Hi folks,
It may be worth looking at NW0W work. He uses rtl dongles to log noise
floor measurements from his car, and then plots the data as a heatmap layer
on a map.
I tried to find the blog entries on the phone, but I couldn't find the page
where there are pictures and system description.
Maybe that could be done in an easier way using a red pitaya.
73
Felipe PY1NB CT7ANO
Enviado pelo celular / sent from my mobile phone
On 12 Dec 2016 5:08 p.m., "Leigh Sedgwick" <bipi@comcast.net> wrote:
> I have used my SDRIQ with my MS Surface in the car. The SDRIQ is a nice
> compact box 4.5 in X 4 in X 1 in (W X D X H) powered by the USB port. I
> use
> Spectravue software and a National RF, Inc HFDF handheld loop.
>
> Mike
> K7PI
>
> -----Original Message-----
> From: RFI [mailto:rfi-bounces@contesting.com] On Behalf Of Frank N. Haas
> KB4T
> Sent: Monday, December 12, 2016 10:26
> To: Don Kirk <wd8dsb@gmail.com>
> Cc: rfi@contesting.com
> Subject: Re: [RFI] Using an SDR to locate RFI
>
> Exactly!
>
> On Dec 12, 2016 1:24 PM, "Don Kirk" <wd8dsb@gmail.com> wrote:
>
> > Hi Frank,
> >
> > You and I think exactly alike regarding not being interested in what
> > the source is when trying to track it down, but rather locating the
> > source first (what property it's emanating from), and then figuring
> > out what the source is.
> >
> > I just read your other posting, and I think what you are saying is
> > that you want an SDR setup that's convenient for mobile use. I don't
> > think you're saying the SDR technology does not display what you want,
> > but rather the hardware is cumbersome from a mobile setup? Is this
> correct?
> >
> > Don
> >
> > On Mon, Dec 12, 2016 at 1:14 PM, Frank N. Haas KB4T <
> > utility.rfi.pro@gmail.com> wrote:
> >
> >> Don:
> >>
> >> Most Power Line arcing as well as most other interference sources
> >> produce a consistent, non-sinusoidal or barely varying signal
> >> strength indication on the IC-7000. Clearly the hysteresis of the AGC
> >> circuits average the signal strength indication well. Yet the signal
> >> strength indication effectively rises and falls nicely in step with
> >> my approach and departure as I pass a true RFI source.
> >>
> >> The 7000 does not have a true spectrum scope like the 756Pro receivers.
> >> There is a spectrum scan feature but it is essentially useless for
> >> RFI location...in my opinion. I'm no so concerned with the frequency
> >> of the interference source's components. Instead I'm concerned with
> >> the frequencies affected by the source. There is a difference. I
> >> focus on locating the source, not what the source is composed of.
> >>
> >> 73,
> >>
> >> Frank N. Haas KB4T
> >> Utility Interference Investigator
> >> Florida
> >>
> >> On Mon, Dec 12, 2016 at 12:46 PM, Don Kirk <wd8dsb@gmail.com> wrote:
> >>
> >>> Rank,
> >>>
> >>> Another comment. It looks like the peaks are approximately every
> >>> 4000 hertz in your display which would make it look more like noise
> >>> from a variable speed drive or similar source, and not arcing on a
> >>> power line. If that's the case, then my SDR receiver as well as
> >>> analog HF rig definitely see the peaks and valleys of such
> interference.
> >>>
> >>> Don (wd8dsb)
> >>>
> >>> On Mon, Dec 12, 2016 at 12:38 PM, Don Kirk <wd8dsb@gmail.com> wrote:
> >>>
> >>>> HI Frank,
> >>>>
> >>>> One has to ask if the display you see on the IC-7000 is real? As
> >>>> an example, if it were real then as you tune the frequency up and
> >>>> down the band on the IC-7000 you should see peaks and valleys in
> >>>> the S meter reading, but that's not what I typically see when
> >>>> observing power line arcing (or light dimmer interference which
> >>>> mimics power line arcing quite well as it provides a transient
> >>>> during both the positive and negative portion of the sine wave). I
> >>>> typically just see a rise in the overall noise floor regardless of
> >>>> what frequency I'm on within a band both on my old Kenwood TS-180s
> >>>> analog HF rig, or on an SDR receiver (but next time I experience
> >>>> powerline noise I will be more observant, and I will simulate that
> tonight with a light dimmer I have at home).
