Return-Path: Received: from mtain-mj11.r1000.mx.aol.com (mtain-mj11.r1000.mail.aol.com [172.21.164.95]) by air-mb02.mail.aol.com (v129.4) with ESMTP id MAILINMB022-a1904c0296fe7; Sun, 30 May 2010 12:49:02 -0400 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mtain-mj11.r1000.mx.aol.com (Internet Inbound) with ESMTP id 3AE993800009D; Sun, 30 May 2010 12:48:56 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1OIlft-0005e6-Nz for rs_out_1@blacksheep.org; Sun, 30 May 2010 17:47:45 +0100 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1OIlft-0005dx-1B for rsgb_lf_group@blacksheep.org; Sun, 30 May 2010 17:47:45 +0100 Received: from fg-out-1718.google.com ([72.14.220.153]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1OIlfm-00018o-EJ for rsgb_lf_group@blacksheep.org; Sun, 30 May 2010 17:47:45 +0100 Received: by fg-out-1718.google.com with SMTP id 16so849105fgg.10 for ; Sun, 30 May 2010 09:47:30 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:received:received:in-reply-to :references:date:message-id:subject:from:to:content-type; bh=EeGQ+prngsB9W4DiVsbh9Du6DNKDHVaezeJD1qK2t9M=; b=nYf2FqvLOSVB/AaJGFZALXJLiYBrgsTbt0XTNzjlk7Z46RgF+GFf3z6KT4qXPlCxxh jVuqu167LibGvXoXIyaiU8eo90Sf5QKHJutP70vJdCuyHB2ERMYkK6aX5FrPHN3R4Sq+ 9o0hLuCujWMwHRz13FCf88YiBRX3tg/vnnfSo= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type; b=NZ70+nQYL/ojmm5ZmkMuaF+oIBb0/+SVfgD8vIQB3kAaB1TTRx9v5pFgiR/bN5bp1p hwkcOfepiMvSKUPd8rPAgZgTe85tx+0VqQsziiPOLAreIJKDzo6yaig1ux3gAnxLtOdc fXh+2xvoL4jNHr5O2xIIcrgrUOJHN7gTkTNQs= MIME-Version: 1.0 Received: by 10.102.15.17 with SMTP id 17mr1195146muo.134.1275238050129; Sun, 30 May 2010 09:47:30 -0700 (PDT) Received: by 10.204.58.204 with HTTP; Sun, 30 May 2010 09:47:30 -0700 (PDT) In-Reply-To: <168948.62774.qm@web28102.mail.ukl.yahoo.com> References: <001701caff80$4d00df40$0401a8c0@xphd97xgq27nyf> <168948.62774.qm@web28102.mail.ukl.yahoo.com> Date: Sun, 30 May 2010 17:47:30 +0100 Message-ID: From: Roger Lapthorn To: rsgb_lf_group@blacksheep.org DomainKey-Status: good (testing) X-Spam-Score: 0.1 (/) X-Spam-Report: autolearn=disabled,HTML_MESSAGE=0.001,HTML_TAG_EXIST_TBODY=0.126 Subject: Re: LF: Re: Re: VLF SIGS Content-Type: multipart/alternative; boundary=001636499f7bfb67e90487d27e52 X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.1 required=5.0 tests=HTML_MESSAGE, HTML_TAG_EXISTS_TBODY 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-SCOLL-AUTHENTICATION: mail_rly_antispam_dkim-d286.2 ; domain : gmail.com DKIM : pass x-aol-sid: 3039400c89b64c0296f8718f X-AOL-IP: 193.82.116.20 X-Mailer: Unknown (No Version) --001636499f7bfb67e90487d27e52 Content-Type: text/plain; charset=ISO-8859-1 What power, antenna and matching for the 1km with the sig gen TX Pete? 73s Roger G3XBM On 30 May 2010 11:39, M0FMT wrote: > Hi All > > Simply use your PC sound card as an RX with the very good SDR application > from Alberto Winrad. Stuff your antenna into the mic socket. Preferably with > a couple of fast recovery diodes back to back to limit the spikes from > static build up. Don't recommend it when lightning is about. Never lost a > sound card yet ..... to stall the knockers............ > > If you have a modern PC it will have a Hi Def card giving a band width of > 196kc/s if you set the LO on the sdr application to 0.000.000 the readout > will direct in kc/s. Set you input in the drop down menu to either left or > right hand channel or better still both channels added and the display will > start at zero Hz or kc/s. The play on at about 19kc/s you see large humps of > signals extending up to about 23 or so kc/s these are Mil transmissions and > the like. They un-decryptable by the average punter but they come and go. > The Alphas are interesting as the operate up to about 10kc/s from memory and > are short pulses with one second intervals roughly > > 17.2 kc/s is worth moitoring because this is the frequency on which SAQ > Grimeton Sweden operates in plain language CW (Google it). It is a motor > generator set that produces the 17.2kc/s signal no valves or sparks just a > 200kw high frequency alternator fed into a massive antenna system. It comes > on when advertised usually Christmas Eve and other time during the year Lars > will e-mail you the schedual if you ask him. > > Very receivable with the set up descibed above with a short piece of wire > as an antenna. Very long wires can be self defeating. > > Oh my best dx from my home 8.9kc/s setup ... a sign genny into the antenna > is about 1km using above set up. Have tried a tuned circuit in front of the > sound card 600mm diam air cored joby with little improvement. > > Good luck to all who try out VLF RX. > > > 73 es GL petefmt > > I support www.NotSpotTelecom.Com your community Telco / ISP. > > --- On *Sat, 29/5/10, mal hamilton * wrote: > > > From: mal hamilton > Subject: LF: Re: Re: VLF SIGS > > To: rsgb_lf_group@blacksheep.org > Date: Saturday, 29 May, 2010, 23:43 > > > Jim > The frequencies I quoted have a 750 hz offset that is why I said not > calibrated, just a rough reception guide around the frequency area of > interest. > The signals are all very loud with me. I can accurately calibrate when > necessary. > Not sure if it is a good idea to connect my antennas directly to the > soundcard, maybe via an attenuator for front end control. I also have a W & > G 220 hz - 20 khz RX which is very sensitive but wideband and would be a > better approach if I feed this into the sound card. I have a number of > options available here I just need a beacon on 9 kcs > de mal/g3kev > > ----- Original Message ----- > From: "James Moritz" > > > To: > > > Sent: Saturday, May 29, 2010 8:35 PM > Subject: LF: Re: VLF SIGS > > > > Dear Mal, LF Group, > > > > Everyone can receive those signals in the UK, even with fairly poor > > receiving conditions (actually copying the traffic would be another > matter - > > I wouldn't go there ;-)). Most are quite strong, and in a different > octave > > of the spectrum from amateur activity, so not really a good receive > > performance check - rather like using BBC R4 on 198kHz as a test for > 136kHz > > reception performance. But the frequencies you list are a long way out, a > > few hundred hertz low. There is spectrum display at > > http://abelian.org/vlf/spectrum.shtml with station IDs and accurate > > frequency calibration. Bear in mind that you do need to be able to set > the > > RX frequency within a hertz or less, and have much less drift than that, > for > > the kind of DX tests that have been done recently. Better in that case to > > dispense with the converter and RX, and just feed the signals direct into > a > > PC sound card - frequency errors will be much smaller, and if you are > using > > a reasonably large antenna, you probably won't even need a preamp. > > > > Cheers, Jim Moritz > > 73 de M0BMU > > > > > > ----- Original Message ----- > > From: "mal hamilton" > > > > To: > > > > Sent: Saturday, May 29, 2010 7:31 PM > > Subject: LF: Re: VLF SIGS > > > > > > Does anyone else copy these signals? If not forget about VLF. > > g3kev > > > > ----- Original Message ----- > > From: mal hamilton > > To: rsgb > > Sent: Saturday, May 29, 2010 5:15 PM > > Subject: LF: VLF SIGS > > > > > > Not calibrated > > 16.2, 18.1, 19.4, 20.1, 20.7, 21.8, 23.1, 23.8 Khz > > All the above freqs active rtty type sigs and strong. > > nil hrd below 16.2 Khz at present > > No alpha sigs hrd today > > > > mal/g3kev > > > > > > > > > > > > -- http://g3xbm-qrp.blogspot.com/ http://www.g3xbm.co.uk http://www.youtube.com/user/g3xbm G3XBM GQRP 1678 ISWL G11088 --001636499f7bfb67e90487d27e52 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable What power, antenna and matching for the 1km with the sig gen TX Pete?
=
73s
Roger G3XBM

