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Sun, 25 Sep 2016 11:53:20 +0000 Received: from DB6PR1001MB1320.EURPRD10.PROD.OUTLOOK.COM (10.152.20.57) by DB5EUR03FT033.mail.protection.outlook.com (10.152.20.76) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384_P384) id 15.1.629.5 via Frontend Transport; Sun, 25 Sep 2016 11:53:20 +0000 Received: from DB6PR1001MB1320.EURPRD10.PROD.OUTLOOK.COM ([10.171.77.147]) by DB6PR1001MB1320.EURPRD10.PROD.OUTLOOK.COM ([10.171.77.147]) with mapi id 15.01.0629.018; Sun, 25 Sep 2016 11:53:20 +0000 From: James Cowburn To: "rsgb_lf_group@blacksheep.org" Thread-Topic: LF: good night on MF WSPR @G7NKS 1933km @ 50mW erp - winter plans Thread-Index: AdIW+/4OJF6ULHytQbWOITjhf0uBrwAGfvAAAANZtgA= Date: Sun, 25 Sep 2016 11:53:20 +0000 Message-ID: References: <57E7A426.90601@posteo.de> In-Reply-To: <57E7A426.90601@posteo.de> Accept-Language: en-GB, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: spf=softfail (sender IP is 10.152.20.57) smtp.mailfrom=outlook.com; 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x-ms-office365-filtering-correlation-id: 5a330773-9a4d-4be0-3f0d-08d3e53a8aa6 x-microsoft-antispam: UriScan:;BCL:0;PCL:0;RULEID:(1601124038)(1603103081)(1601125047);SRVR:DB5EUR03HT068; x-exchange-antispam-report-cfa-test: BCL:0;PCL:0;RULEID:(432015012)(82015046);SRVR:DB5EUR03HT068;BCL:0;PCL:0;RULEID:;SRVR:DB5EUR03HT068; x-forefront-prvs: 0076F48C8A spamdiagnosticoutput: 1:99 spamdiagnosticmetadata: NSPM MIME-Version: 1.0 X-OriginatorOrg: outlook.com X-MS-Exchange-CrossTenant-originalarrivaltime: 25 Sep 2016 11:53:20.1679 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Internet X-MS-Exchange-CrossTenant-id: 84df9e7f-e9f6-40af-b435-aaaaaaaaaaaa X-MS-Exchange-Transport-CrossTenantHeadersStamped: DB5EUR03HT068 X-OriginalArrivalTime: 25 Sep 2016 11:53:38.0339 (UTC) FILETIME=[73ED4730:01D21723] X-Scan-Signature: 4bc3491b614f043141ec87e58a12dcbf Subject: RE: LF: good night on MF WSPR @G7NKS 1933km @ 50mW erp - winter plans Content-Type: multipart/alternative; boundary="_000_DB6PR1001MB13209BD663E821B182ED006DECCA0DB6PR1001MB1320_" 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: 8845 --_000_DB6PR1001MB13209BD663E821B182ED006DECCA0DB6PR1001MB1320_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Hi Stefan see my comments below appended With best regards Jim Dr. Jim Cowburn G7NKS IO92ub ________________________________ From: owner-rsgb_lf_group@blacksheep.org [mailto:owner-rsgb_lf_group@blacks= heep.org] On Behalf Of DK7FC Sent: 25 September 2016 11:17 To: rsgb_lf_group@blacksheep.org Subject: Re: LF: good night on MF WSPR @G7NKS 1933km @ 50mW erp - winter pl= ans 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 incl= udes WSPR-2. At least for reception it improves things. I'll give that = a try! Thanks. Also are you okay if I share the excellent spreadsheet you = sent me some years ago? It's really useful It does have a tendency to fight with our cheap home broadband router suppl= ied by British Telecom, resulting in the "Orange Light of Death" and subseq= uent grief from XYL and 2 teenagers as their Netflix/Music stream/Online ga= ming has just fallen over! Ferrite toroids have been spectacularly unsuc= cessful in remedying this. The best solution has been to try to run the CA= T5 cables in my office as perpendicular to the coax feed and line of roof t= op wire as possible to minimise pick up and cross talk, but this hasn't rea= lly been that effective either. What about WLAN / wifi? The Wifi is okay, it's the cheaply built BT rout= er that is poorly shielded and so picks up my 472khz signals through it's p= aper thin plastic casing (prob because it has internal antennae) and this p= lays havoc with the broadband signals which are in the MF band and superimp= osed onto the phone line. I need a better shielded router with external wi= fi antennae 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 no= ise which is very good, but as soon as the PSU's are used and are under "lo= ad" 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 i= f it is the load that makes them noisier or whether the whole laptop acts a= s an augmented antenna when they are connected to it? Does the QRM become lower when disconnecting the CAT5 / LAN cable? Some yea= rs 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. Interesting!! :) I will give = that a try later. My XYL has demanded I go to a local charity event this a= fternoon so no radio until 5pm!!! I've tried putting them in shielded earthed metal boxes (biscuit tins!) wit= h no effect. (biscuits were nice though!). Similarly, stacked ferrite toro= ids on the mains inputs and DC power out have had zero impact. They both h= ave a very bright blue LED on the power cable whereas older units for my De= ll D610/20 series did not have this "bauble" and were much quieter, but als= o were lower rated at 60W or 90W as opposed to these beasts which are aroun= d 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. WI= MA MP3-X2 250VAC) and then a iron powder choke (e.g. T106-26) with many tur= ns of 0.5mm cu wire, two windings, "anti-parallel". I actusally have a ve= ry good quality old mains supply filter unit built like this, I'll dig that= out and try it. I'd assumed it was just the smpsu part radiating through= the plastic casing and undoubtedly having no filtering applied at the 19.5= output so the power lead to the laptop acts as a great antenna!! The PSU= s are sealed and I don't want to open it if I can avoid it. 73s!! Jim G7NKS IO92ub 73, Stefan --_000_DB6PR1001MB13209BD663E821B182ED006DECCA0DB6PR1001MB1320_ Content-Type: text/html; charset="us-ascii" Content-ID: Content-Transfer-Encoding: quoted-printable

