Return-Path: Received: from mtain-me03.r1000.mx.aol.com (mtain-me03.r1000.mx.aol.com [172.29.96.139]) by air-md02.mail.aol.com (v129.4) with ESMTP id MAILINMD021-8b784c98c46c392; Tue, 21 Sep 2010 10:42:52 -0400 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-me03.r1000.mx.aol.com (Internet Inbound) with ESMTP id 897E9380000E8; Tue, 21 Sep 2010 10:42:51 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1Oy425-0008IP-2r for rs_out_1@blacksheep.org; Tue, 21 Sep 2010 15:41:21 +0100 Received: from [83.244.159.144] (helo=relay3.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1Oy41u-0008I4-HC for rsgb_lf_group@blacksheep.org; Tue, 21 Sep 2010 15:41:10 +0100 Received: from cavuit02.kulnet.kuleuven.be ([134.58.240.44]) by relay3.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1Oy41r-0001wL-Id for rsgb_lf_group@blacksheep.org; Tue, 21 Sep 2010 15:41:11 +0100 Received: from smtps01.kuleuven.be (smtpshost01.kulnet.kuleuven.be [134.58.240.74]) by cavuit02.kulnet.kuleuven.be (Postfix) with ESMTP id 448EB51C007 for ; Tue, 21 Sep 2010 16:40:28 +0200 (CEST) Received: from ICTS-S-HUB-N2.luna.kuleuven.be (icts-s-hub-n2.luna.kuleuven.be [10.112.9.12]) by smtps01.kuleuven.be (Postfix) with ESMTP id 353F031E709 for ; Tue, 21 Sep 2010 16:40:28 +0200 (CEST) Received: from ICTS-S-EXC2-CA.luna.kuleuven.be ([10.112.11.13]) by ICTS-S-HUB-N2.luna.kuleuven.be ([10.112.9.12]) with mapi; Tue, 21 Sep 2010 16:40:28 +0200 X-Kuleuven: This mail passed the K.U.Leuven mailcluster From: Rik Strobbe To: "rsgb_lf_group@blacksheep.org" Date: Tue, 21 Sep 2010 16:40:27 +0200 Thread-Topic: LF: its back - maybe - Thread-Index: ActZl+i1rMVuFDGqQPi2M2put31WjgAAZxcz Message-ID: References: <285121.90276.qm@web86704.mail.ird.yahoo.com> ,<421083.64004.qm@web86703.mail.ird.yahoo.com> In-Reply-To: <421083.64004.qm@web86703.mail.ird.yahoo.com> Accept-Language: nl-NL, nl-BE Content-Language: nl-BE X-MS-Has-Attach: X-MS-TNEF-Correlator: acceptlanguage: nl-NL, nl-BE MIME-Version: 1.0 X-KULeuven-Information: Katholieke Universiteit Leuven X-KULeuven-Scanned: Found to be clean X-KULeuven-Envelope-From: rik.strobbe@fys.kuleuven.be X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,HTML_MESSAGE=0.001 Subject: RE: LF: its back - maybe - Content-Type: multipart/alternative; boundary="_000_BF4A524700075746A6467658DFC7102C63821D3D60ICTSSEXC2CAlu_" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.8 required=5.0 tests=HTML_30_40,HTML_MESSAGE, TO_ADDRESS_EQ_REAL 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 x-aol-global-disposition: G x-aol-sid: 3039ac1d608b4c98c46b4af0 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none X-Mailer: Unknown (No Version) --_000_BF4A524700075746A6467658DFC7102C63821D3D60ICTSSEXC2CAlu_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Dave, Andy, from my own experience I have the impression that false decodes often occu= r in the absense of real decodes. Last week I had WSPR runnig several nights on 137kHz (attempting to catch= G3XBM) on my 500kHz antenna. Connecting the antenna just make the noisefl= oor (as given by the WSPR software) rising by some 5-10dB, so the antenna= performs rather poor on 137kHz. I got no real decodes, but serveral false= ones. Often the deccoding proccess took over 1 minute (on 500kHz with rea= l bandnoise and signal it normally takes 5-10 seconds). Also interesting is the rather frequent appearance of "twins": one false= call shows up during the same decode session on 2 different frequencies. 73, Rik ON7YD - OR7T ________________________________ Van: owner-rsgb_lf_group@blacksheep.org [owner-rsgb_lf_group@blacksheep.or= g] namens Dave Pick [davepick@btinternet.com] Verzonden: dinsdag 21 september 2010 16:14 Aan: rsgb_lf_group@blacksheep.org Onderwerp: Re: LF: its back - maybe - Andy Yes, some very interesting callsigns coming up! Super DX... some of them= appear to be in the middle of the Pacific ocean! What causes that? Dave. ________________________________ From: Andy Talbot To: rsgb_lf_group@blacksheep.org Sent: Tuesday, 21 September, 2010 14:45:07 Subject: Re: LF: its back - maybe - Several decodes of the QRP transmission at G3YXM, all at the -25 to -27dB= S/N level, so right on the threshold. Dave, you're getting quite a number of false decodes accordng to the WSPR= database. Inpulsive QRM perhaps ? Andy www.g4jnt.com On 21 September 2010 11:47, Dave Pick > wrote: Andy I've put my WSPR back on on 137.5 but as I was setting it up I heard a "G8= IMR" CW ID so I'll be surprised if I don't get a copy! Dave By the way, I had a similar shed conflagration a few years back, it was be= tter than yours - the fire brigade attended! ________________________________ From: Andy Talbot > To: rsgb_lf_group@blacksheep.org Sent: Tuesday, 21 September, 2010 11:10:10 Subject: LF: its back - maybe - Hope I'm not typing this too soon, but monitor 137.53kHz (USB dial 136kHz)= WSPR. 600 Watts again A bucket of water is lying close by this time. The coil is now in a brand new plastic dustbin with the variometer control= brought to the outside world on a plastic spindle. Nary a bit of aluminium tape in sight Andy www.g4jnt.com ps. the WSPR message is still untrue. Its nearer 17dBm ERp than the 13dB= m is says. --_000_BF4A524700075746A6467658DFC7102C63821D3D60ICTSSEXC2CAlu_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Dave, Andy,
 
