[RFI] Help Identifying RFI

[JW]

Well, maybe one's ears have gone bad limiting one's ability to note the noise characteristics.

>From the SDR spectrum displays I've seen one CANNOT note whether the carrier is AC line modulated or not - just a pip showing on the screen..

Real definitive. I find an oscilloscope observing the AM detected output of the receiver in the time domain to be more useful. I even use LINE TRIGGER to verify it is AC line related.

Also, if you'll  note, wideband arcing AC line sources simply cause an SDR's baseline to rise across the entire viewing range and without actually LISTENING one cannot know if the SDR is showing anomalous overload indications or broandand impulse noise. . 

Give me a device I can use my ear with any day of the week .. ...

(How did we ever DF noise sources before SDR burst onto the scene? To me, many SDR aficionados are just looking for a 'mission' they can fill in this regard and have little to no other exposure to DF techniques.)

de Jim WB5WPA, 



      From: Jim Brown <jim at audiosystemsgroup.com>
 To: rfi at contesting.com 
 Sent: Monday, September 25, 2017 5:09 PM
 Subject: Re: [RFI] Help Identifying RFI
   
On 9/25/2017 6:56 AM, JW via RFI wrote:
> Massive overkill IMO to stress the need for an SDR to accomplish this task.

Not really -- any decent spectrum display can be a BIG help in chasing 
and identifying RFI.

73, Jim K9YC

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