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Re: LF: Re: Bunch of detects!

To: <[email protected]>
Subject: Re: LF: Re: Bunch of detects!
From: "Markus Vester" <[email protected]>
Date: Sat, 29 Mar 2014 23:20:26 +0100
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Bob, well I guess I'm sort if lucky on 29.5 as there happens to be little QRM here from big utility stations, railway, etc. Even local QRM has been scarce (though I hardly dare write that, as one of our twenty-odd neighbour families may any time corrupt the frequency by a nasty SMPS / battery charger / energy saving lamp / modem / you name it). Extrapolating received Opds-2H levels to QRSS would result in needing something like 10 minute dots, so not really encouraging.
 
Regarding 8.3 kHz: I guess everyone working there is limited by antenna voltage / corona, and as you say usually not much power is needed to get to that limit. Assuming same voltage capability (eg 30 kV), going down from 29.5 to 8.3 you'll need to reduce current by a factor of 3.5, decreasing ERP by 22 dB. On the other hand, Paul Nicholson was able to resolve your 2-minute dots on 29.5, thus in a quiet night, an 8 hour continuous carrier on 8270 might just become detectable in Todmorden. In addition, Paul's http://abelian.org/vlf/ lists several online VLF receivers sending high quality audio streams, and I reckon a reception eg by Mike Smith in Forest / Virginia would be quite likely and good DX for starters.  
 
73,
Markus (DF6NM)
 

From: Bob Raide
Sent: Saturday, March 29, 2014 8:26 PM
Subject: RE: LF: Re: Bunch of detects!

Markus;
29 is about it for me.  I like to see some of the other modes get detected but so far just not enough signal for any real QRSS from like Henny, and Hartmut.  Your OPDS sure works but many still have work to do to get detections at -52 or so.  What QRSS speed would I need for you to get a decent capture on 29 QRSS??? OP2HDS is going to be hard to beat.
The OPERA DS detects have been very impressive from your QTH and you are in amongst other houses!  Others have for the time being stopped work on VLF reception.  Hope next season there will be improvements in that area.
If I could run enough power on 9 kHz I would try it but I see very nasty voltages being generated with this short ant.
I'll go back to 29 tomorrow night with OP2H and hope for another detection from you and maybe someone else T/A.  Your the furthest European other than the Russians so should see others with detections sooner or later I would think-Bob  
 

From: [email protected]
To: [email protected]
Date: Sat, 29 Mar 2014 20:04:44 +0100
Subject: LF: Re: Bunch of detects!

Bob,
 
thanks for the signal, nice to find all those good detections!
 
Tomorrow? Swing low! For me, the lower and slower, the better. And give the Opera guys a chance for a TA decode on 29.5 kHz ;-)
 
Actually, why not go sub 8.3 kHz one night, and provide a fair challenge to Paul Nicholson. All you'll need to do is wind up a couple of kilometers of thin magnet wire (say AWG26) on a plastic bucket ;-)
 
Have a good weekend,
 
73, Markus
 

From: Bob Raide
Sent: Saturday, March 29, 2014 4:48 PM
Subject: Bunch of detects!

Markus;
Was easy to find clear spot with your grabber.  Condx seemed good and made a bunch of detects I see!
Will do again tonight same freq.
If you want-maybe tomorrow try 74  or back to VLF 29kHz if you want-Bob
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