Return-Path: X-Spam-DCC: paranoid 1233; Body=3 Fuz1=3 Fuz2=3 X-Spam-Checker-Version: SpamAssassin 3.1.3 (2006-06-01) on lipkowski.org X-Spam-Level: X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00,DNS_FROM_AHBL_RHSBL, HTML_40_50,HTML_MESSAGE autolearn=no version=3.1.3 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by paranoid.lipkowski.org (8.13.7/8.13.7) with ESMTP id t2DKYpEs002294 for ; Fri, 13 Mar 2015 21:34:51 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1YWWFg-0001nd-AL for rs_out_1@blacksheep.org; Fri, 13 Mar 2015 20:32:12 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1YWWFf-0001nU-Tc for rsgb_lf_group@blacksheep.org; Fri, 13 Mar 2015 20:32:11 +0000 Received: from omr-m4.mx.aol.com ([64.12.226.25]) by relay1.thorcom.net with esmtps (TLSv1:DHE-RSA-AES256-SHA:256) (Exim 4.85) (envelope-from ) id 1YWWFd-0000tr-Ct for rsgb_lf_group@blacksheep.org; Fri, 13 Mar 2015 20:32:10 +0000 Received: from mtaout-mcb02.mx.aol.com (mtaout-mcb02.mx.aol.com [172.26.50.174]) by omr-m4.mx.aol.com (Outbound Mail Relay) with ESMTP id 9D6D838000041 for ; Fri, 13 Mar 2015 16:32:06 -0400 (EDT) Received: from White (ipb21bee4a.dynamic.kabel-deutschland.de [178.27.238.74]) by mtaout-mcb02.mx.aol.com (MUA/Third Party Client Interface) with ESMTPA id BB0693800009E for ; Fri, 13 Mar 2015 16:32:03 -0400 (EDT) Message-ID: <431CD2E1E8224D93B9A5FCBEE693A6AB@White> From: "Markus Vester" To: References: <550344F5.1040409@lineone.net> Date: Fri, 13 Mar 2015 21:31:54 +0100 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal Importance: Normal X-Mailer: Microsoft Windows Live Mail 12.0.1606 X-MimeOLE: Produced By Microsoft MimeOLE V12.0.1606 x-aol-global-disposition: G DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=mx.aol.com; s=20140625; t=1426278726; bh=zcJ8U8nTFI5T+UwHTFsyDyDuXVJ9v/n7Rf94x61eR3w=; h=From:To:Subject:Message-ID:Date:MIME-Version:Content-Type; b=oxS5k0A0l6C/jeO5FmqGCV9BABBOTcojdSc14K9iS1YfHf/VskAB9na5opJF066lU ngchr3NB0XKhZwCY+OLhwh1kQCvvzuMm8xB/wxF3yjW49VLZ3z46kf8B6WzUlDMBYz 8ONaUkC1bjcELdMfsogaH93bDx3u85hpGnYpIrH4= x-aol-sid: 3039ac1a32ae550349436658 X-AOL-IP: 178.27.238.74 X-Scan-Signature: f45514038df04b1035abb1d5446da941 Subject: Re: LF: No Opera decoding on 136kHz Content-Type: multipart/alternative; boundary="----=_NextPart_000_0003_01D05DD5.202CAB80" 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-Scanned-By: MIMEDefang 2.56 on 10.1.3.10 Status: O X-Status: X-Keywords: X-UID: 2643 Dies ist eine mehrteilige Nachricht im MIME-Format. ------=_NextPart_000_0003_01D05DD5.202CAB80 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Hi Hugh, maybe there was no one transmitting... During the last couple of days, = both PSKreporter and opds-32 have been almost bare of LF Opera spots, = with the exception of a single RN3AGC sequence at 18:46 today. Technically it could also be an exceptionally large deviation of the = soundcard samplerate (more than about 0.4%). But it seems unlikely as = you've been successful on other bands, and also tried different = machines. Best 73, Markus (DF6NM) =20 From: LineOne=20 Sent: Friday, March 13, 2015 9:13 PM To: rsgb_lf_group@blacksheep.org=20 Subject: LF: No Opera decoding on 136kHz I haven't yet successfully decoded anything with Opera on 136khz in=20 spite of seeing some very big, clear signals on the waterfall display.=20 HF results are very satisfactory, especially on 30m. This problem=20 applies using any PC or laptop on the premises. The Rx is the Kenwood R5000 which produces some images below Long Wave=20 but sensitivity is quite good. I use a 136kHz bandpass filter with a=20 -60dB notch at 200kHz and better than -40dB for all frequencies above=20 that. The Rx filter is normally set to 2.1kHz USB and there is a useful=20 notch filter. There is a choice of antenna and preamps. One antenna is effectively a=20 sloper, 10M of open-wire feeder at 45 degrees connected to a horizontal=20 delta loop of about 140M total length. This can be used with the Tx=20 loading coil to tune, or a tuned preamp with about 20dB boost at 136khz. The other is a 1m square of 10mm copper tube, broadly tuned into an=20 in-built +10dB preamp which will take about 200mVp-pk input before=20 clipping. The earth/ground system is extensive. Naturally an alternative receiver would be good but I have nothing=20 available, the FT817 and FT897 seem quite deaf at LF. Any suggestions=20 would be welcome, Hugh, M0DSZ. PS: I will probably be on 136khz this weekend with about 200W dc into a=20 linear amplifier but will note listening activity in case it's all=20 elsewhere. ------=_NextPart_000_0003_01D05DD5.202CAB80 Content-Type: text/html; charset="utf-8" Content-Transfer-Encoding: quoted-printable
Hi Hugh,
 
