Return-Path: X-Spam-DCC: paranoid 1102; 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=-2.2 required=5.0 tests=BAYES_00,DNS_FROM_AHBL_RHSBL, FORGED_RCVD_HELO 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 t2NIOj91009509 for ; Mon, 23 Mar 2015 19:24:51 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1Ya6yr-0001EF-LG for rs_out_1@blacksheep.org; Mon, 23 Mar 2015 18:21:41 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1Ya6yr-0001E6-DB for rsgb_lf_group@blacksheep.org; Mon, 23 Mar 2015 18:21:41 +0000 Received: from smtpdg227.aruba.it ([62.149.158.227]) by relay1.thorcom.net with esmtp (Exim 4.85) (envelope-from ) id 1Ya6yp-0008VN-RG for rsgb_lf_group@blacksheep.org; Mon, 23 Mar 2015 18:21:40 +0000 Received: from PC-MAURO.stmb.it ([82.48.195.83]) by smtpcmd03.ad.aruba.it with bizsmtp id 76Mc1q00J1oS1LJ016McCD; Mon, 23 Mar 2015 19:21:37 +0100 X-Mailer: QUALCOMM Windows Eudora Version 7.1.0.9 Date: Mon, 23 Mar 2015 19:20:55 +0100 To: rsgb_lf_group@blacksheep.org, rsgb_lf_group@blacksheep.org From: IK1WVQ Mauro In-Reply-To: <551043CD.3090102@gmail.com> References: <4698D0522AFD45F896A41F2D16A2D831@AGB> <19EEF7A6DD30462FA6ACC0F015DC9F52@AGB> <5509E3D5.90900@gmail.com> <55102D0C.8040405@gmail.com> <551043CD.3090102@gmail.com> Mime-Version: 1.0 X-Scan-Signature: 7aa9ad08848e488e22e0ff1d71f4ef1d Message-Id: Subject: Re: LF: TXing WSPR on 630m on a Raspberry Pi, Stefan in QRPPPP... Content-Type: text/plain; charset="us-ascii"; format=flowed 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: 2774 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