X-GM-THRID: 1211252742720040667 X-Gmail-Labels: rsgb lf X-Gmail-Received: 489c0750056355ba2ac3c1c0d1455c7dd134d2e1 Delivered-To: daveyxm@gmail.com Received: by 10.64.249.16 with SMTP id w16cs107596qbh; Fri, 11 Aug 2006 02:01:10 -0700 (PDT) Received: by 10.48.48.15 with SMTP id v15mr3629158nfv; Fri, 11 Aug 2006 02:01:10 -0700 (PDT) Return-Path: Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mx.gmail.com with ESMTP id b1si969753nfe.2006.08.11.02.01.06; Fri, 11 Aug 2006 02:01:10 -0700 (PDT) Received-SPF: neutral (gmail.com: 193.82.116.20 is neither permitted nor denied by best guess record for domain of owner-rsgb_lf_group@blacksheep.org) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1GBSl6-0007UB-E0 for rs_out_1@blacksheep.org; Fri, 11 Aug 2006 09:52:48 +0100 Received: from [193.82.59.130] (helo=relay2.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1GBSl5-0007U2-MQ for rsgb_lf_group@blacksheep.org; Fri, 11 Aug 2006 09:52:47 +0100 Received: from bay0-omc1-s20.bay0.hotmail.com ([65.54.246.92]) by relay2.thorcom.net with esmtp (Exim 4.51) id 1GBSl1-0002VY-1p for rsgb_lf_group@blacksheep.org; Fri, 11 Aug 2006 09:52:47 +0100 Received: from BAY124-W9 ([207.46.11.172]) by bay0-omc1-s20.bay0.hotmail.com with Microsoft SMTPSVC(6.0.3790.1830); Fri, 11 Aug 2006 01:52:36 -0700 X-Originating-IP: [203.208.238.252] X-Originating-Email: [hellozerohellozero@hotmail.com] Message-ID: MIME-Version: 1.0 From: "Laurence KL1X" To: "Roelof Bakker" Date: Fri, 11 Aug 2006 00:52:36 -0800 X-OriginalArrivalTime: 11 Aug 2006 08:52:36.0055 (UTC) FILETIME=[7DE8C670:01C6BD23] X-Spam-Score: 2.3 (++) X-Spam-Report: autolearn=disabled,AWL=0.076,FORGED_HOTMAIL_RCVD=2.132,HTML_30_40=0.056,HTML_MESSAGE=0.001 Content-Type: multipart/alternative; boundary="_689c0935-9a32-4645-bea9-2caad3742600_" Subject: RE: LF: Re: 134.1Khz X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.5 required=5.0 tests=FORGED_HOTMAIL_RCVD,HTML_20_30, HTML_MESSAGE 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 Status: O X-Status: X-Keywords: X-UID: 4721 --_689c0935-9a32-4645-bea9-2caad3742600_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable roelof - that coupling was a 680nF not pf, my p's instead of n's - ! Well i= ts going to get used again this weekend as Ive just been told to stay here = till next Wednesday again (oh what a shame) - so Ill unpack the rx again an= d shove up the probe on the fishing pole from here in the 12th floor of the= hotel. Im going to try it on VLF into the sound card and use SDR/Spec and = see what I can hear. Wasnt so good last night lots of qrn and didnt hear/se= e the HBG time signal nor DCF39. That MSFSK signal on 54Khz (carrier) is pr= etty strong in the evenings so definitely East of here and maybe Canadian a= s Scott indicated. The signal on 133Khz is a local fluffy object with wings= and not datatrack (thanks for the clips chaps). Ive got the hotel electric= ian to remove the 2 x 7W flourescent tubes from my patio whilst Im here....= .they were flashing and causing noise, and the concierge has come up with a= nother length of 30mm diameter white pipe "with end caps" - quite some ser= vice from this hotel n'est pas. =20 I should be LF rx qrv from Wasilla Alaska from the 24th-28th August if Im = allowed to carry electronics onto the flight. Laurence OJ11 Singapore (still) > From: roelof@ndb.demon.nl> To: rsgb_lf_group@blacksheep.org> Date: Wed, 9= Aug 2006 18:19:41 +0200> Subject: LF: Re: 134.1Khz> > Hello Laurence,> > G= lad to hear the design is working fine. Though there are now more than 120 = > around, as far as I know, it is the first one in Asia!> > >> The only dif= ference to the original design is a slightly longer (cap) > >> aerial, add= ed another few cms there, and the inter-stage coupling > >> increased to 6= 80pF from 560pF, only because thats what they have and not > >> to improve = the LF side <<> > This value is not very critical, but it should be in the = order of > 100 nF > (0.1 =B5F) to achieve good VLF performance. 680 pF is a= little on the low > side, I guess.> > Adding a few cm length to the PCB an= tenna does not make much of a > difference.> Doubling the size gives only 3= dB(m) more signal. It has been designed to > prevent overload of the recei= ver, but again nothing critical.> > I am following your endeavers with grea= t interest.> > Best regards,> > Roelof Bakker, pa0rdt> > > >=20 _________________________________________________________________ Try Live.com - your fast, personalized homepage with all the things you car= e about in one place. http://www.live.com/getstarted= --_689c0935-9a32-4645-bea9-2caad3742600_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable =0A= =0A= =0A= =0A= roelof - that coupling was a 680nF not pf, my p's instead of n's - ! = Well its going to get used again this weekend as Ive just been told to stay= here till next Wednesday again (oh what a shame) - so Ill unpack the rx ag= ain and shove up the probe on the fishing pole from here in the 12th floor = of the hotel. Im going to try it on VLF into the sound card and use SDR/Spe= c and see what I can hear. Wasnt so good last night lots of qrn and didnt h= ear/see the HBG time signal nor DCF39. That MSFSK signal on 54Khz (carrier)= is pretty strong in the evenings so definitely East of here and maybe Cana= dian as Scott indicated. The signal on 133Khz is a local fluffy object with= wings and not datatrack (thanks for the clips chaps). Ive got the hotel el= ectrician to remove the 2 x 7W flourescent tubes from my patio whilst Im he= re.....they were flashing and causing noise, and the concierge has come up = with another length of 30mm diameter white pipe "with end caps" - &nbs= p;quite some service from this hotel n'est pas.
 
