.

You seem to be concentrating on statistical recording data on narrow FFT bandwidths which distorts the true facts.

ie One thinks that narrow FFT bandwidths are a necessity to observe signals on VLF, which is not the case. 

Most information circulating and grabbers seem to favour this narrow FFT bandwith procedure.

My main object is to communicate at an appropriate speed for conditions at the time and not be intimated by statistical nonsense.

I surely have proved the point over this past weekend by receiving both DK7FC and OE5ODL in QRS3 mode and faster.

Until now the trend has been QRS600 or slower as the only way, and mmmmmmmH FFT bandwidths.

I prefer to experiment and operate at the fastest QRS speed possible and CW on LF/VLF to communicate

g3kev

 

   

 

 

----- Original Message -----

From: Markus Vester

To: rsgb_lf_group@blacksheep.org

Sent: Monday, February 07, 2011 7:04 PM

Subject: Re: LF: Re: OE5ODL over different paths

Mal,

 

your report for Ossi is certainly acknowledged, and the fact that your good receive conditions often allow you to see a signal in a relatively wide FFT bandwidth was indeed noted.

 

In the context of my recent posting, it was not my intention to list or qualify reception reports or DX achievements. In order to visualise patterns of fieldstrength variation over of the day, I was looking for continuous multi-hour traces on the available grabbers.

 

And yes, an additional data set for your distance would be valuable indeed. For this, you could either run SpecLab slowly, or perhaps use it's plotter function to create a graph or list of signal level versus time.

 

Best 73,

Markus (DF6NM)

From: mal hamilton

Sent: Monday, February 07, 2011 7:22 PM

To: rsgb_lf_group@blacksheep.org

Subject: LF: Re: OE5ODL over different paths

Markus

You forgot my reception report at  1191 km as confirmed by Stefan.

I was able to copy all day at a speed as fast as QRS3.The signal for most of the day morning and afternoon was fairly steady.

The signal was strong enough for a QSO at QRS 3 or QRS10

Please get the statistics correct, leaving out the 1191 km distance distorts the facts.

g3kev

 

----- Original Message -----

From: Markus Vester

To: rsgb_lf_group@blacksheep.org

Sent: Monday, February 07, 2011 5:49 PM

Subject: VLF: OE5ODL over different paths

Today's long carrier from OE5ODL provides another nice illustration of the diurnal modal interference patterns.

 

The receivers at about 200 km see a minimum before and around local noon

 OE3GHB http://members.aon.at/grabber/VLF/index.html ,

 DF6NM http://www.mydarc.de/df6nm/vlf/vlfgrabber.htm .

 

However at about 400 km, a maximum occurs at the same time

 DK7FC http://www.iup.uni-heidelberg.de/schaefer_vlf/DK7FC_VLF_Grabber.html  ("600" window).

 

Renato's line at about 600 km

 IK1QFK http://www.webalice.it/rromero/pontese/Spectrum3/last-LFtest.jpg

looks somewhat flatter, but apparently receiver gain had been stepped up at 12:45.

 

At nearly 2800 km,

 TF3HZ http://simnet.is/halldorgudmunds/TF3HZ_VLFgrabber/ ("2400" window)

again sees a rather flat inimum from about 10 to 12 UT.

 

Best 73,

Markus (DF6NM)