Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-mk06.r1000.mx.aol.com (Internet Inbound) with ESMTP id 917EE38000082; Wed, 20 Mar 2013 10:45:44 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1UIJwd-0005OY-7l for rs_out_1@blacksheep.org; Wed, 20 Mar 2013 14:24:47 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1UIJwc-0005OP-FP for rsgb_lf_group@blacksheep.org; Wed, 20 Mar 2013 14:24:46 +0000 Received: from smtpa1.mediabeam.com ([194.25.41.13] helo=smtpa2.mediabeam.com) by relay1.thorcom.net with esmtps (TLSv1:AES256-SHA:256) (Exim 4.77) (envelope-from ) id 1UIJwX-0002GT-R5 for rsgb_lf_group@blacksheep.org; Wed, 20 Mar 2013 14:24:45 +0000 Received: from IMAP1 (balancer7.mediabeam.com [10.100.1.80]) by smtpa2.mediabeam.com (8.13.8/8.13.1) with ESMTP id r2KEON4J014595 for ; Wed, 20 Mar 2013 15:24:23 +0100 Date: Wed, 20 Mar 2013 15:21:05 +0100 From: uwe-jannsen@kabelmail.de To: rsgb_lf_group@blacksheep.org Message-ID: <9831c686c62c463a9e66c386e7169eab@kabelmail.de> X-Priority: 3 (Normal) MIME-Version: 1.0 X-Spam-Score: -0.7 (/) X-Spam-Report: Spam detection software, running on the system "relay1.thorcom.net", has identified this incoming email as possible spam. The original message has been attached to this so you can view it (if it isn't spam) or label similar future email. If you have any questions, see the administrator of that system for details. Content preview: congrats Laurence, so one problem has gone. I have got home made problems: feed back from the transmitted signs into the sound cards Im using. so Im playing around with groundings and shieldings. [...] Content analysis details: (-0.7 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.7 RCVD_IN_DNSWL_LOW RBL: Sender listed at http://www.dnswl.org/, low trust [194.25.41.13 listed in list.dnswl.org] -0.0 SPF_PASS SPF: sender matches SPF record 0.0 HTML_MESSAGE BODY: HTML included in message X-Scan-Signature: 67de28f449cc0b0665e273ddd0356e2e Subject: Re: LF: noise mitigation, 8970 reception Ewew etc Content-Type: multipart/alternative; boundary="----9A70E49F21AD443B81B82FBE2AE04971" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: * X-Spam-Status: No, hits=1.1 required=5.0 tests=HTML_MESSAGE,NO_REAL_NAME, PRIORITY_NO_NAME autolearn=no version=2.63 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-aol-global-disposition: G x-aol-sid: 3039ac1d618a5149cb983ef4 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none ------9A70E49F21AD443B81B82FBE2AE04971 Content-type: text/plain; charset=Windows-1252 Content-Transfer-Encoding: quoted-printable congrats Laurence, so one problem has gone=2E I have got home made problems: feed back from the transmitted signs in= to the sound cards Im using=2E so Im playing around with groundings and shieldings=2E GL Uwe/dj8wx Von: rsgb_lf_group@blacksheep=2Eorg Gesendet: 19=2E03=2E2013 14:10 An: rsgb_lf_group@blacksheep=2Eorg Betreff: LF: noise mitigation, 8970 reception Ewew etc Thanks Ewe - the interference=A0 is confirmed as coming from an Alpha X= M2 cable=A0head end "switched mode sort of"=A060V PSU=A0unit anout 1 Km= from my home=A0-=20 The interference is common mode on the coax distribution system=A0but = coupling to the AC line directly and also being coupled into DSL teleph= one=A0lines=A0- all of which are underground here=2E Made interesting D= Fing -=20 I spent the morning out with the=A0 cable lineman who were very suppor= tive - I used an SDR IQ and baby bottle Eprobe and portable laptop out = in the field supplmented by a live "view" of the rx system at KL 1 X vi= a Teamviewer and rx audio via Iphone from SAQ RX - pretty impressive wh= en they swityched off the suppy and the audio and screens went quiet "O= h" said the engineer=2E=2E=2E=2E Now they=A0 have to=A0figure out what to do about=A0it (hopefully as I= think its more than Part 15 allows for)=A0as there are a number of the= se devices out there in the local area - I can actually hear this one a mile away and not close to utility line= s For info here is group of products that appear to be the offenders - n= ote the pseduo square wave output :-(( in the specs http://www=2Ealpha=2Ecom/outside-plant-power/cableups-power-supplies/it= em/xm2-series?category_id=3D105 =20 I dont think its affecting 8970 too much, but I can see multiples up a= nd down the spectrum and given its nature it isnt helping If you scroll down to the Wideband VLF youll see the interference sign= ature at 19KHz - yuck -=A0 http://kl7uk=2Ecom/Alaska=2Ehtml Still looking for you and praying it dries up at your end - lovely wea= ther here though cold is a little biting holding the laptop and balanci= ng the SDR IQ and probe/psu in my jacket pockets at -25C with 20 knots = =A0:-) Oh and HF LF and MF conditions are very poor of course =2E=2E=2E=2E Laurence KL 1 X=A0 we 2 xpq Wasilla AK Date: Tue, 19 Mar 2013 22:02:23 +0100 From: uwe-jannsen@kabelmail=2Ede To: rsgb_lf_group@blacksheep=2Eorg Subject: Re: RE: LF: Decca 5501 mod, conditions, noise mitigation, 897= 0 et al; thanks Laurtence, the WX here is not so pro VLF TXing: it snows and rains without interr= uption=2E kill that cable amp=2E GL Uwe/dj8wx Von: rsgb_lf_group@blacksheep=2Eorg Gesendet: 18=2E03=2E2013 17:22 An: rsgb_lf_group@blacksheep=2Eorg Betreff: RE: LF: Decca 5501 mod, conditions, noise mitigation, 8970 et= al; Grabber on line Uwe - we have some qrm from a local cable company which= Im working on - looks like one of the Cable amps up the road is oscill= ating at 19KHz - ouch - look at my wideband snapper and youll see what = I mean - 40dBm - but it looks clear on 8970 - running now 238uHz Bucket bin - dang VL= F reference station keeps on going off and GPS twinking up here with al= l this Aurorally stuff=2E=2E=2E=2E We are now at 12 day 12 hours night increasing at 5 mins 46 secs per d= ay=2E=2E=2E=2E=2Ebut still -28C last night Laurence KL 1 X Date: Mon, 18 Mar 2013 14:18:53 +0100 From: uwe-jannsen@kabelmail=2Ede To: rsgb_lf_group@blacksheep=2Eorg Subject: Re: LF: Decca 5501 mod, conditions, noise mitigation, 8970 et= al; Hi =A0Laurence, last days I made some tests on 8970Hz, mode CASTLE, shift 0,002Hz tran= smitting the letter =93W=94 in 5000sec/dot=2E Pse see: http://abelian=2Eorg/vlf/fbins=2Eshtml#p=3D1363442400&b=3D080&s=3Dsp the signs could be seen on all grabbers I know=2E Now I changed the speed and the shift to 10000sec/dot and 0,001Hz, I`ll give the PA some coal extra=2E =A0congrats Laurence, so one problem has gone=2E

