Return-Path: Received: from mtain-di11.r1000.mx.aol.com (mtain-di11.r1000.mx.aol.com [172.29.64.15]) by air-da02.mail.aol.com (v129.4) with ESMTP id MAILINDA024-86624c6934402cb; Mon, 16 Aug 2010 08:51:12 -0400 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mtain-di11.r1000.mx.aol.com (Internet Inbound) with ESMTP id 3762638000099; Mon, 16 Aug 2010 08:51:11 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1Okz8T-0003Ub-8G for rs_out_1@blacksheep.org; Mon, 16 Aug 2010 13:49:53 +0100 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1Okz8S-0003US-MH for rsgb_lf_group@blacksheep.org; Mon, 16 Aug 2010 13:49:52 +0100 Received: from mail-bw0-f43.google.com ([209.85.214.43]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1Okz8R-0007YO-KU for rsgb_lf_group@blacksheep.org; Mon, 16 Aug 2010 13:49:52 +0100 Received: by bwz16 with SMTP id 16so1634533bwz.16 for ; Mon, 16 Aug 2010 05:49:50 -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=bQ+ulkJEYHTY9UR8F66Su9qstG7LZE7Jw3v6WshvLu8=; b=ODBj6Ok/LAcbK83rpBYzwle+5D0gDN8wVHTXfzlt8/6lio6O+GzkIJHfmQxfVmBtMl iTV4mRqlGoizFbcmSxaVzCpOOOs+4gDA8oW7Y5MFqLNzjrloXWkFNDY0s1DnawyC+6bu 1SeYAGc/axhkIKizSdhtu46u4c4k2/Ks16qX0= 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=Kuow9WK8vHozTF5QxTPaR53FJNpYmiFURNl2GVJ6jqLVQnXZK55AoO63WOj2/pZHg5 nCTq636oUoBj+GB1kZwe/aZdiEEVDRkVVFF7rneWeBLTK7Pd2fsjJfNPmE7Jez7JfSJL ULOSy+K3NzWlrpIUSZWKH90q3D+FZfcEJHBeg= MIME-Version: 1.0 Received: by 10.204.6.75 with SMTP id 11mr3362849bky.95.1281962990678; Mon, 16 Aug 2010 05:49:50 -0700 (PDT) Received: by 10.204.202.71 with HTTP; Mon, 16 Aug 2010 05:49:50 -0700 (PDT) In-Reply-To: <001101cb3d30$f4584060$0401a8c0@xphd97xgq27nyf> References: <004d01cb3ca7$34621800$0401a8c0@xphd97xgq27nyf> <4C68B105.6070005@hifidelity.com> <000b01cb3d21$8edb6870$0301a8c0@your91hoehfy9g> <001101cb3d30$f4584060$0401a8c0@xphd97xgq27nyf> Date: Mon, 16 Aug 2010 13:49:50 +0100 Message-ID: From: Roger Lapthorn To: rsgb_lf_group@blacksheep.org DomainKey-Status: good (testing) X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,HTML_MESSAGE=0.001 Subject: Re: LF: prosound amp Content-Type: multipart/alternative; boundary=000e0cd1d124acb2a7048df04462 X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.8 required=5.0 tests=HTML_30_40,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 x-aol-global-disposition: G X-AOL-SCOLL-AUTHENTICATION: mail_rly_antispam_dkim-m223.1 ; domain : gmail.com DKIM : pass x-aol-sid: 3039ac1d400f4c69343e1305 X-AOL-IP: 193.82.116.20 X-AOL-SPF: domain : blacksheep.org SPF : none X-Mailer: Unknown (No Version) --000e0cd1d124acb2a7048df04462 Content-Type: text/plain; charset=ISO-8859-1 Mal, Re sub-9kHz, the general view is that a loop and preamp something like the M0BMU design reproduced on my sub-9kHz page of my website (see https://sites.google.com/site/g3xbmqrp/Home/10khz) is a good bet for receive, coupled with Spectran or Spectrum Lab or similar software running on a PC. Accurate calibration seems necessary to know where exactly to look. With the signal and noise levels likely, I suspect that CW will be difficult and that slow QRSS or DFCW will be needed to get useful radiated distances, as Stefan has already shown Mal. Still, with your big antenna and power you may prove everyone wrong and in a way I hope you do. Imagine hearing a DX signal on CW on 8.97kHz. 73s Roger G3XBM On 16 August 2010 11:51, mal hamilton wrote: > If and when I get going I shall be in CW QSO mode not Beacon. > The trouble I fear is being received. Most stations are not equipped with a > suitable antenna for this frequency band. > It would be interesting to hear from those that are listening around this > frequency what antennas and receivers are in use. > de mal/g3kev > > > > > ----- Original Message ----- > *From:* Roger Lapthorn > *To:* rsgb_lf_group@blacksheep.org > *Sent:* Monday, August 16, 2010 10:18 AM > *Subject:* Re: LF: prosound amp > > Mal, > > Have you applied for a sub-9kHz NoV? It would be a good idea to submit an > application if not. > > It sounds like you are thinking about how to get a decent strong signal out > across the UK and Europe. > > 73s > Roger G3XBM > > On 16 August 2010 10:01, mal hamilton wrote: > >> Tnxd Steve for info. They look solid enough, but I suppose that is no >> guarantee. There is no cct info but expect they use FETS >> 73 de mal/g3kev >> >> ----- Original Message ----- >> From: "Steve Dove" >> To: >> Sent: Monday, August 16, 2010 4:31 AM >> Subject: Re: LF: prosound amp >> >> >> > Hi Mal, >> > >> > Careful. I don't know this brand specifically (Maplin?) - >> > wrong continent - but many prosumer amplifiers such as these >> > are fairly liberal with what they call 'Watts', and don't >> > exactly say for how long they'll do those 'Watts'. In short, >> > not as many as you think, and for nowhere near as long as you >> > might want. >> > >> > 'Real' audio amplifiers (i.e. real watts forever) tend to be >> > expensive and from name brands in pro-audio world. >> > >> > 73 >> > >> > Steve >> > >> >> >> > > > -- > http://g3xbm-qrp.blogspot.com/ > http://www.g3xbm.co.uk > http://www.youtube.com/user/g3xbm > G3XBM GQRP 1678 ISWL G11088 > > -- http://g3xbm-qrp.blogspot.com/ http://www.g3xbm.co.uk http://www.youtube.com/user/g3xbm G3XBM GQRP 1678 ISWL G11088 --000e0cd1d124acb2a7048df04462 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Mal,