On 30 May 2010 11= :39, M0FMT <m0fm= t@yahoo.co.uk> wrote:
Hi All
=A0
Simply use your PC sound card as an RX with the very good SDR application from Alberto Winrad. Stuff your antenna into the mic soc= ket. Preferably with a couple of fast recovery diodes back to back to limi= t the spikes from static build up. Don't recommend it when lightning= is about. Never lost a sound card yet ..... to stall the knockers........= ....
=A0
If you have a modern PC it will have a Hi Def card givin= g a band width of 196kc/s if you set the LO on the sdr application to 0.00= 0.000 the readout will direct in kc/s. Set you input in the drop down menu= to either left or right hand channel or better still both channels added= and the display will start at zero Hz or kc/s. The play on at about 19kc/= s you see large humps of signals extending up to about 23 or so kc/s these= are Mil transmissions and the like. They un-decryptable by= the average punter but they come and go. The Alphas are interesting as th= e operate up to about 10kc/s from memory and are short pulses with one sec= ond intervals roughly
=A0
17.2 kc/s is worth moitoring because this is the frequency on which= SAQ Grimeton Sweden operates in plain language CW (Google it). It is a mo= tor generator set that produces the 17.2kc/s signal no valves or sparks ju= st a 200kw high frequency alternator fed into a massive antenna system.=A0= It comes on when advertised usually Christmas Eve and other time during th= e year Lars will e-mail you the schedual if you ask him.
=A0
Very receivable with the set up descibed above with a short piece of= wire as an antenna. Very long wires can be self defeating.
=A0
Oh my best dx from my home 8.9kc/s setup ... a sign genny into the an= tenna is about 1km using above set up. Have tried a tuned circuit in front= of the sound card 600mm diam air cored joby with little improvement.
=A0
Good luck to all who try out VLF RX.


