Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by klubnl.pl (8.14.4/8.14.4/Debian-8+deb8u2) with ESMTP id w1HLcXOO031280 for ; Sat, 17 Feb 2018 22:38:36 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1enA5y-0004Hg-Rk for rs_out_1@blacksheep.org; Sat, 17 Feb 2018 21:32:34 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1enA5M-0004HX-EU for rsgb_lf_group@blacksheep.org; Sat, 17 Feb 2018 21:31:56 +0000 Received: from mout01.posteo.de ([185.67.36.65]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.89) (envelope-from ) id 1enA5J-0000PP-6v for rsgb_lf_group@blacksheep.org; Sat, 17 Feb 2018 21:31:54 +0000 Received: from submission (posteo.de [89.146.220.130]) by mout01.posteo.de (Postfix) with ESMTPS id BF51020DFA for ; Sat, 17 Feb 2018 22:31:51 +0100 (CET) X-DKIM-Result: Domain=posteo.de Result=Signature OK DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=posteo.de; s=2017; t=1518903111; bh=S1k8rrUsMTnVxY9lxp4bVJOcicL1jWKfvLdWVolqj4U=; h=Date:From:To:Subject:From; b=QXGI+wMaTe92hd36C2qyHtvpYrHPROssbnScCe8dDN+tHymTtTq5UN72XfTLgGfit nRVhgPbaHBFYg/8IRJHiLJP+rzymFwWfULMQvHl6Ow/EpilejKk54erLUx5eLw+glP nq6t7BmEirgi5s5LFZBoCg2FOtJrW+ImJTdZIyYgvB5km6Bd6Bl52FH92aCp7QiVHV 4sJKcDkjJVncidet43/LQEkzptPHLA6cJmPKRFjcGfxykrAji63Mob+MBg5nhWvs6G msN3KsfqS/D9sjVhdPlKkppz/7pkRBc+YBfej1Xit/uK5DHVWo5bskz/mXuvH7t1Wz 1cCaPxUa6pTNg== Received: from customer (localhost [127.0.0.1]) by submission (posteo.de) with ESMTPSA id 3zkNWC0s58z9rxN for ; Sat, 17 Feb 2018 22:31:50 +0100 (CET) Message-ID: <5A889F44.5070205@posteo.de> Date: Sat, 17 Feb 2018 22:31:48 +0100 From: DK7FC User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; de; rv:1.9.1.8) Gecko/20100227 Thunderbird/3.0.3 MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org References: <52dea779-7aae-aff8-1072-ad24cdcd007c@freenet.de> <4024a3ab-eb61-7801-e9ad-5715c5f49546@abelian.org> <9a7cf91a-5643-9149-28a7-ce6d282db3e9@abelian.org> <1555f07a-f2a3-fb55-c246-f52442a1a723@freenet.de> <4ac6d43f-85c7-bd05-85b9-5b64ebcfbf35@abelian.org> <2f6a408a-af27-9c9b-b116-7becd9b1c66f@abelian.org> <6eced61e-a7ce-2935-195d-4a76f375b11e@freenet.de> <633c1982-97fe-7d9d-7f69-07e3503147bb@abelian.org> <5A88244B.1020304@posteo.de> <1b3df450-bb19-b667-b784-17c8b48917db@abelian.org> In-Reply-To: <1b3df450-bb19-b667-b784-17c8b48917db@abelian.org> X-Spam-Score: 0.0 (/) X-Spam-Report: Spam detection software, running on the system "relay1.thorcom.net", has NOT identified this incoming email as spam. The original message has been attached to this so you can view it or label similar future email. If you have any questions, see the administrator of that system for details. Content preview: ...oh, then it may help to switch a impedance converter between the pulse forming RC network, like a non-inverting OP with gain 1. 73, Stefan Am 17.02.2018 22:09, schrieb Paul Nicholson: > > > These glitches on the Octo input occur as the input signal > passes through about +/- 1.4 volts. Regardless of the > digital gain control setting. > > Still present if I bypass the input board and wire straight > into the differential inputs on the Octo card. > > Vanishes if I sample at 48k/sec instead of 96k/sec. I get > about 30nS jitter on the PPS at 48k/sec. > > To eliminate vlfrx-tools I reproduced the fault using arecord > into sox to convert to ASCII data and then plot with gnuplot, > > Occurs on two specimens of Octo and two Pi. > > If I keep the input signal below 1.4 volts, there are no > noticeable artifacts but the PPS jitter is still no better > than about 200nS at 96k/sec. The PPS is visibly noisy on > the scope at 96k/sec but looks clean at 48k/sec. > > Tomorrow I'll look at the noise floor at various sample rates. > > -- > Paul Nicholson > -- > [...] Content analysis details: (0.0 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 T_RP_MATCHES_RCVD Envelope sender domain matches handover relay domain 0.0 T_DKIM_INVALID DKIM-Signature header exists but is not valid X-Scan-Signature: 086f3faad0220c9ae57a7913e711a86d Subject: Re: LF: Testing Audioinjector Octo with RPi3 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.0 required=5.0 tests=none 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 ...oh, then it may help to switch a impedance converter between the pulse forming RC network, like a non-inverting OP with gain 1. 73, Stefan Am 17.02.2018 22:09, schrieb Paul Nicholson: > > > These glitches on the Octo input occur as the input signal > passes through about +/- 1.4 volts. Regardless of the > digital gain control setting. > > Still present if I bypass the input board and wire straight > into the differential inputs on the Octo card. > > Vanishes if I sample at 48k/sec instead of 96k/sec. I get > about 30nS jitter on the PPS at 48k/sec. > > To eliminate vlfrx-tools I reproduced the fault using arecord > into sox to convert to ASCII data and then plot with gnuplot, > > Occurs on two specimens of Octo and two Pi. > > If I keep the input signal below 1.4 volts, there are no > noticeable artifacts but the PPS jitter is still no better > than about 200nS at 96k/sec. The PPS is visibly noisy on > the scope at 96k/sec but looks clean at 48k/sec. > > Tomorrow I'll look at the noise floor at various sample rates. > > -- > Paul Nicholson > -- >