Return-Path: Received: (qmail 28012 invoked from network); 12 Apr 2002 12:25:57 -0000 Received: from unknown (HELO warrior.services.quay.plus.net) (212.159.14.227) by exhibition.plus.net with SMTP; 12 Apr 2002 12:25:57 -0000 X-Priority: 3 X-MSMail-Priority: Normal Received: (qmail 23636 invoked from network); 12 Apr 2002 12:25:51 -0000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by warrior.services.quay.plus.net with SMTP; 12 Apr 2002 12:25:51 -0000 Received: from majordom by post.thorcom.com with local (Exim 3.33 #2) id 16w1TJ-0000iB-00 for rsgb_lf_group-outgoing@blacksheep.org; Fri, 12 Apr 2002 14:52:13 +0100 Received: from imo-m08.mx.aol.com ([64.12.136.163]) by post.thorcom.com with esmtp (Exim 3.33 #2) id 16w1TI-0000i6-00 for rsgb_lf_group@blacksheep.org; Fri, 12 Apr 2002 14:52:12 +0100 Received: from DL4YHF@aol.com by imo-m08.mx.aol.com (mail_out_v32.5.) id l.e6.2659758f (30974) for ; Fri, 12 Apr 2002 08:13:30 -0400 (EDT) From: DL4YHF@aol.com Message-ID: Date: Fri, 12 Apr 2002 08:13:29 EDT Subject: Re: LF: Phase meter for propagation experiment To: rsgb_lf_group@blacksheep.org MIME-Version: 1.0 Content-Type: text/html; charset=windows-1252 X-Mailer: AOL 6.0 for Windows XP DE sub 50 Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group Sender: Content-transfer-encoding: 8bit Hello Jim, Uwe and group,

Yes of course an LF broadcaster can only be used as reference if he is quite close to your station. Groundwave propagation must be dominant throughout the observation period. But there is a way to find this out:
Use the TV sync as reference to observe the MSF or DCF77 carrier. Requires no hardware (except for a potentiometers to adjust the input signals to the receiver).  Input signals (into the longwave receiver) will be 4*15625 Hz and 60kHz, or 5*15625 Hz and 77.5 kHz. Fortunately, in both cases the signals fit in a standard 3kHz IF bandwidth.

This allows checking if the reference phase is stable enough  -  if you are lucky you'll never have to let the TV turned on overnight ;-). I will try this experiment soon and let you know the results.

Thanks Uwe for the signal gallery. From your QTH, you can be sure to receive Loran from Sylt via groundwave !

Regards,
 Wolf  DL4YHF.