Sam,
Good info. One advantage of using the netbook PC and SDR receiver is that
noise signatures can be saved and archived on-the-fly. This is helpful when
identifying a reoccurring noise source. For example, three years ago, a
neighbor (a renter on the property) was using a microfridge to cool his
beer. It was a cheap Asian import model, purchased from Wal-Mart. It
produced an unusual, but repeating signature every 60 kHz. The noise went
away after I discussed the matter with the property owner. A few months
later, it was back. I compared signatures from the prior event and was
armed with evidence that clearly showed it was the same device -- or
another neighbor just happened to have purchased an identical microfridge!
Methodically documenting like this can really help when trying to convince a
neighbor (or the FCC if necessary) that the problem is real.
Paul, W9AC
----- Original Message -----
From: "Sam Morgan" <k5oai.sam@gmail.com>
To: <rfi@contesting.com>
Sent: Sunday, March 11, 2012 8:42 AM
Subject: Re: [RFI] Receiver settings for hearing RFI?
> On 3/11/2012 7:26 AM, Paul Christensen wrote:
>> It goes much faster if you can
>> see the entire band on a panadapter. Since the display is RF-sampled,
>> noise
>> is identified regardless of receive mode. I use an SDR-IQ receiver,
>> notebook PC, and tunable loop antenna. The netbook's battery is the
>> power
>> source for the SDR-IQ and active loop antenna.
> >
> If you are fortunate enough to own an Elecraft P3
> they can be used for this and are tunable to display
> any 200khz from 455 kHz up to 21.7 MHz
> power requirements are 10 to 15 VDC, 0.5 A maximum
>
> no external computer required
> just a sw radio to hear the noise and identify the frequency
> then set the P3 for that frequency and listen on your loop
> and you will see the offending signal
> as you get closer the variable gain will attenuate the signals
> etc etc
>
> --
> GB & 73
> K5OAI
> Sam Morgan
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