Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-dk06.r1000.mx.aol.com (Internet Inbound) with ESMTP id 223A538000122; Mon, 8 Aug 2011 12:31:45 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1QqSj9-0001FY-2k for rs_out_1@blacksheep.org; Mon, 08 Aug 2011 17:30:55 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1QqSj8-0001FP-CY for rsgb_lf_group@blacksheep.org; Mon, 08 Aug 2011 17:30:54 +0100 Received: from mail-ew0-f43.google.com ([209.85.215.43]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1QqSj6-0002DC-6h for rsgb_lf_group@blacksheep.org; Mon, 08 Aug 2011 17:30:54 +0100 Received: by ewy20 with SMTP id 20so2468659ewy.16 for ; Mon, 08 Aug 2011 09:30:46 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=message-id:from:to:references:in-reply-to:subject:date:mime-version :content-type:x-priority:x-msmail-priority:importance:x-mailer :x-mimeole; bh=uWcwO0UuU815UDE+hyAH2Kj/SLirdhIp0zsauSdTrpk=; b=LSCRVPPopLkVKoxSWhD+/XRG6GByo4WVV85eU2qy3vQGk1uQmvD2ETUzQzXTAv5Tr5 59ldAHxRpSnTtMniq1cSkYKG3tNHHDVRp6wYlsGqCv4JwB2wyd76NM7mexEZTWJoUEz6 mq+I2Al1BMSIMW5dWepP7Ec1rkj90PwwZPcdw= Received: by 10.213.8.146 with SMTP id h18mr1027242ebh.137.1312821046342; Mon, 08 Aug 2011 09:30:46 -0700 (PDT) Received: from PcMinto (h50208.upc-h.chello.nl [62.194.50.208]) by mx.google.com with ESMTPS id v8sm2563800eej.50.2011.08.08.09.30.37 (version=SSLv3 cipher=OTHER); Mon, 08 Aug 2011 09:30:38 -0700 (PDT) Message-ID: From: Minto Witteveen To: References: <410DFBA20276417D9710672E4EDC59FD@PCvanAlbert> <4E3FC930.1040502@iup.uni-heidelberg.de> In-Reply-To: <4E3FC930.1040502@iup.uni-heidelberg.de> Date: Mon, 8 Aug 2011 18:30:29 +0200 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal Importance: Normal X-Mailer: Microsoft Windows Live Mail 15.4.3538.513 X-MimeOLE: Produced By Microsoft MimeOLE V15.4.3538.513 X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,HTML_MESSAGE=0.001 Subject: LF: Re: CW sked on 137 friday morning? Content-Type: multipart/alternative; boundary="----=_NextPart_000_00CC_01CC55F9.3FF7BDC0" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.9 required=5.0 tests=HTML_30_40,HTML_MESSAGE, MISSING_OUTLOOK_NAME 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-SCOLL-SCORE: 0:2:445158400:93952408 X-AOL-SCOLL-URL_COUNT: 0 X-AOL-SCOLL-AUTHENTICATION: mail_rly_antispam_dkim-m001.1 ; domain : gmail.com DKIM : fail x-aol-sid: 3039ac1db40a4e400f716d87 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none This is a multi-part message in MIME format. ------=_NextPart_000_00CC_01CC55F9.3FF7BDC0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Hi Stefan, Roelof, Albert, Markus. Thanks for the info.=20 So between 50 dB en 90 dB =E2=80=A6 That=E2=80=99s quite a range. I _think_ it is more than 50 dB, but most certainly not in the 80-90 dB = range, alas. Not with the amount of man-made noise I see here on HF, = although on 137 I only hear (white) noise and some QRN. On HF it is S8 = white noise + an enormous amount of other man-made QRM, sometime peaking = to 9+20. I will build a 40 dB attenuator to expand the range I can measure with = the 897 to approximately 80 dB, I think this will be enough=E2=80=A6 Regards, Minto pa3bca. -------------------------------------------------------------------------= - Ceterum censeo Carthaginem delendam esse From: Stefan Sch=C3=A4fer=20 Sent: Monday, August 08, 2011 13:32 To: rsgb_lf_group@blacksheep.org=20 Subject: Re: LF: Re: Re: CW sked on 137 friday morning? Hello Albert, That's quite good. Today it is just 50 dB in 1 Hz here. I have extended my wideband screen = to display DCF39 and HGA22, bottom of = http://www.iup.uni-heidelberg.de/schaefer_vlf/DK7FC_LF_DX_Grabber.html In my RX there is a band pass filter with unknown attenuation at 138.83 = kHz. I estimate it is 15...20 dB. But it changes when the antenna = becomes wet :-/ Somehow i think there is a stable and equal distributed = noise level here in the city that limits the sensitivity. But i've = learned a bit more in the last weeks and will investigate things = further... 73, Stefan/DK7FC Am 08.08.2011 10:27, schrieb Albert:=20 Hi Minto, Roelof, Stefan es others, The difference between DCF39 and the noise floor on a quiet day is 92 = dB in 1 Hz (JO33DE) Antenna "inv L" 18m V and 34m H 73, Albert ------=_NextPart_000_00CC_01CC55F9.3FF7BDC0 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable

Hi Stefan,=20 Roelof, Albert, Markus.

Thanks = for the info.=20
So between 50 dB en 90 dB =E2=80=A6 That=E2=80=99s quite a = range.
I _think_ it is=20 more than 50 dB, but most certainly not in the 80-90 dB range, alas. Not = with=20 the amount of man-made noise I see here on HF, although on 137 I only = hear=20 (white) noise and some QRN. On HF it is S8 white noise + an enormous = amount of=20 other man-made QRM, sometime peaking to 9+20.
I will build a 40 dB = attenuator=20 to expand the range I can measure with the 897 to approximately 80 dB, I = think=20 this will be enough=E2=80=A6

Regards,
Minto = pa3bca.

 
-------------------------------------------------------------------= -------
Ceterum=20 censeo Carthaginem delendam esse
 
From: Stefan Sch=C3=A4fer =
Sent: Monday, August 08, 2011 13:32
Subject: Re: LF: Re: Re: CW sked on 137 friday=20 morning?
 
Hello=20 Albert,

That's quite good.
Today it is just 50 dB in 1 Hz = here. I have=20 extended my wideband screen to display DCF39 and HGA22, bottom of http://www.iup.uni-heidelberg.de/schaefer_vlf/DK7FC_LF_DX_Grabber.= html

In=20 my RX there is a band pass filter with unknown attenuation at 138.83 = kHz. I=20 estimate it is 15...20 dB. But it changes when the antenna becomes wet = :-/=20 Somehow i think there is a stable and equal distributed noise level here = in the=20 city that limits the sensitivity. But i've learned a bit more in the = last weeks=20 and will investigate things further...

73, Stefan/DK7FC

Am = 08.08.2011 10:27, schrieb Albert:=20
Hi Minto, Roelof, Stefan es = others,
 
The difference between DCF39 and the = noise floor=20 on a quiet day is 92 dB in 1 = Hz (JO33DE)=20 Antenna "inv L" 18m V and 34m H
 
73,=20 Albert
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