Hi Stefan see my comments below append= ed

 

With best regards

 

 

Jim

 

 

Dr. Jim Cowburn  G7NKS  IO92ub

 

= From: owner-rsgb_lf_group@blacksheep.org [mailto:owner-rsgb_lf_group@blacksheep.or= g] On Behalf Of DK7FC
Sent: 25 September 2016 11:1= 7
To: rsgb_lf_group@blacksheep.org
Subject: Re: LF: good night = on MF WSPR @G7NKS 1933km @ 50mW erp - winter plans

 

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 s= oftware which includes WSPR-2. At least for reception it improves things.     I'll give that a try! Thanks.&nbs= p; Also are you okay if I share the excellent spreadsheet you sent me some = years ago?  It's really useful
 

It does have a tendency to fight with our cheap home broadband router supplie= d by British Telecom, resulting in the "Orange Light of Death" an= d subsequent grief from XYL and 2 teenagers as their Netflix/Music stream/O= nline 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 perpen= dicular 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?   &= nbsp;The Wifi is okay, it's the cheaply built BT router that is poorly shie= lded and so picks up my 472khz signals through it's paper thin plastic casi= ng (prob because it has internal antennae) and this plays havoc with the broadband signals which are in the MF band and superi= mposed onto the phone line.  I need a better shielded router with exte= rnal wifi antennae

 

A bigger issue on Rx is the noise  pick up f= rom both Dell (genuine kit and  not cheap copies either, which is anno= ying!) PSUs that feed the Studio and the XPS17 which is my main office PC. On batteries, I get about S1-3 o= f 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 o= n, but not driving the laptops i.e. disconnected, then they have no impact.    I'm wondering if it is the loa= d 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 / L= AN 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 L= AN traffic.   Interesting!!  J<= span style=3D"font-size:10.0pt;font-family:Arial;color:navy">   I= will give that a try later.  My XYL has demanded I go to a local charity event this = afternoon so no radio until 5pm!!!


I've tried putting them in shielded earthed metal boxes (biscuit tins!) with no= effect. (biscuits were nice though!).  Similarly, stacked ferrite tor= oids 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 &qu= ot;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 alarm= ingly warm at times!

= If it is no common mode problem with the LAN cable i woul= d 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 w= indings, "anti-parallel".   I= actusally have a very good quality old mains supply filter unit built like= this, I'll dig that out and try it.   I'd assumed it was just th= e smpsu part radiating through the plastic casing and undoubtedly having no filtering applied at the 19.5 output so the power lead to the la= ptop acts as a great antenna!!   The PSUs are sealed and I don't = want to open it if I can avoid it.

 

73s!!   Jim = ;  G7NKS   IO92ub 

73, Stefan

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