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Message-ID: <002701c642db$d1ebcb40$045bfea9@d4f8d8>
From: "Andy Talbot" <actalbot@southsurf.com>
To: <rsgb_lf_group@blacksheep.org>
References: <030820061539.18005.440EFA980004BD4A0000465522007613940B97010D0A020E06979D0E03@comcast.net> <01dd01c642d8$e6cbc180$0300a8c0@LAPTOP>
Date: Wed, 8 Mar 2006 18:12:10 -0000
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Subject: LF: Re: Real QRP tests
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Status: O

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
>
>
>
>
> --
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>
>


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