Re sub-9kHz, the general view is that a loop and preamp someth= ing like the M0BMU design reproduced on my sub-9kHz page of my website (se= e https://sites.google.com/site/g3xbmqrp/Home/10khz) is a good= bet for receive, coupled with Spectran or Spectrum Lab or similar softwar= e running on a PC. Accurate calibration seems necessary to know where exac= tly to look.

With the signal and noise levels likely, I suspect that CW will be dif= ficult and that slow QRSS or DFCW will be needed to get useful radiated di= stances, as Stefan has already shown Mal.

Still, with your big ante= nna and power you may prove everyone wrong and in a way I hope you do. Ima= gine hearing a DX signal on CW on 8.97kHz.

73s
Roger G3XBM


On 16 August 2010 11:51, mal hamilton= <g3kevmal@talktalk.net> wrote:
If and when I get going I shall be in= CW=A0QSO=20 mode not Beacon.
The trouble I fear is being received.= Most stations=20 are not equipped with a suitable antenna for this frequency band.
It would be interesting to hear from= those that are=20 listening around this frequency what antennas and receivers are in=20 use.
de mal/g3kev
=A0
=A0
=A0
----- Original Message -----
Sent:= Monday, August 16, 2010 10:18=20 AM
Subject: Re: LF: prosound amp

Mal,

Have you applied for a sub-9kHz NoV? It would= be a=20 good idea to submit an application if not.

It sounds like you ar= e=20 thinking about how to get a decent strong signal out across the UK and= =20 Europe.

73s
Roger G3XBM

On 16 August 2010 10:01, mal hamilton <g3kevmal@talktalk.net>=20 wrote:
Tnxd=20 Steve for info. They look solid enough, but I suppose that is=20 no
guarantee. There is no cct info but expect they use FETS
73= de=20 mal/g3kev

----- Original Message -----
From: "Steve Dove"= <dsp@hifidelit= y.com>
To: <rsgb_lf_group@blacksheep.org>
Sent: Monday, August 16, 2010 4:31 AM
Subject: Re: LF:=20 prosound amp


> Hi Mal,
>
> Careful. =A0I don= 't=20 know this brand specifically (Maplin?) =A0-
> wrong continent=20 =A0- =A0but many prosumer amplifiers such as these
> are fairly= =20 liberal with what they call 'Watts', =A0and don't
>= exactly say for=20 how long they'll do those 'Watts'. =A0In short,
> no= t as many as=20 you think, and for nowhere near as long as you
> might=20 want.
>
> 'Real' audio amplifiers (i.e. real watts= forever) tend=20 to be
> expensive and from name brands in pro-audio=20 world.
>
> =A0 =A0 =A0 =A0 =A0 73
>
>=20 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0=20 =A0Steve
>





--
http://g3xbm-qrp.blogspot.com/
http://www.g3xbm.co.uk
http://www= .youtube.com/user/g3xbm
G3XBM=A0=A0 GQRP=20 1678=A0=A0=A0 ISWL G11088



--
http://g3xbm-qrp.blogspot.com/<= br>http://www.g3xbm.c= o.uk
http://www= .youtube.com/user/g3xbm
G3XBM=A0=A0 GQRP 1678=A0=A0=A0 ISWL G11088<= br> --000e0cd1d124acb2a7048df04462--