Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on lipkowski.org X-Spam-Level: X-Spam-Status: No, score=-2.3 required=5.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, RCVD_IN_DNSWL_MED,SPF_PASS,T_DKIM_INVALID autolearn=ham autolearn_force=no version=3.4.0 X-Spam-DCC: : mailn 1480; Body=2 Fuz1=2 Fuz2=2 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by lipkowski.org (8.14.4/8.14.4/Debian-8+deb8u1) with ESMTP id v19Nc5gZ011763 for ; Fri, 10 Feb 2017 00:38:06 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1cbyEl-0001uc-0K for rs_out_1@blacksheep.org; Thu, 09 Feb 2017 23:34:51 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1cbyEk-0001uT-Lg for rsgb_lf_group@blacksheep.org; Thu, 09 Feb 2017 23:34:50 +0000 Received: from porthos.netcom.co.uk ([217.72.171.73]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.87) (envelope-from ) id 1cbyEi-0007pf-6W for rsgb_lf_group@blacksheep.org; Thu, 09 Feb 2017 23:34:49 +0000 X-DKIM-Result: Domain=abelian.org Result=Signature OK DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=abelian.org ; s=default; h=Content-Transfer-Encoding:Content-Type:In-Reply-To: MIME-Version:Date:Message-ID:From:References:To:Subject:Sender:Reply-To:Cc: Content-ID:Content-Description:Resent-Date:Resent-From:Resent-Sender: Resent-To:Resent-Cc:Resent-Message-ID:List-Id:List-Help:List-Unsubscribe: List-Subscribe:List-Post:List-Owner:List-Archive; bh=UoRde7oGOkBtbVYmRsL+YTVkTeDpkaMTtUpDXHAJCwQ=; b=8ikI6aV0iV3dy8M7J0xSWLUGS8 9Fy1V9ZB/SwGvi6pOr1safhbkpoTGkzHI/iEMEnDjqNETWJqnwJR1lumwSk9aBWVsJCuDuIqrLdQ1 +nb5Fo1J87chcJcelQVqSPMLxLixS9jfq8nO3fJjEIU1Ux4odXG0cPZ5RjZednuZS384=; Received: from i-194-106-52-83.freedom2surf.net ([194.106.52.83]:42205 helo=pn.abelian.org) by porthos.netcom.co.uk with esmtpsa (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.88) (envelope-from ) id 1cbyEh-0001Dr-Ff for rsgb_lf_group@blacksheep.org; Thu, 09 Feb 2017 23:34:47 +0000 Received: from [127.0.0.1] (localhost [127.0.0.1]) by pn.abelian.org (Postfix) with ESMTP id DEBCE400646 for ; Thu, 9 Feb 2017 23:34:46 +0000 (UTC) To: rsgb_lf_group@blacksheep.org References: <15a24e5d70b-7ac8-1880b@webprd-m102.mail.aol.com> From: Paul Nicholson Message-ID: Date: Thu, 9 Feb 2017 23:34:46 +0000 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.5.1 MIME-Version: 1.0 In-Reply-To: X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - porthos.netcom.co.uk X-AntiAbuse: Original Domain - blacksheep.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - abelian.org X-Get-Message-Sender-Via: porthos.netcom.co.uk: authenticated_id: catchall@abelian.org X-Authenticated-Sender: porthos.netcom.co.uk: catchall@abelian.org X-Scan-Signature: 5c335215f1b3de26d890ee84d49616ce Subject: Re: LF: EbNaut beaconing on LF Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit 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 2.75 Status: O X-Status: X-Keywords: X-UID: 10527 Riccardo wrote: > in fact the bandwidth on your grabber seems larger > than Domenico's EbSynth test signal. The ebsynth settings Domenico is using produce BPSK where the phase is slewed from one polarity to the other. It takes 0.05 of a symbol period to change phase. This is intended to limited the keying transients of the signal when operating at LF or above (on VLF, hard keying is no problem, nobody will complain about the sidebands - you can just use a relay!). I don't really know how effective that slewing is, ebsynth hasn't had much air time. Reports welcome! I can use some other method to constrain the bandwidth if necessary. Testing a mod to ebsynth to control the PTT via com port modem control lines. It works nicely but for one obscure test case: a soundcard with a long output buffer (eg 5.4 seconds on a AUD 20101 USB dongle) combined with a message which is so short that it fits entirely in the buffer. I have an ugly fix for this case, but the fix would fail if you also set a repeat time so short that more than one message was in the output buffer. The solution for that is uglier still. I'll sleep on the problem and in the morning I will have an elegant solution that handles the craziest combinations of long buffers and rapid fire messages. -- Paul Nicholson --