[RFI] 18-30 MHz RFI

[donovanf at starpower.net]

Kurt,

I haven't yet tried to correlate observations at the nursery to RFI at my QTH 1/2 mile away.  This RFI has been present for many years, fortunately my antennas are directive enough to minimize the problem except to the southwest.

My next step will be to use a radio and spectrum analyzer (Elecraft P3) in a vehicle to try to more accurately identify the source location.

If its commercial grow lighting as I suspect (using hundreds if not thousands of ballasts), it will be impossible to resolve the problem unless its isolated to just a few offending ballasts.

You can see the facility here:

http://maps.google.com/maps?q=39+16+59+n,+77+01+29+w&hl=en&sll=38.804821,-77.236966&sspn=3.373021,7.13562&t=h&z=17

73
Frank
W3LPL




---- Original message ----
>Date: Tue, 22 Jan 2013 11:43:25 -0800
>From: "KD7JYK DM09" <kd7jyk at earthlink.net>  
>Subject: Re: [RFI] 18-30 MHz RFI  
>To: "RFI Contesting" <RFI at contesting.com>
>
>"My suspicion (unconfirmed) is that the RFI might be generated by ballasts 
>used for commercial grow lights in their fifty large greenhouses."
>
>When they turn them on/off or change the configuration of the lamps, does 
>the sound change?  Ten lamps, lotta noise, turn off seven, lessa noise, 
>turna them all off, no noise?
>
>Kurt 
>
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