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[129.206.22.206]) by mx.google.com with ESMTPSA id b1sm7617890eef.15.2014.05.20.17.35.32 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Tue, 20 May 2014 17:35:33 -0700 (PDT) X-Google-Original-From: DK7FC <73dk7fc@gmail.com> Message-ID: <537BF4D3.6050903@gmail.com> Date: Wed, 21 May 2014 02:35:31 +0200 From: DK7FC <73dk7fc@googlemail.com> User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; de; rv:1.9.1.8) Gecko/20100227 Thunderbird/3.0.3 MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org References: <537B3F53.1000301@gmail.com> In-Reply-To: X-Spam-Score: -0.7 (/) X-Spam-Report: Spam detection software, running on the system "relay1.thorcom.net", has identified this incoming email as possible spam. The original message has been attached to this so you can view it (if it isn't spam) or label similar future email. If you have any questions, see the administrator of that system for details. Content preview: Hi Alan, My observation is that the sky wave attenuation at daytime in summer is in the order of 40 dB over that distance. So i think it is groundwave exclusively. Also i can't see QSB over that distances at daytime (maybe 1 dB). [...] Content analysis details: (-0.7 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.7 RCVD_IN_DNSWL_LOW RBL: Sender listed at http://www.dnswl.org/, low trust [74.125.83.51 listed in list.dnswl.org] 0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider (73dk7fc[at]googlemail.com) -0.0 SPF_PASS SPF: sender matches SPF record 0.0 HTML_MESSAGE BODY: HTML included in message 0.0 T_DKIM_INVALID DKIM-Signature header exists but is not valid X-Scan-Signature: 3547ef0bd9aa4f6a2596c8a6b1b20265 Subject: Re: LF: Re: MF propagation Content-Type: multipart/alternative; boundary="------------000605080105050105020207" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.6 required=5.0 tests=FROM_HAS_MIXED_NUMS,HTML_50_60, HTML_MESSAGE,HTML_TAG_EXISTS_TBODY autolearn=no version=2.63 X-SA-Exim-Scanned: Yes Sender: owner-rsgb_lf_group@blacksheep.org Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group X-SA-Exim-Rcpt-To: rs_out_1@blacksheep.org X-SA-Exim-Scanned: No; SAEximRunCond expanded to false This is a multi-part message in MIME format. --------------000605080105050105020207 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Hi Alan, My observation is that the sky wave attenuation at daytime in summer is in the order of 40 dB over that distance. So i think it is groundwave exclusively. Also i can't see QSB over that distances at daytime (maybe 1 dB). Water nearly seems to act as an amplifier at 630m :-) Could that be a reason for the choice of the ex marine frequency? ;-) 73, Stefan Am 20.05.2014 21:02, schrieb Alan Melia: > Hi Stefan interesting...... at that distance could it just be > different goundwave v skywave phase at the different receivers. You > really need more thn two paths to pin that one :-)) > Alan > > ----- Original Message ----- > *From:* DK7FC > *To:* rsgb_lf_group@blacksheep.org > > *Sent:* Tuesday, May 20, 2014 12:41 PM > *Subject:* LF: MF propagation > > Hi MF, > > Timestamp Call MHz SNR Drift Grid Pwr Reporter RGrid km az > 2014-05-20 10:10 PA0A 0.475698 +4 0 JO33de 1 > G3XDV IO91vt 466 253 > 2014-05-20 10:10 PA0A 0.475702 -25 0 JO33de 1 > DK7FC JN49ik 449 157 > > > > That shows the difference of MF propagation over sea water and > over land at daytime! (maybe 3 to 6 dB more background noise here?). > > 73, Stefan > --------------000605080105050105020207 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Hi Alan,

My observation is that the sky wave attenuation at daytime in summer is in the order of 40 dB over that distance. So i think it is groundwave exclusively. Also i can't see QSB over that distances at daytime (maybe 1 dB).

Water nearly seems to act as an amplifier at 630m :-) Could that be a reason for the choice of the ex marine frequency? ;-)

73, Stefan

Am 20.05.2014 21:02, schrieb Alan Melia:
Hi Stefan interesting...... at that distance could it just be different goundwave v skywave phase at the different receivers. You really need more thn two paths to pin that one :-))
 
Alan
----- Original Message -----
From: DK7FC
Sent: Tuesday, May 20, 2014 12:41 PM
Subject: LF: MF propagation

Hi MF,

Timestamp Call MHz SNR Drift Grid Pwr Reporter RGrid km az
 2014-05-20 10:10   PA0A   0.475698   +4   0   JO33de   1   G3XDV   IO91vt   466   253 
 2014-05-20 10:10   PA0A   0.475702   -25   0   JO33de   1   DK7FC   JN49ik   449   157 


That shows the difference of MF propagation over sea water and over land at daytime! (maybe 3 to 6 dB more background noise here?).

73, Stefan
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