Return-Path: X-Spam-DCC: paranoid 1290; 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, HTML_MESSAGE,RATWARE_GECKO_BUILD,SPF_PASS 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 u8PAKrNv027986 for ; Sun, 25 Sep 2016 12:20:53 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1bo6Ux-0000g7-23 for rs_out_1@blacksheep.org; Sun, 25 Sep 2016 11:17:27 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1bo6Uu-0000fy-Ml for rsgb_lf_group@blacksheep.org; Sun, 25 Sep 2016 11:17:24 +0100 Received: from mout02.posteo.de ([185.67.36.66]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.87) (envelope-from ) id 1bo6Us-0007na-Rg for rsgb_lf_group@blacksheep.org; Sun, 25 Sep 2016 11:17:23 +0100 Received: from submission (posteo.de [89.146.220.130]) by mout02.posteo.de (Postfix) with ESMTPS id 1DF492085E for ; Sun, 25 Sep 2016 12:17:12 +0200 (CEST) Received: from customer (localhost [127.0.0.1]) by submission (posteo.de) with ESMTPSA id 3shjh74SFqzyNW for ; Sun, 25 Sep 2016 12:17:10 +0200 (CEST) Message-ID: <57E7A426.90601@posteo.de> Date: Sun, 25 Sep 2016 12:17:10 +0200 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: In-Reply-To: X-Scan-Signature: 7ee575a0a6578bbbbe5ea7af32688fd5 Subject: Re: LF: good night on MF WSPR @G7NKS 1933km @ 50mW erp - winter plans Content-Type: multipart/alternative; boundary="------------050904060100060601090308" 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 10.1.3.11 Status: O X-Status: X-Keywords: X-UID: 8842 This is a multi-part message in MIME format. --------------050904060100060601090308 Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 7bit Hello Jim, Thanks for the interesting read of your station :-) Am 25.09.2016 09:11, schrieb James Cowburn: > PC is a Dell Studio 1749 running WSPR 2.12. I can really recommend the use of the new WSJT-X v1.7.0 software which includes WSPR-2. At least for reception it improves things. > It does have a tendency to fight with our cheap home broadband router > supplied by British Telecom, resulting in the "Orange Light of Death" > and subsequent grief from XYL and 2 teenagers as their Netflix/Music > stream/Online gaming has just fallen over! Ferrite toroids have > been spectacularly unsuccessful in remedying this. The best solution > has been to try to run the CAT5 cables in my office as perpendicular > to the coax feed and line of roof top wire as possible to minimise > pick up and cross talk, but this hasn't really been that effective either. > What about WLAN / wifi? > > A bigger issue on Rx is the noise pick up from both Dell (genuine kit > and not cheap copies either, which is annoying!) PSUs that feed the > Studio and the XPS17 which is my main office PC. On batteries, I get > about S1-3 of noise which is very good, but as soon as the PSU's are > used and are under "load" then this rockets up to S7-9! If they are > powered on, but not driving the laptops i.e. disconnected, then they > have no impact. I'm wondering if it is the load that makes them > noisier or whether the whole laptop acts as an augmented antenna when > they are connected to it? > Does the QRM become lower when disconnecting the CAT5 / LAN cable? Some years ago i observed some common mode QRM just by a notebook, its supply and a connected LAN cable. If you take use WLAN instead, you may have lower QRM and also do not disturb the LAN traffic. > I've tried putting them in shielded earthed metal boxes (biscuit > tins!) with no effect. (biscuits were nice though!). Similarly, > stacked ferrite toroids on the mains inputs and DC power out have had > zero impact. They both have a very bright blue LED on the power cable > whereas older units for my Dell D610/20 series did not have this > "bauble" and were much quieter, but also were lower rated at 60W or > 90W as opposed to these beasts which are around 120W to 150W, and run > alarmingly warm at times! > If it is no common mode problem with the LAN cable i would try to switch a pi-network in front of the power supply, on the 230V side. 2x 1 uF (e.g. WIMA MP3-X2 250VAC) and then a iron powder choke (e.g. T106-26) with many turns of 0.5mm cu wire, two windings, "anti-parallel". 73, Stefan --------------050904060100060601090308 Content-Type: text/html; charset=windows-1252 Content-Transfer-Encoding: 8bit Hello Jim,

Thanks for the interesting read of your station :-)

Am 25.09.2016 09:11, schrieb James Cowburn:
PC is a Dell Studio 1749  running WSPR 2.12.
I can really recommend the use of the new WSJT-X v1.7.0 software which includes WSPR-2. At least for reception it improves things.
 

It does have a tendency to fight with our cheap home broadband router supplied by British Telecom, resulting in the "Orange Light of Death" and subsequent grief from XYL and 2 teenagers as their Netflix/Music stream/Online gaming has just fallen over!    Ferrite toroids have been spectacularly unsuccessful in remedying this.  The best solution has been to try to run the CAT5 cables in my office as perpendicular to the coax feed and line of roof top wire as possible to minimise pick up and cross talk, but this hasn't really been that effective either.

What about WLAN / wifi?

 

A bigger issue on Rx is the noise  pick up from both Dell (genuine kit and  not cheap copies either, which is annoying!) PSUs that feed the Studio and the XPS17 which is my main office PC. On batteries, I get about S1-3 of noise which is very good, but as soon as the PSU's are used and are under "load" then this rockets up to S7-9!  If they are powered on, but not driving the laptops i.e. disconnected, then they have no impact.    I'm wondering if it is the load that makes them noisier or whether the whole laptop acts as an augmented antenna when they are connected to it?

Does the QRM become lower when disconnecting the CAT5 / LAN cable? Some years ago i observed some common mode QRM just by a notebook, its supply and a connected LAN cable. If you take use WLAN instead, you may have lower QRM and also do not disturb the LAN traffic.

I've tried putting them in shielded earthed metal boxes (biscuit tins!) with no effect. (biscuits were nice though!).  Similarly, stacked ferrite toroids on the mains inputs and DC power out have had zero impact.  They both have a very bright blue LED on the power cable whereas older units for my Dell D610/20 series did not have this "bauble" and were much quieter, but also were lower rated at 60W or 90W as opposed to these beasts which are around 120W to 150W, and run alarmingly warm at times!

If it is no common mode problem with the LAN cable i would try to switch a pi-network in front of the power supply, on the 230V side. 2x 1 uF (e.g. WIMA MP3-X2 250VAC) and then a iron powder choke (e.g. T106-26) with many turns of 0.5mm cu wire, two windings, "anti-parallel".

73, Stefan
 --------------050904060100060601090308--