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From: "Alan Melia" <alan.melia@btinternet.com>
To: <rsgb_lf_group@blacksheep.org>
References: <4BB13167.3080404@telus.net>, <4BBA4F6A.9840.F1BA72@mike.dennison.ntlworld.com>, <4BBACEA6.4060703@telus.net> <4BBCB626.30059.18824AC@mike.dennison.ntlworld.com>
Date: Wed, 7 Apr 2010 17:11:26 +0100
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Subject: Re: LF: VE7TIL Grabber and DCF39 Monitor back online
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Hi Scott I forgot to mention I guess you are using Spec lab.......have a
word with Jean- Pierre or Wolf because you can run split windows.......this
doesnt help if you have a limitation of an SSB filter though unless you have
a 3kHz one. :-))

Alan.

----- Original Message ----- 
From: "Mike Dennison" <mike.dennison@ntlworld.com>
To: <rsgb_lf_group@blacksheep.org>
Sent: Wednesday, April 07, 2010 4:43 PM
Subject: Re: LF: VE7TIL Grabber and DCF39 Monitor back online


> Scott,
>
> I do not have direct experience of running a grabber, but it seems to
> me that your main difficulty is that, even with a SSB bandwidth on
> your LF receiver, you cannot cover DCF39 and the Eu DX window at the
> same time.
>
> The window at 136.318kHz was chosen to facilitate transatlantic tests
> and two-way QSOs so that the west-east traffic around 137.777kHz did
> not clash with east-west traffic. As I recall, there were QRM issues
> in Canada or the USA which meant that this was optimum. I do not know
> whether these are still relevant.
>
> I suggest an alternative west-east DX window just below the QRSS3
> part of the band, ie around 137.650kHz. Provided this is not used for
> daytime transmissions when QRSS3 activity is expected, it should not
> cause QRM to other users. I would still suggest using the lower part
> of the band for skeds.
>
> This would enable you and others to add an Argo window that is within
> the receiver's passband, but avoids the need for Eu stations to QRM
> the 137.777 area in order to check reception on most grabbers.
>
> Does this help?
>
> What to other users of 137kHz think?
>
> Mike
> ====
>
>
>
> > If you or anyone can assist me in getting the equipment or expertise
> > to get this setup I can commit to have it operational from a low noise
> > site for the next DX season.
> >
> > I just welcomed my first child within the last year to the world so
> > time is limited but my passion for LF is GREAT ;-)
> >
> > 73 Scott
> >
> >
> >
> >
> >
> >
> > Mike Dennison wrote:
> > > OK, all understood. Thanks for considering the idea.
> > >
> > > 73 de Mike
> > > ========
> > >
> > >
> > >> Unfortunately as the main LF RX is tuned to allow reception of the
> > >> upper end of the band 137778ish and DCF39 the EU DX window is not
> > >> within my passband.
> > >>
> > >> I hope to have a SDR online sometime in the future which would
> > >> resolve this.
> > >>
> > >> 73,
> > >> Scott
> > >>
> > >>
> > >>
> > >>
> > >> Mike Dennison wrote:
> > >>
> > >>> This is good news, Scott. Is there any chance of one of your
> > >>> grabbers being tuned to the EU DX Tx window of 136.318kHz?
> > >>>
> > >>> Mike. G3XDV
> > >>> ==========
> > >>>
> > >>>
> > >>>
> > >>>> I'm pleased to report the noise problem has been resolved and
> > >>>> most of the renovations here are complete.  The 2200m grabber and
> > >>>> DCF39 monitor are back online.
> > >>>>
> > >>>> 73 Scott
> > >>>> VE7TIL
> > >>>> http://www3.telus.net/sthed/argo/
> > >>>>
> > >>>>
> > >>>>
> > >>>>
> > >>>>
> > >>>>
> > >>>>
> > >>>
> > >>>
> > >>>
> > >>>
> > >>
> > >
> > >
> > >
> > >
> > >
> >
> >
>
>
>