maybe there was no = one=20 transmitting... During the last couple of days, both PSKreporter and = opds-32=20 have been almost bare of LF Opera spots, with the exception of a = single=20 RN3AGC sequence at 18:46 today.
 
Technically it could = also be an=20 exceptionally large deviation of the soundcard samplerate (more = than about=20 0.4%). But it seems unlikely as you've been successful on other bands, = and also=20 tried different machines.
 
Best = 73,
Markus = (DF6NM)
  

From: LineOne
Sent: Friday, March 13, 2015 9:13 PM
To: rsgb_lf_group@blacksheep.org= =20
Subject: LF: No Opera decoding on 136kHz

I=20 haven't yet successfully decoded anything with Opera on 136khz in =
spite of=20 seeing some very big, clear signals on the waterfall display.
HF = results are=20 very satisfactory, especially on 30m. This problem
applies using any = PC or=20 laptop on the premises.

The Rx is the Kenwood R5000 which = produces some=20 images below Long Wave
but sensitivity is quite good. I use a  = 136kHz=20 bandpass filter with a
-60dB notch at 200kHz and better than -40dB = for all=20 frequencies above
that. The Rx filter is normally set to 2.1kHz USB = and=20 there is a useful
notch filter.

There is a choice of antenna = and=20 preamps. One antenna is effectively a
sloper, 10M of open-wire = feeder at 45=20 degrees connected to a horizontal
delta loop of about 140M total = length.=20 This can be used with the Tx
loading coil to tune, or a tuned preamp = with=20 about 20dB boost at 136khz.
The other is a 1m square of 10mm copper = tube,=20 broadly tuned into an
in-built  +10dB preamp which will take = about=20 200mVp-pk  input before
clipping. The earth/ground system is=20 extensive.

Naturally an alternative receiver would be good but I = have=20 nothing
available, the FT817 and FT897 seem quite deaf at LF. Any=20 suggestions
would be welcome,

Hugh, M0DSZ.

PS: I will = probably=20 be on 136khz this weekend with about 200W dc into a
linear amplifier = but=20 will note listening activity in case it's all=20
elsewhere.

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