from my own experience I have the im= pression that false decodes often occur in the absense of real decodes.
Last week I had WSPR runnig several= nights on 137kHz (attempting to catch G3XBM) on my 500kHz antenna. Connec= ting the antenna just make the noisefloor (as given by the WSPR software)= rising by some 5-10dB, so the antenna performs rather poor on 137kHz. I got no real decodes, but serveral= false ones. Often the deccoding proccess took over 1 minute&nbs= p;(on 500kHz with real bandnoise and signal it normally takes 5-10 se= conds).
Also interesting is the rather frequ= ent appearance of "twins": one false call shows up during the sa= me decode session on 2 different frequencies.
 
73, Rik  ON7YD - OR7T&nb= sp;
 
Van: owner-rsgb_= lf_group@blacksheep.org [owner-rsgb_lf_group@blacksheep.org] namens Dave= Pick [davepick@btinternet.com]
Verzonden: dinsdag 21 september 2010 16:14
Aan: rsgb_lf_group@blacksheep.org
Onderwerp: Re: LF: its back - maybe -

Andy

Yes, some very interesting callsigns coming up! Super DX... some of them= appear to be in the middle of the Pacific ocean!
What causes that?

Dave.

From: Andy Talbot <andy= .g4jnt@googlemail.com>
To: rsgb_lf_group@blackshe= ep.org
Sent: Tuesday, 21 Septembe= r, 2010 14:45:07
Subject: Re: LF: its back= - maybe -

Several decodes of the QRP transmission at G3YXM, all at the -25 to= -27dB S/N level, so right on the threshold.
 
Dave, you're getting quite a number of false decodes accordng to the= WSPR database.  Inpulsive QRM perhaps ?
 
Andy
 



 
On 21 September 2010 11:47, Dave Pick <d= avepick@btinternet.com> wrote:
Andy

I've put my WSPR back on on 137.5 but as I was setting it up I heard a &qu= ot;G8IMR" CW ID so I'll be surprised if I don't get a copy!

Dave

By the way, I had a similar shed conflagration a few years back, it was be= tter than yours - the fire brigade attended!

From: Andy Talbot <andy.g4jnt@goo= glemail.com>
To: rsgb_lf_group@blacksheep.org
Sent: Tuesday, 21 Septembe= r, 2010 11:10:10
Subject: LF: its back - ma= ybe -

Hope I'm not typing this too soon, but monitor 137.53kHz (USB dial 13= 6kHz) WSPR.
600 Watts again
 
A bucket of water is lying close by this time.  =
The coil is now in a brand new plastic dustbin with the variometer co= ntrol brought to the outside world on a plastic spindle.
 
Nary a bit of aluminium tape in sight
ps.  the WSPR message is still untrue.  Its nearer 17dBm ER= p than the 13dBm is says.
 

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