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Re: [RFI] USB Spectrum Analyzer

To: rfi@contesting.com
Subject: Re: [RFI] USB Spectrum Analyzer
From: David Robbins <k1ttt@verizon.net>
Reply-to: k1ttt@arrl.net
Date: Thu, 25 Sep 2014 12:20:36 -0500 (CDT)
List-post: <rfi@contesting.com">mailto:rfi@contesting.com>
I have used the sdr-iq receiver (http://www.rfspace.com/RFSPACE/SDR-IQ.html) 
for rfi and analysis of grow lamp noise.  it only goes to about 190khz 
bandwidth but is quite usable and has a wide range of pre-amp and attenuator 
settings built in.  it also doesn't require any external power, just the usb 
power which makes it handy to use with a laptop.  see some of my spectrum 
screen shots at: 
http://wiki.k1ttt.net/(X(1)S(qfsrcu55xitt4n45g2sitifz))/2012%20Maintenance%20and%20Upgrade%20Blog.ashx#160mrfi
   (keep scrolling to the end of the page as some other stuff is intermixed).

 

 


Sep 25, 2014 01:09:54 PM, mstangelo@comcast.net wrote:

If you're interested in this Spectrum Analyzer you can check a review on 
Kenneth Wyatt's EDN Blog:



While interesting he prefered TTI or Rigol Spectrun Analysers.

Ken is an EMC Consultant who has excellent as well a practical application 
notes and reviews on the blog as well as his website:



Here is his report on a visit to ARRL Headquarters. Note that they discuss 
interference from the grow lights:



If you want to experiment with a USB Spectrum Analyzer I'd get one of these $20 
DVB-T USB receiver sticks:



and use it with the free evaluation version of Touchstone software:



The DVB-T doesn't cover HF, the rtl2832 starts at 24Mhx, but the price is right.

There is lot's of good information on Ken's site.

Mike N2MS







----- Original Message -----
From: Paul Christensen 
To: RFI Mailing List 

Sent: Thu, 25 Sep 2014 12:41:16 -0000 (UTC)
Subject: Re: [RFI] USB Spectrum Analyzer

Gary,

I think -110 dBm sensitivity is marginal for RFI detective work, especially 
while working with low gain loops when trying to localize switch-mode 
interference. Some of the loop preamps I've used produce much more 
gain/noise than signal. For the money, I would look at one of the new, 
compact SDR receivers that contain a basic spectrum analyzer function. 
These will measure a -140 dBm noise floor. Of course, you don't have the 
ability to change resolution bandwidth as one would have with a true 
spectrum analyzer but that's perfectly adequate for RFI work.

Paul, W9AC



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