I have got home made problems: feed back from the transmitted signs int= o the sound cards Im using=2E

so Im playing around with groundings and shieldings=2E

GL
Uwe/dj8wx
Von: rsgb_lf_group@blacksheep=2Eorg
Gesendet: 19=2E03=2E2013 14:10
An: rsgb_lf_group@blacksheep=2Eorg
Betreff: LF: noise mitigation, 8970 reception Ewew etc

Thanks Ewe - the interference  is confirmed as co= ming from an Alpha XM2 cable head end "switched mode sort of" = ;60V PSU unit anout 1 Km from my home -
 
The interference is common mode on the coax distribution system bu= t coupling to the AC line directly and also being coupled into DSL tele= phone lines - all of which are underground here=2E Made inter= esting DFing -
 
I spent the morning out with the  cable lineman who were very supp= ortive - I used an SDR IQ and baby bottle Eprobe and portable laptop ou= t in the field supplmented by a live "view" of the rx system at KL 1 X = via Teamviewer and rx audio via Iphone from SAQ RX - pretty impressive = when they swityched off the suppy and the audio and screens went quiet = "Oh" said the engineer=2E=2E=2E=2E
 
Now they  have to figure out what to do about it (hopefu= lly as I think its more than Part 15 allows for) as there are a nu= mber of these devices out there in the local area -
 
I can actually hear this one a mile away and not close to utility lines=
 
For info here is group of products that appear to be the offen= ders - note the pseduo square wave output :-(( in the specs
 

http://www= =2Ealpha=2Ecom/outside-plant-power/cableups-power-supplies/item/xm2-ser= ies?category_id=3D105


I dont think its affecting 8970 too much, but I can see multiples up an= d down the spectrum and given its nature it isnt helping
 
If you scroll down to the Wideband VLF youll see the interference signa= ture at 19KHz - yuck -  http://kl7uk=2Ecom/Alaska=2Ehtml
 
Still looking for you and praying it dries up at your end - lovely weat= her here though cold is a little biting holding the laptop and balancin= g the SDR IQ and probe/psu in my jacket pockets at -25C with 20 knots &= nbsp;:-)
 
