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Date: Tue, 2 Oct 2007 17:09:26 +0100
From: "Andy Talbot" <andy.g4jnt@googlemail.com>
To: rsgb_lf_group@blacksheep.org
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Subject: Re: LF: Local AM transmitter on PC output
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OK, Tnx.
Its definitely Fareham then,  the MF mast only 5.5km away, on the top
of a hill and visible from the A27, near the M27 Junction.  Wondered
what that mast was radiating.

At 5500m,  1kW ERP works out 2.6uW /m^2,  or 31.5mV/m here, so I'm not
too surprised its that strong.   Now to filter the soundcard output.
 On the output of the upconverter chip, at 1.3GHz, I was seeing strong
sidebands at 1.2MHz and at first thought they were a sprog.  But it
was just the upconverter doing its job!

Andy  G4JNT


On 02/10/2007, Tony Magon <tmagon@optusnet.com.au> wrote:
> Andy
>
> Virgin AM has a local transmitter at Fareham. Its only 1kw, but it puts
> in a very strong signal around the area. Have monitored it using a
> remote receiver at Gosport.
>
> Regards
>
> Tony VK2IC
>
> Andy Talbot wrote:
> > While testing an IQ upconverter chip, I discovered I've got several
> > tens of millivolts of Virgin AM on 1215kHz coming out of my PC's audio
> > output.  There is enough signal to see it on a frequency counter and
> > view the AM on a scope.
> >
> >
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