Return-Path: X-Spam-DCC: paranoid 1102; 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 t2NKEs2Y009824 for ; Mon, 23 Mar 2015 21:14:54 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1Ya8hx-0001j3-Vy for rs_out_1@blacksheep.org; Mon, 23 Mar 2015 20:12:21 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1Ya8hv-0001ii-BM for rsgb_lf_group@blacksheep.org; Mon, 23 Mar 2015 20:12:19 +0000 Received: from mail-wg0-f54.google.com ([74.125.82.54]) by relay1.thorcom.net with esmtps (TLSv1.2:AES128-GCM-SHA256:128) (Exim 4.85) (envelope-from <73dk7fc@googlemail.com>) id 1Ya8hs-0000Pk-Nr for rsgb_lf_group@blacksheep.org; Mon, 23 Mar 2015 20:12:18 +0000 Received: by wgs2 with SMTP id 2so48087233wgs.1 for ; Mon, 23 Mar 2015 13:12:16 -0700 (PDT) X-DKIM-Result: Domain=googlemail.com Result=Good and Known Domain DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=googlemail.com; s=20120113; h=from:message-id:date:user-agent:mime-version:to:subject:references :in-reply-to:content-type:content-transfer-encoding; bh=/pnf8YayuypWNv0WTplAbFHL8P54x0ecgvF7Pt4yrMI=; b=ImcWB0gZqAJv4IQu6qYntz/4CL4ijDcGXiRJE4w3dQiWxBDQq2Yic1pHzLtW7+EUP3 ns1ni705r41xuNWHU+gsiv3Kid11wzYMLFFAzo0L/pV31Pmo58vQgOUQn9CSJy3vgck1 xhXfKzmnXglRMB2lcdYSOjQM8X1PUS/z4iBXQs6lbiB4NdQ9Qz/+Q1w1nPEeF2LUbwo7 a177b2rmMNyzKAewEaSuKCtwK14DKFmI9YTseXf9MHrW5AzzEAKvw0pBfxhVptXkRSxj BlLI2MvRtnoiHmP0Axhj8QluneakBOOl+Gl0W1sadYbU2rIvAejs56OOdgI4wc01xEec XRvA== X-Received: by 10.180.76.148 with SMTP id k20mr22509932wiw.71.1427141535966; Mon, 23 Mar 2015 13:12:15 -0700 (PDT) Received: from [129.206.22.206] (pc206.iup.uni-heidelberg.de. [129.206.22.206]) by mx.google.com with ESMTPSA id ch6sm2937389wjc.3.2015.03.23.13.12.14 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Mon, 23 Mar 2015 13:12:15 -0700 (PDT) From: DK7FC <73dk7fc@googlemail.com> X-Google-Original-From: DK7FC <73dk7fc@gmail.com> Message-ID: <5510739E.9040006@gmail.com> Date: Mon, 23 Mar 2015 21:12:14 +0100 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: <4698D0522AFD45F896A41F2D16A2D831@AGB> <19EEF7A6DD30462FA6ACC0F015DC9F52@AGB> <5509E3D5.90900@gmail.com> <55102D0C.8040405@gmail.com> <551043CD.3090102@gmail.com> In-Reply-To: X-Scan-Signature: f38d515a9cad1e977fcfe251941a8120 Subject: Re: LF: TXing WSPR on 630m on a Raspberry Pi, Stefan in QRPPPP... Content-Type: text/plain; charset=ISO-8859-1; 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 2.56 on 10.1.3.10 Status: O X-Status: X-Keywords: X-UID: 2778 Hi Mauro, Yes, for a TX power below 20 dBm i do not care to much about spectrum so i just spent a simple pi filter. For higher power levels i would use a higher order filter, like my PA does anyway. I can see the in-band-spectrum on my local receiver at http://www.iup.uni-heidelberg.de/schaefer_vlf/DK7FC_remote_Grabber.html (RX still on the table here for testing) with > 50 dB SNR. Here, the spectrum looks very clean. 73, Stefan Am 23.03.2015 19:20, schrieb IK1WVQ Mauro: > Hi Stefan, > I use the RASPY from 2 years to produce WSPR and QRSS (I wrote a > software to do this). > > Consider what the RF is produced by the internal fractional-divider > "modulated" by a DMA sequence, to increase the resolution of the > fractional_divider. > > The result is a NOT SO CLEAN spectrum !!! take a lock with a spectrum > analyzer !! > > When used with lo power this is not a problem (my "PA" in HF is a > 74AC541 all paralleled.. 450mW @ 30meters) > > My QRSS software can use only the fractional divider, without DMA .. > The spectrum is VERY clean, but it is impossible to generate the WSPR > tone .. only QRSS, CW and OPERA ... > > 73 de Mauro IK1WVQ > > >