> >>>>
> >>>> All of my experience is down on 160 meters, but suspect what I see
> >>>> down there would be similar on other bands????
> >>>>
> >>>> Maybe if you see peaks and valleys as you tune across the band we
> >>>> could theorize that more energy is effectively radiated by the
> >>>> power lines on frequencies where they are resonant, but I don't
> >>>> think that's the case based on how often the peaks and valleys are
> occurring on your display.
> >>>>
> >>>> What do you think about my above comments?
> >>>>
> >>>> P.S. you raise an interesting issue/topic that I will pay more
> >>>> attention to the next time I encounter power line arcing.
> >>>>
> >>>> Don (wd8dsb)
> >>>>
> >>>> On Mon, Dec 12, 2016 at 11:19 AM, Frank N. Haas KB4T <
> >>>> utility.rfi.pro@gmail.com> wrote:
> >>>>
> >>>>> For the last several months, I've been trying to use an SDRPlay
> >>>>> SDR Receiver with 3 different software packages as a tool for
> >>>>> locating arcing and other forms of interference to the HF and VHF
> >>>>> spectrum. I have virtually nothing to show for the effort.
> >>>>>
> >>>>> For over a decade, I've been using an ICOM IC-7000 mounted in my
> >>>>> work vehicle with a Hi-Q 4/80 HF screwdriver antenna, a VHF 3 dB
> >>>>> base loaded mobile antenna, a 5 dB center loaded UHF mobile
> >>>>> antenna and an antenna switch to effectively drive to within 1
> >>>>> pole or 1 structure of the source.
> >>>>> The system has served me well and made my (nearly daily)
> >>>>> interference location work efficient and easy.
> >>>>>
> >>>>> The IC-7000 is long in the tooth. While I enjoy cashing the Social
> >>>>> Security checks for the rig, I admit I'm spoiled by the enormously
> >>>>> informative spectral displays provided by SDRs. It's time to
> >>>>> retire the 7000 and install something new. The SDRs seem like the
> >>>>> perfect, reasonably priced solution. Yet the SDRs are so efficient
> >>>>> at masking noise that it's nearly impossible to use one as a
> >>>>> locating tool.
> >>>>>
> >>>>> But my experience is limited to the SDRPlay. I chose the SDRPlay
> >>>>> because of its frequency coverage. I've tried SDRUno, SDR Sharp
> >>>>> and HDSDR software packages. I've spent hours experimenting with
> >>>>> the configuration of each of these software options and have not
> >>>>> been able to find a setup that effectively, consistently and
> >>>>> clearly displays arcing interference.
> >>>>> What
> >>>>> I'm looking for is the type of display one sees on an ICOM
> >>>>> IC-756-II or -III spectrum display. Look me up on QRZ (KB4T) to
> >>>>> see a picture of what I seek.
> >>>>>
> >>>>> I've tried an Anritsu and an HP Spectrum Analyzer and they lack
> >>>>> the sensitivity or the mounting practicality to do what I want.
> >>>>>
> >>>>> There are many other SDRs out there. WinRadio, AirSpy and a boat
> >>>>> load of other makes and models. HAS ANYONE ACHIEVED ANY MEASURE OF
> >>>>> SUCCESS getting one of these smart boxes to provide a useful
> >>>>> spectral display of arcing interference? If so, please share with
> >>>>> this group!!!
> >>>>>
> >>>>> Thank you!
> >>>>>
> >>>>> Frank N. Haas KB4T
> >>>>> Utility Interference Investigator
> >>>>> Florida
> >>>>> _______________________________________________
> >>>>> RFI mailing list
> >>>>> RFI@contesting.com
> >>>>> http://lists.contesting.com/mailman/listinfo/rfi
> >>>>>
> >>>>
> >>>>
> >>>
> >>
> >>
> >> --
> >> Frank N. Haas KB4T
> >> Utility Interference Investigator
> >> Florida
> >>
> >>
> >>
> >
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