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Re: LF: Re: LF propagation

To: <[email protected]>
Subject: Re: LF: Re: LF propagation
From: "Graham" <[email protected]>
Date: Mon, 17 Jun 2013 21:04:55 +0100
Importance: Normal
In-reply-to: <[email protected]>
Publishsize: 35969
References: <[email protected]> <[email protected]>
Reply-to: [email protected]
Sender: [email protected]
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The ionospheric effects at these higher frequencies are completely <BR>&gt; different to what happens below 500kHz<BR>&gt; <BR>&gt; There are so called "focussing" effects and effects due to ionospheric <BR>&gt; "tilt".....but there also other effects at LF. It is easy to be led astray <BR>&gt; relying perhaps only on amateur transmissions. I recollect over long periods <BR>&gt; the best times at 136kHz were either just after sunset, or just before dawn <BR>&gt; ....few good periods seemed to happen around dark period at the receive site <BR>&gt; (03:00 local time) Modern beacons and auto logging could definitely add to <BR>&gt; knowledge in this area. However there are also questions......nothing will <BR>&gt; be received if the transmitter has stopped transmitting, but it will look <BR>&gt; like poor propagation.<BR>&gt; <BR>&gt; Alan<BR>&gt; G3NYK<BR>&gt; <BR>&gt; ----- Original Message ----- <BR>&gt; From: "Stefan Schýÿfer" &lt;Stefan.Schaefer@iup.uni-heidelberg.de&gt;<BR>&gt; To: &lt;rsgb_lf_group@blacksheep.org&gt;<BR>&gt; Sent: Monday, June 17, 2013 5:31 PM<BR>&gt; Subject: LF: LF propagation<BR>&gt; <BR>&gt; <BR>&gt;&gt; Hi all,<BR>&gt;&gt;<BR>&gt;&gt; I just want to share this link, <BR>&gt;&gt; http://www.vfo-magazin.de/1999/10/auswirkungen-der-sonnenfinsternis-auf-das-langwellenband/<BR>&gt;&gt;<BR>&gt;&gt; There is a picture which shows nicely why the best S/N of a LF DX signal <BR>&gt;&gt; is achieved just before the sunrise at the TX location, when the RX <BR>&gt;&gt; station is in the west, as we can see daily in TA detections. If German is <BR>&gt;&gt; not your language, just use google translate.<BR>&gt;&gt;<BR>&gt;&gt; 73, Stefan/DK7FC<BR>&gt;&gt; <BR>&gt; <BR>&gt;</DIV></DIV> <DIV style="MARGIN-TOP: 50px" contentEditable=false> <TABLE style="BACKGROUND-COLOR: #f5f5f5; WIDTH: 100%; FONT-FAMILY: Verdana; WHITE-SPACE: nowrap; FONT-SIZE: 11px; RIGHT: 0px; LEFT: 10px" cellSpacing=0 cellPadding=10 align=left> <TBODY> <TR> <TD title="Join Windows Live to share photos using Windows Live Photo E-mail" colSpan=2><A style="COLOR: #444444" href="http://g.msn.com/5meen_us/175">Get Windows Live Mail to create your own photo e-mails </A></TD></TR></TBODY></TABLE></DIV></BODY></HTML>

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