Return-Path: X-Spam-DCC: paranoid 1233; Body=2 Fuz1=2 Fuz2=2 X-Spam-Checker-Version: SpamAssassin 3.1.3 (2006-06-01) on lipkowski.org X-Spam-Level: X-Spam-Status: No, score=-0.7 required=5.0 tests=BAYES_00,DNS_FROM_AHBL_RHSBL, RATWARE_GECKO_BUILD 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 u04K8b4B004643 for ; Mon, 4 Jan 2016 21:08:38 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1aGBMX-0007qY-21 for rs_out_1@blacksheep.org; Mon, 04 Jan 2016 20:04:17 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1aGBMH-0007qH-6E for rsgb_lf_group@blacksheep.org; Mon, 04 Jan 2016 20:04:01 +0000 Received: from mtaout006-public.msg.strl.va.charter.net ([68.114.190.31]) by relay1.thorcom.net with esmtp (Exim 4.86) (envelope-from ) id 1aGBLC-0007CU-E3 for rsgb_lf_group@blacksheep.org; Mon, 04 Jan 2016 20:03:59 +0000 Received: from impout005 ([68.114.189.20]) by mtaout006.msg.strl.va.charter.net (InterMail vM.9.00.021.00 201-2473-182) with ESMTP id <20160104200236.MOBK20379.mtaout006.msg.strl.va.charter.net@impout005>; Mon, 4 Jan 2016 14:02:36 -0600 Received: from [192.168.1.100] ([68.118.229.27]) by impout005 with charter.net id 1w2c1s00C0c6mLs01w2c4A; Mon, 04 Jan 2016 14:02:36 -0600 X-Authority-Analysis: v=2.1 cv=H4dVwooi c=1 sm=1 tr=0 a=WLV0DKOOKFWiVcf2giHCRw==:117 a=WLV0DKOOKFWiVcf2giHCRw==:17 a=hOpmn2quAAAA:8 a=IkcTkHD0fZMA:10 a=QejfARXMAAAA:8 a=pGLkceISAAAA:8 a=CjxXgO3LAAAA:8 a=GoqwstHNAAAA:8 a=jUcGwpxeFV0czFGaRnQA:9 a=6r2V2e0pDWMPXmGt:21 a=6bd9mQeAG85z3KVN:21 a=QEXdDO2ut3YA:10 a=oTwB1A9rbfsA:10 a=5letXc1NyAMA:10 X-Auth-id: dzF0YWdAY2hhcnRlci5uZXQ= To: rsgb_lf_group@yahoogroups.co.uk, rsgb_lf_group@blacksheep.org References: <568A4048.4000001@vsas.de> <568A7620.7010506@gmx.de> <568AC4A5.4030407@charter.net> From: John Andrews Message-ID: <568ACFE2.7030401@charter.net> Date: Mon, 4 Jan 2016 15:02:42 -0500 User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:38.0) Gecko/20100101 Thunderbird/38.5.0 MIME-Version: 1.0 In-Reply-To: X-Scan-Signature: 69d86b33142413363dd56bd312139bf4 Subject: Re: [rsgb_lf_group] Re: LF: DL-SWL Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit 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: 6112 Andy, It's still alive, but infrequently used. DL4YHF did a GUI version of the original command-line program. It can be found at: http://www.qsl.net/d/dl4yhf/wolf/index.html I just spent an afternoon/evening running it on January 1. Have to keep the thing alive. Received a half-dozen reports from the eastern U.S. and Canada. Didn't bother to publicize it here, due to band conditions. WOLF is of course, 10 bit/sec BPSK. A linear PA is recommended for preserving the nominal 40 Hz BW. This has limited the implementation, as has the need for an SSB exciter, though the latter are more common now, due to the popularity of WSPR. Curiously, the linear PA issue seems more important in EU than here in the U.S., where a number of people are using repurposed audio amplifiers for other modes. It's probably a power consumption thing, with higher prices on the EU side. In any case, the minimum signal levels required are similar to QRSS60, and you have control over the 15 character text being sent. I've been involved with a couple of 2-way QSO's over the years. With 15 characters, you can design a reasonably terse format, but are not stuck with the predetermined requirements of some of the JT modes. Anyway, if anyone wants a weak WOLF test signal, or advice, I'd be happy to help. My shack should be back in operating shape in a day or so, after some computer surgery. John, W1TAG On 1/4/2016 2:38 PM, Andy Talbot andy.g4jnt@gmail.com [rsgb_lf_group] wrote: > > > Indeed - > What happened to WOLF (*) ? > > I've just tried Googling (**) it and find practically no hits. The data > mode seems to have been used successfully in the years around 2001 and > on, for a bit, but has faded. The URL I had for it is now gives the > magic 404. Didn't the first transatlantic contact on 137kHz use this mode? > > I guess that as it used 10 baud BPSK, was considered too complicated > for the average LF Op. to generate. No one seems to use upconversion > from audio, and few seem to be able to make simple PSK encoders. Even > for EBnaut, relays are suggested as the means to reverse the phase > (yes, truely !!). I suppose, to be fair, 10 baud unfiltered BPSK from > a high power transmitter is a bit unkind to other band users. > > Andy G4JNT > > (*) Weak signal Operation at LF > (**) Other search engines are available - so it has been said. > > > On 4 January 2016 at 19:14, John Andrews > wrote: > > For those who may be newer to this part of our hobby, Hartmut Wolff > is somewhat of a legend in receiving TA signals in the 137 kHz band. > Night after night while others could only see Loran lines and the > debris from DCF39, Hartmut produced screenshots of some pretty weak > North American signals. He also gave reports on the sadly-orphaned > WOLF mode. As recently as last month, his 137.780 kHz grabber showed > my signal on nights that it was invisible on the UK and other DL > grabbers. > > > > __._,_.___ > ------------------------------------------------------------------------ > Posted by: Andy Talbot > ------------------------------------------------------------------------ > > > Visit Your Group > > > > * New Members > > 1 > * New Photos > > 3 > > Yahoo! Groups > > > • Privacy > • Unsubscribe > > • Terms of Use > > > __,_._,___