73 es= GL petefmt

I support www.NotSpotTelecom.Com your community Telco / ISP.
<= br>
--- On Sat, 29/5/10, mal hamilton <g3kevmal@talktalk.net&g= t; wrote:

From: mal hamilton <g3kevmal@talktalk= .net>
Subject: LF: Re: Re: VLF SIGS

To: rsgb_lf_group@blacksh= eep.org
Date: Saturday, 29 May, 2010, 23:43


Jim
The frequencies I quoted have a 750 hz offset that is why I sa= id not
calibrated, just a rough reception guide around the frequency ar= ea of
interest.
The signals are all very loud with me. I can accurat= ely calibrate when
necessary.
Not sure if it is a good idea to connect my antennas directl= y to the
soundcard, maybe via an attenuator for front end control. I al= so have a W &
G 220 hz - 20 khz RX which is very sensitive but wide= band and would be a
better approach if I feed this into the sound card. I have a number of
= options available here I just need a beacon on 9 kcs
de mal/g3kev
----- Original Message -----
From: "James Moritz" <james.moritz@btopenworld.com>
To: <rsgb_lf_group@blacksheep.org&g= t;
Sent: Saturday, May 29, 2010 8:35 PM
Subject: LF: Re: VLF SIGS

> Dear Mal, LF Group,
>
> Everyone can receive those si= gnals in the UK, even with fairly poor
> receiving conditions (actua= lly copying the traffic would be another
matter -
> I wouldn'= t go there ;-)). Most are quite strong, and in a different octave
> of the spectrum from amateur activity, so not really a good receive> performance check - rather like using BBC R4 on 198kHz as a test fo= r
136kHz
> reception performance. But the frequencies you list ar= e a long way out, a
> few hundred hertz low. There is spectrum display at
> http://abelia= n.org/vlf/spectrum.shtml with station IDs and accurate
> frequency calibration. Bear in mind that you do need to= be able to set the
> RX frequency within a hertz or less, and have= much less drift than that,
for
> the kind of DX tests that have= been done recently. Better in that case to
> dispense with the converter and RX, and just feed the signals direct= into
a
> PC sound card - frequency errors will be much smaller,= and if you are
using
> a reasonably large antenna, you probably= won't even need a preamp.
>
> Cheers, Jim Moritz
> 73 de M0BMU
>
>
>= ; ----- Original Message -----
> From: "mal hamilton" <= g3kevmal@talktalk.net>
> To: <rsgb_lf_group@blacksheep.org<= /a>>
> Sent: Saturday, May 29, 2010 7:31 PM
> Subject: LF:= Re: VLF SIGS
>
>
> Does anyone else copy these signals? If not forget ab= out VLF.
> g3kev
>
>=A0=A0=A0----- Original Message ----= -
>=A0=A0=A0From: mal hamilton
>=A0=A0=A0To: rsgb
>=A0= =A0=A0Sent: Saturday, May 29, 2010 5:15 PM
>=A0=A0=A0Subject: LF: VLF SIGS
>
>
>=A0=A0=A0Not cal= ibrated
>=A0=A0=A016.2, 18.1, 19.4, 20.1, 20.7, 21.8, 23.1, 23.8 Khz=
>=A0=A0=A0All the above freqs active rtty type sigs and strong.
= >=A0=A0=A0nil hrd below 16.2 Khz at present
>=A0=A0=A0No alpha sigs hrd today
>
>=A0=A0=A0mal/g3kev
= >
>
>
>






--
http://g3xbm-qrp.blogspot.com/
http://www.g3xbm.co.uk
http://www.youtube.com/user/g3xbm
G3XBM =A0 =A0GQRP 1678 =A0 =A0 =A0ISWL G11088
--001636499f7bfb67e90487d27e52--