 I should be LF rx qrv from Wasilla Alaska from the 24th-28th August i= f Im allowed to carry electronics onto the flight.
Laurence OJ11 Singapore (still)






> From: roelof@ndb.demon.nl
> To: rsgb_lf_group@blacksheep.org
= > Date: Wed, 9 Aug 2006 18:19:41 +0200
> Subject: LF: Re: 134.1Khz=
>
> Hello Laurence,
>
> Glad to h= ear the design is working fine. Though t= here are now more than 120 
> around,&n= bsp;as far as I know, it is the fir= st one in Asia!
>
> >> The only=  difference to the  original design is&n= bsp;a slightly longer (cap) 
> >> aeri= al, added another few cms there,  and&nb= sp;the inter-stage coupling 
> >> increased=  to 680pF from 560pF, only because thats=  what they have and not 
> >>&nbs= p;to improve the LF side <<
>
>= This value is not very critical, but it=  should be in the order of > 100=  nF 
> (0.1 =B5F) to achieve good = VLF performance. 680 pF is a little on&n= bsp;the low 
> side, I guess.
>
> Ad= ding a few cm length to the PCB ant= enna does not make much of a 
> di= fference.
> Doubling the size gives only 3&n= bsp;dB(m) more signal. It has been designed&n= bsp;to 
> prevent overload of the receiver,&= nbsp;but again nothing critical.
>
> I am&= nbsp;following your endeavers with great interest.=
>
> Best regards,
>
> Roelof Bakker,&n= bsp;pa0rdt
>
>  
>
>


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