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Sat, 1 Oct 2016 09:00:02 +0000 Received: from DB6PR1001MB1320.EURPRD10.PROD.OUTLOOK.COM (10.152.18.51) by VE1EUR03FT045.mail.protection.outlook.com (10.152.19.51) 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; Sat, 1 Oct 2016 09:00:01 +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 15.01.0639.013; Sat, 1 Oct 2016 09:00:01 +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+/4OJF6ULHytQbWOITjhf0uBrwEZCNwAABiClQA= Date: Sat, 1 Oct 2016 09:00:01 +0000 Message-ID: References: In-Reply-To: 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 10.152.18.51) smtp.mailfrom=outlook.com; blacksheep.org; dkim=none (message not signed) header.d=none;blacksheep.org; 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x-ms-office365-filtering-correlation-id: 231871e5-21b0-4a4d-a938-08d3e9d952fc x-microsoft-antispam: UriScan:;BCL:0;PCL:0;RULEID:(1601124038)(1603103081)(1601125047);SRVR:VE1EUR03HT125; x-exchange-antispam-report-cfa-test: BCL:0;PCL:0;RULEID:(432015012)(82015046);SRVR:VE1EUR03HT125;BCL:0;PCL:0;RULEID:;SRVR:VE1EUR03HT125; x-forefront-prvs: 00826B6158 spamdiagnosticoutput: 1:99 spamdiagnosticmetadata: NSPM MIME-Version: 1.0 X-OriginatorOrg: outlook.com X-MS-Exchange-CrossTenant-originalarrivaltime: 01 Oct 2016 09:00:01.7642 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Internet X-MS-Exchange-CrossTenant-id: 84df9e7f-e9f6-40af-b435-aaaaaaaaaaaa X-MS-Exchange-Transport-CrossTenantHeadersStamped: VE1EUR03HT125 X-OriginalArrivalTime: 01 Oct 2016 09:00:05.0657 (UTC) FILETIME=[33F69890:01D21BC2] X-Scan-Signature: a61717882aa7c2aaf7981d9ec053f562 Subject: RE: LF: good night on MF WSPR @G7NKS 1933km @ 50mW erp - winter plans Content-Type: multipart/alternative; boundary="_000_DB6PR1001MB1320C6707A0C5DF76C214438ECC00DB6PR1001MB1320_" 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: 8890 --_000_DB6PR1001MB1320C6707A0C5DF76C214438ECC00DB6PR1001MB1320_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Makes a change!! :) 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 Roger Lapthorn Sent: 30 September 2016 22:18 To: rsgb_lf_group@blacksheep.org Subject: Re: LF: good night on MF WSPR @G7NKS 1933km @ 50mW erp - winter pl= ans Well done Jim. You sound pretty organised this season! 73s Roger G3XBM On 25 September 2016 at 08:11, James Cowburn > wrote: Prop'n seems to be improving. Iceland and Finland last night on MF, nearly= 2000km on about 50mW ERP. Roll on the cold dark nights! Simple set up @ G7NKS IC706mk2g via current meter and home brew 7 pole LPF into coax out some 15m= to a tapped loading coil into an inverted L (12m high on a fibreglass tele= scopic pole and 30m top wire across roof) Earthing via a mish-mash of stakes & bonding to oil tank feeder pipe (burie= d) and some steel mesh under patio slabs and block paved drive. Checking via the RigExpert AA1000 analyser shows an impedance of 52 ohm and= a return loss of -25dB @ 474.2khz. For the local IO92 and Newark Sunday = morning net with G3XIZ, M0JXM, G3DXZ, G4GIR occasionally and M0FMT, we use = around 473.3khz and this occassionally warrants a quick tap up or down by h= alf a turn. Also when it rains like today, there's a tweak needed sometime= s as the top wire capacitance to roof changes as it becomes more electrolyt= ic and less air spaced! PC is a Dell Studio 1749 running WSPR 2.12. The IC706mk2G will run at about 25% max power on 472 so about 25w but not a= ll of that is at 472 of course, I estimate I'm getting 50mW ERP using a ver= y helpful spreadsheet/calc provided by Stefan. On a 15% duty cycle it all remains happily cool. 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. 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? 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! The Rx noise doesn't seem to affect my WSPR reception but it does impact on= me hearing G3DXZ (Chas) from Newark on the Sunday Net, so for that I just = run the show on batteries during the Rx overs. When I get "a round Tuit" I am going to follow the very detailed instructio= ns from John in the US and feed the 706 into my recently acquired Hafler Tr= ansnova 3000 (approx 400w). Cheers John. While I will unlikely get 400W I suspect I might get 250W which is 10dB up = on my current input power and hopefully about 500mW ERP and that may be eno= ugh to hop the pond. As for 137KHz and down....... The 706 will generate a very weak signal at 137 probably only around 1mW bu= t if I can get that into the Hafler then that's my net project, work and we= ather permitting. I acquired some coils from the SK estate of the late gre= at G3ACQ and they will happily resonate my "L" onto LF. My other (better) plan is to use the 0dBm output on my Elad FDM Duo and a 1= W broadband RF amp off Ebay to give me 1W output at 137 and feed that into= the Hafler, so plenty to do. The ELAD will also go down to sub 9Khz on the 0dBm output so I may try to r= e-start my dreaming experiments and also try some of Roger G3XBM earth loop= electrode arrangements The local 472 net nr to IO92ub will be on air from about 9am local today an= d most Sundays so feel free to join in! Chris G3XIZ is usually "Net Controller" and "chief documenter". Best 73s Jim Dr. Jim Cowburn G7NKS IO92ub --_000_DB6PR1001MB1320C6707A0C5DF76C214438ECC00DB6PR1001MB1320_ Content-Type: text/html; charset="us-ascii" Content-ID: <26CE40AF0D31864DA3C4CCA74583BEF5@EURPRD10.PROD.OUTLOOK.COM> Content-Transfer-Encoding: quoted-printable <= !--[if !mso]>

