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)
Message-ID: <000701c642de$46eabe40$045bfea9@d4f8d8>
From: "Andy Talbot" <actalbot@southsurf.com>
To: <rsgb_lf_group@blacksheep.org>
References: <030820061539.18005.440EFA980004BD4A0000465522007613940B97010D0A020E06979D0E03@comcast.net> <01dd01c642d8$e6cbc180$0300a8c0@LAPTOP> <002701c642db$d1ebcb40$045bfea9@d4f8d8>
Date: Wed, 8 Mar 2006 18:29:46 -0000
Mime-Version: 1.0
Subject: LF: Re: Re: Real QRP tests continued
Content-Transfer-Encoding: 7bit
Content-Type: text/plain; charset=Windows-1252
Sender: owner-rsgb_lf_group@blacksheep.org
Precedence: bulk
Reply-To: rsgb_lf_group@blacksheep.org
Status: O

Ok -
Just resurrected the old linear 5W LF test transmitter so that will do if
necessary.  The synth trace is rock steady on a scope when compared with its
input reference signal, so no nasty internal PLL artefacts, and it does
generate what it says on the dial.  The synth has been used before to drive
a microwave beacon and it was happy with 24/7 operation for a few months

So ready when you are...

Any 1Hz step

Andy  G4JNT


----- Original Message -----
From: "Andy Talbot" <actalbot@southsurf.com>
To: <rsgb_lf_group@blacksheep.org>
Sent: Wednesday, March 08, 2006 6:12 PM
Subject: LF: Re: Real QRP tests


> Yes, I've now got a commercial synth that goes down to 100kHz in 1Hz steps
> which should solve your need for N/M Hz intervals.  It can supply up to
> 13dBm so putting that into my (-36dBi) gain antenna may be enough.  If
not,
> can always add a quickie amplifier module
>
> You can either have the carrier derived from Caesium (2 - 3 hours notice
> needed)
> or from GPS (30 minutes notice)
>
> Andy G4JNT
> www.scrbg.org/g4jnt/
>
>
> ----- Original Message -----
> From: "Peter Martinez" <peter.martinez@btinternet.com>
> To: <rsgb_lf_group@blacksheep.org>
> Sent: Wednesday, March 08, 2006 5:51 PM
> Subject: LF: Real QRP tests
>
>
> > >From G3PLX:
> >
> > If there's anyone within about 500km from me at 54N 3W (i.e. daytime
> surface
> > wave range) who could transmit a few micro-watts of very stable
> (preferably
> > GPS-derived) carrier on 136kHz,  I would like to run some tests with my
> new
> > GPS-locked reception scheme to see how low we can go and still detect
that
> > there's something there. It may take some time to detect the signal, but
> > with that sort of low power there shouldn't be too much problem with
> leaving
> > the transmitter on for a day. A quick calculation says that 25mA r.m.s.
of
> > antenna current into an average antenna should produce plenty enough
> signal.
> > That's only 150v rms or so, depending on the antenna.  The more stable
is
> > the signal, the lower down I should be able to detect it.
> >
> > Any one for QRPP?
> >
> > 73
> > Peter G3PLX
> >
> >
> >
> >
> > --
> > No virus found in this incoming message.
> > Checked by AVG Free Edition.
> > Version: 7.1.375 / Virus Database: 268.2.0/276 - Release Date:
2006-03-07
> >
> >
>
>
>
> --
> No virus found in this outgoing message.
> Checked by AVG Free Edition.
> Version: 7.1.375 / Virus Database: 268.2.1/277 - Release Date: 2006-03-08
>
>
>
>
> --
> No virus found in this incoming message.
> Checked by AVG Free Edition.
> Version: 7.1.375 / Virus Database: 268.2.1/277 - Release Date: 2006-03-08
>
>


-- 
No virus found in this outgoing message.
Checked by AVG Free Edition.
Version: 7.1.375 / Virus Database: 268.2.1/277 - Release Date: 2006-03-08