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Re: [RFI] Receiver settings for hearing RFI?

To: rfi@contesting.com
Subject: Re: [RFI] Receiver settings for hearing RFI?
From: Sam Morgan <k5oai.sam@gmail.com>
Date: Sun, 11 Mar 2012 08:11:18 -0500
List-post: <rfi@contesting.com">mailto:rfi@contesting.com>
ah, very good point Paul,
having a screen shot record would be a definite plus
you can also do snapshots of the P3's display
I often do it using the peak and freeze functions of the P3
but you DO have to have it attached to a computer for the capture


GB & 73
Sam Morgan

On 3/11/2012 7:56 AM, Paul Christensen wrote:
> 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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