Makes a change!!  J

 

With best regards

 

 

Jim

 

 

Dr. Jim Cowburn  G7NKS  IO92ub

From: owner-rsgb_lf_group@blacksheep.or= g [mailto:owner-rsgb_lf_group@blacksheep.org] On Behalf Of Roger Lapthorn
Sent: 30 September 2016 22:1= 8
To: rsgb_lf_group@blacksheep= .org
Subject: Re: LF: good night = on MF WSPR @G7NKS 1933km @ 50mW erp - winter plans

 

Well done Jim. You so= und pretty organised this season!

73s

Roger G3XBM

 

On 25 September 2016 at 08:11, James Cowburn <jim.cowburn@outlook.com> = wrote:

Prop'n seems to be improving.  Iceland and Finland<= /st1:country-region> last night on MF, nearly 2000km on about 50mW ERP.

 

Roll on the cold dark nights!

 

Simple set up @ G7NKS

 

IC706mk2g via current meter and home brew 7 pole LPF into = coax out some 15m to a tapped loading coil into an inverted L (12m high on a fibreglass telescopic pole and 30m top w= ire across roof)

 

Earthing via a mish-mash of stakes & bonding to oil ta= nk feeder pipe (buried) and some steel mesh under patio slabs and block paved drive.

 

Checking via the RigExpert AA1000 analyser shows an impeda= nce of 52 ohm and a return loss of -25dB @ 474.2khz.   For the local IO92 and Newark Sunday morning net wit= h G3XIZ, M0JXM, G3DXZ, G4GIR occasionally and M0FMT, we use around 473.3khz= and this occassionally warrants a quick tap up or down by half a turn.&nbs= p; Also when it rains like today, there's a tweak needed sometimes as the top wire capacitance to roof changes as it becomes= more electrolytic and less air spaced!

 

PC is a Dell Studio 1749  running WSPR 2.12.

 

The IC706mk2G will run at about 25% max power on 472 so ab= out 25w but not all of that is at 472 of course, I estimate I'm getting 50mW ERP using a very helpful spreadsheet/calc prov= ided by Stefan.  

 

On a 15% duty cycle it all remains happily cool.

 

It does have a tendency to fight with our cheap home broad= band 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 ov= er!    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 lin= e of roof top wire as possible to minimise pick up and cross talk, but this= hasn't really been that effective either.

 

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 ma= in office PC. On batteries, I get about S1-3 of noise which is very good, b= ut as soon as the PSU's are used and are under "load" then this r= ockets up to S7-9!  If they are powered on, but not driving the laptops i.e. disconnected, then they have no impact. &= nbsp;  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 connec= ted to it?

 

I've tried putting them in shielded earthed metal boxes (b= iscuit tins!) with no effect. (biscuits were nice though!).  Similarly, stacked ferrite toroids on the mains input= s 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 beast= s which are around 120W to 150W, and run alarmingly warm at times!

 

The Rx noise doesn't seem to affect my WSPR reception but = it does impact on me hearing G3DXZ (Chas) from Newark on the Sunday Net, so for that I just run the show on batteries durin= g the Rx overs.

 

When I get "a round Tuit" I am going to follow t= he very detailed instructions from John in the US and feed the 706 into my recently acquired Hafler Transnova= 3000  (approx 400w).   Cheers John.

 

While I will unlikely get 400W I suspect I might get 250W = which is 10dB up on my current input power and hopefully about 500mW ERP and that may be enough to hop the pond.

 

As for 137KHz and down…….

 

The 706 will generate a very weak signal at 137 probably o= nly around 1mW but if I can get that into the Hafler then that’s my net project, work and weather permitting. =  I acquired some coils from the SK estate of the late great G3ACQ and = they will happily resonate my "L" onto LF.

 

My other (better) plan is to use the 0dBm output on my Ela= d FDM Duo and a 1W broadband RF amp off Ebay  to give me 1W output at 137 and feed that into the Hafler, so plenty= to do.

 

The ELAD will also go down to sub 9Khz on the 0dBm output = so I may try to re-start my dreaming experiments and also try some of Roger G3XBM earth loop electrode arrangements<= /font>

 

The local 472 net nr to IO92ub will be on air from about 9= am local today and most Sundays so feel free to join in!

 

Chris G3XIZ is usually "Net Controller" and &quo= t;chief documenter". 

 

Best 73s 

 

Jim

 

 

Dr. Jim Cowburn  G7NKS   IO9= 2ub

 

 

 

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