Oh and HF LF and MF conditions are very poor of course =2E=2E=2E=2E
 
Laurence KL 1 X  we 2 xpq Wasilla AK

 
Date: Tue, 19 Mar 2013 22:02:23 +0100
From: uwe-jannsen@kabelmail=2Ede
To: rsgb_lf_group@blacksheep=2Eorg
Subject: Re: RE: LF: Decca 5501 mod, conditions, noise mitigation, 897= 0 et al;

thank= s Laurtence,

the WX here is not so pro VLF TXing: it snows and rains without interru= ption=2E

kill that cable amp=2E

GL
Uwe/dj8wx
Von: rsgb_lf_group@blacksheep=2Eorg
Gesendet: 18=2E03=2E2013 17:22
An: rsgb_lf_group@blacksheep=2Eorg
Betreff: RE: LF: Decca 5501 mod, conditions, noise mitigation, 8970 et= al;

Grabber on line Uwe - we have some qrm from a local ca= ble company which Im working on - looks like one of the Cable amps up t= he road is oscillating at 19KHz - ouch - look at my wideband snapper an= d youll see what I mean - 40dBm

- but it looks clear on 8970 - running now 238uHz Bucket bin - dang VLF= reference station keeps on going off and GPS twinking up here with all= this Aurorally stuff=2E=2E=2E=2E

We are now at 12 day 12 hours night increasing at 5 mins 46 secs per da= y=2E=2E=2E=2E=2Ebut still -28C last night

Laurence KL 1 X



Date: Mon, 18 Mar 2013 14:18:53 +0100
From: uwe-jannsen@kabelmail=2Ede
To: rsgb_lf_group@blacksheep=2Eorg
Subject: Re: LF: Decca 5501 mod, conditions, noise mitigation, 8970 et= al;

Hi  Laurence,
last days I made some tests on 8970Hz, mode <= span>CASTLE, shift 0,002Hz transmitting the letter “= W” in 5000sec/dot=2E Pse see:
http://abelian=2Eorg/vlf/fbins=2Eshtml#p=3D1363442400&b=3D080&s= =3Dsp
the signs could be seen on all grabbers I know=2E<= /strong>
Now I changed the speed and the shift to 10000sec/dot and= 0,001Hz,
I`ll give the PA some coal extra=2E
 <VLF
<If anyone wants to spark up on 8970Hz again from Eu Im looking at s= low QRSS's and shoving the results out on the web site=2E
<The s/n noise is now vastly improved down there too using the E fie= ld L400B=2E
 pse, Laurence, let us have an other try=2E
GL
Uwe/dj8wx/jo43sv
Von: rsgb_lf_group@blacksheep=2Eorg
Gesendet: 02=2E03=2E2013 09:00
An: rsgb_lf_group@blacksheep=2Eorg
Betreff: LF: Decca 5501 mod, conditions, noise mitigation, 8970 et al;=

Decca 5501 mod -

I think I recall that the late G3AQC, maybe others  had a clever w= ay of installing mods allowing it to be "switched"  between 137 an= d 500 - if anyone has any details Id like to hear or see them - with th= anks=2E

Conditions -

Well - its been a very poor LF season up here to date - with only a cou= ple of Eu openings, obviously my stars havent been aligned, or moreover= the Coronal holes have been=2E  At least the nights are getting s= horter

 - HF conditions are very poor too at this time=2E Still its good = X country skiing weather and the Aurora are pretty=2E

VLF

If anyone wants to spark up on 8970Hz again from Eu Im looking at slow = QRSS's and shoving the results out on the web site=2E

 The s/n noise is now vastly improved down there too using the E f= ield L400B=2E

QRM

I spent yesterday after noon with our local power utility linesman trac= king down a noise source(s) pulsing away at 9Khz prf from 50kHz to 5MHz= - traced one to a house about 0=2E4 miles from here, and I have a seco= nd one with the same sort of signature which is proving more difficult = to DF=2E  I havent approached the owners yet, but heck sitting out= side the offenders house on the road in the car with the SDRIQ and anot= her L400B magmount the pulses were stronger than local NDB and some MW = broadcast signals and a huge amount being re radiated from the undergro= und power lines - so you can imagine something fairly meaty shoving out= this do doo, especially as I can hear the same signatures (but maybe n= ot the same source) on overhead HT power lines some 5 miles away - Im g= uessing home automation, but it might be a wayward lighting switch or b= lender :-) =2E If your interested theres a visual capture of the interf= erence source covering the MF band at

http://k= l7uk=2Ecom/Screen7=2Epng

or on WSPR water fall   http://kl7uk=2Ecom/MEA1=2Epng


Cheers





Laurence KL 1 X  WE2 XPQ
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