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=FREEMAIL_FORGED_FROMDOMAIN, FREEMAIL_FROM,HEADER_FROM_DIFFERENT_DOMAINS,HTML_MESSAGE,RCVD_IN_DNSWL_MED, SPF_PASS,T_DKIM_INVALID autolearn=ham autolearn_force=no version=3.4.0 X-Spam-DCC: EATSERVER: mailn 1166; 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 v5HBOJro027121 for ; Sat, 17 Jun 2017 13:24:20 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1dMBmA-0003O3-7Z for rs_out_1@blacksheep.org; Sat, 17 Jun 2017 12:20:22 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1dMBm3-0003Nu-T3 for rsgb_lf_group@blacksheep.org; Sat, 17 Jun 2017 12:20:15 +0100 Received: from mail-qk0-x22d.google.com ([2607:f8b0:400d:c09::22d]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.89) (envelope-from ) id 1dMBm0-0000QC-S9 for rsgb_lf_group@blacksheep.org; Sat, 17 Jun 2017 12:20:14 +0100 Received: by mail-qk0-x22d.google.com with SMTP id a199so7549858qkb.2 for ; Sat, 17 Jun 2017 04:20:12 -0700 (PDT) X-DKIM-Result: Domain=gmail.com Result=Good and Known Domain DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:from:date:message-id:subject:to; bh=peh/gWP0h75fUafF1xYin2AWDMzL96Mea32/izc6ths=; b=XRjxq50GorudF7kO570f2RJfsxBWsNNr0e8Q7V6LEtEadNV2JwxOZ80HiEvwe4ECIf sby+kw6QJjq0ZOvQM+tRfyoBP0rsXczxoQyimyxdD7rFS1UVQw6g1ILYRnnRrq6e7PtK rJpP2fxC3nytupZ87IRiSHH8OpnPQJ1YzYpN6Cxgn1Q0Jv95/+MqX66GLaFoBywnmKoh bBwoOz6fFiEkimjjDEDUOedjGe8MryDL90aElPkoL/pZ6UqCMdfKKkoSL/KU/tMj4xlT /8M+pHe2ynbHIo1xZWKrNivvxNcbvWmMHgw4FuZzoi2Bs4WIl19eRRsc6RT3YtpQiavi ZfbA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:from:date:message-id:subject:to; bh=peh/gWP0h75fUafF1xYin2AWDMzL96Mea32/izc6ths=; b=Ge8F4xvKcgY9o8AgLRywQLMILQ1WJxEyooLpPF5sbtorOCQ2LAaGPyxavRZ/hF4fRg CzV4WHY4cuhezQIREK1i30/gwkTmG4tQnczR5du25+ITgK3/W4+OBu+BbWiDpmSGUwBU 40JdB58nXx0e/aApgz81HEXMmNFiPyK6DmW9fx4Sp4mdgFpCbCKROfcZImi5zNIno82m +QBPJWAasWm6xzgBFBV9Ov9KlQJ4Aq3+Im5+NDovBPpbBxS0lR3HxN0tE0KjVrBuvyCN GNeSvZG4BLs8PpANIHZeLyFTsaeZjr7Cwhr5uPbGD0nRYfxbv8jXbbSQy4G7ncM3mOIh mVsw== X-Gm-Message-State: AKS2vOwxQfkcMhtop+5QozwXRsK2ZZCciN2mp3x9o+aVUprKZu9vZYEl CnTvVN8aRnJAJSeDE937MI/iBog/iw== X-Received: by 10.55.122.133 with SMTP id v127mr18095389qkc.129.1497698411308; Sat, 17 Jun 2017 04:20:11 -0700 (PDT) MIME-Version: 1.0 Received: by 10.200.45.48 with HTTP; Sat, 17 Jun 2017 04:20:10 -0700 (PDT) From: Chris Osborn Date: Sat, 17 Jun 2017 12:20:10 +0100 Message-ID: To: LF Group X-Scan-Signature: fc152e7304849b9a177649b85aea9f41 Subject: LF: WSPR problems Content-Type: multipart/alternative; boundary="94eb2c05e0e2c96a7c055226152d" 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: 11995 --94eb2c05e0e2c96a7c055226152d Content-Type: text/plain; charset="UTF-8" GA LF, I have a recurring problem with my home made LF WSPR TX :- As the PC's audio signal shuts down (after the nominal 2 minute transmission time) it picks up RF - this is fed back to the TX input causing several seconds of instability. Has anyone else had this trouble and/or knows of a simple solution? I've tried putting ferrite rings around the PC's input and output cables which solved the problem for a while. In desperation I'm considering adding a monostable to ground the TX input for a few seconds after the PC's AF shuts down, but this will be a last resort. Any useful advice or comments would be most welcome. 73 Chris (G3XIZ) --94eb2c05e0e2c96a7c055226152d Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
GA LF,

I have a= recurring problem with my home made LF WSPR TX=C2=A0 :-

As th= e PC's audio signal shuts down (after the nominal 2 minute=C2=A0 transm= ission time) it picks up RF=C2=A0 -=C2=A0 this is fed back to the TX input = causing several seconds of instability.

Has anyone else had th= is trouble and/or knows of a simple solution?

I've tried p= utting ferrite rings around the PC's input and output cables which solv= ed the problem for a while.

In desperation I'm considering= adding a monostable to ground the TX input for a few seconds after the PC&= #39;s AF shuts down, but this will be a last resort.

Any = useful advice or comments would be most welcome.

73
Chris (G3XIZ)
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