[ADXA] noise issue - take 2

[k5cs]

Look at the pole feeding the chicken house.  How many transformers are 
hanging on that pole?  If one transformer, it's single phase.  If three 
transformers, it's three phase.

-Charles, K5CS


On 3/23/2026 7:39 PM, Randell Curtis, W5ZJ via ADXA wrote:
>
> One other possibility.
>
>
> The info that I'm going by:
>
> 1. It is not normal hash, but a hum.
>
> 2. It started with the additon of a chicken house.
>
>
> My question.
>
> Is the power feedin the chicken house single phase or 3 phase. If it 
> is single phase, does it have a single phase to 3 phase converter at 
> the chicken house. The 3 phase converter would probably be owned by 
> the customer. I ran this through AI and this is what I see! Check out 
> the info on harmonic distortion.
>
>
> Single-phase to 3-phase converters often cause issues on utility lines 
> due to high inrush currents, voltage imbalance, and harmonic 
> distortion. These issues lead to overheating motors, tripped breakers, 
> and poor performance, especially when using undersized converters or 
> when the converter is loaded with uneven, single-phase loads.
> www.facebook.comwww.facebook.com +4
> Common Issues and Causes
>
>   * Voltage Imbalance
>     <https://www.google.com/search?q=Voltage+Imbalance&rlz=1C1VDKB_enUS954US954&oq=single+phase+to+3+phase+power+converter+issus+w&gs_lcrp=EgZjaHJvbWUqCQgBECEYChigATIGCAAQRRg5MgkIARAhGAoYoAEyCQgCECEYChigATIJCAMQIRgKGKABMgcIBBAhGJ8FMgcIBRAhGJ8FMgcIBhAhGJ8FMgcIBxAhGI8CMgcICBAhGI8C0gEKMTcyMjNqMGoxNagCCLACAfEFHdymjvzSwIg&sourceid=chrome&ie=UTF-8&mstk=AUtExfAQKGoVlUACYbe5Wm433E_Z4E3fhi1LFxQnEsf0_8DYl_HSuJ4Qh91vzbGltDTz6zqsbRfEqjMR_nxPjBvvH_sfAJFDuQgQIdV63WDoXyrCOmRaF-woyQ4zWGXhxGIF1jGO15WOIoxr2XCSm1FCcjatWnGBNpHXu4QXr3IT8PtvUfsb7sVsZxr67vDP6Jfvmy9x34DQ4gliQJ4ri218yZg_lEcdal2LeE5rAKQhPA5PVrT2CkFhX7SYpEL2JdBySexADVy38rZDwZYFGRAt9-GZ&csui=3&ved=2ahUKEwi_5JrGpbeTAxXZmmoFHX5NKFkQgK4QegQIAxAB>: If
>     the output voltage is not balanced (not equal in all three
>     phases), it causes motor heating and reduced motor life, according
>     to www.powerlinephaseconverter.com this FAQs page. This is
>     frequently caused by using an undersized converter or adding too
>     many single-phase loads to the converter’s output.
>   * Harmonic Distortion
>     <https://www.google.com/search?q=Harmonic+Distortion&rlz=1C1VDKB_enUS954US954&oq=single+phase+to+3+phase+power+converter+issus+w&gs_lcrp=EgZjaHJvbWUqCQgBECEYChigATIGCAAQRRg5MgkIARAhGAoYoAEyCQgCECEYChigATIJCAMQIRgKGKABMgcIBBAhGJ8FMgcIBRAhGJ8FMgcIBhAhGJ8FMgcIBxAhGI8CMgcICBAhGI8C0gEKMTcyMjNqMGoxNagCCLACAfEFHdymjvzSwIg&sourceid=chrome&ie=UTF-8&mstk=AUtExfAQKGoVlUACYbe5Wm433E_Z4E3fhi1LFxQnEsf0_8DYl_HSuJ4Qh91vzbGltDTz6zqsbRfEqjMR_nxPjBvvH_sfAJFDuQgQIdV63WDoXyrCOmRaF-woyQ4zWGXhxGIF1jGO15WOIoxr2XCSm1FCcjatWnGBNpHXu4QXr3IT8PtvUfsb7sVsZxr67vDP6Jfvmy9x34DQ4gliQJ4ri218yZg_lEcdal2LeE5rAKQhPA5PVrT2CkFhX7SYpEL2JdBySexADVy38rZDwZYFGRAt9-GZ&csui=3&ved=2ahUKEwi_5JrGpbeTAxXZmmoFHX5NKFkQgK4QegQIAxAD>: Converters
>     can introduce harmonics onto the single-phase utility line,
>     affecting other devices and causing power quality issues, as
>     described in www.geya.net this article.
>
>
>
> On Mon, 23 Mar, 2026 at 3:46 PM, Jussi Eloranta via ADXA 
> <adxa at mailman.qth.net> wrote:
> To: 'adxa'
> Hi,
>
> Just recorded the 160m noise on the panadapter. I was expecting it to be
> wide and all over the place. However, see attached. Bog is beverage on
> ground (wideband resonant) and invL is my inverted L (narrow resonant;
> SWR only OK at the bottom of 160m). You can see that both spectra are
> surprisingly narrow. They have center around 1.840 MHz (FT8 160m
> frequency, of course!) and extend to the sides by about 100 KHz. I was
> initially looking at this with my inv L and thought that, OK, that must
> be just the antenna response I am seeing. But now that I see the same
> thing with the BOG, I am not so sure what to make of this. If I scan
> more to the AM band, it seems that it is clear over there but then going
> further down in frequency I find another similar spot that is noisy.
>
> So, is this power pole noise after all? And if not, what on earth could
> it be? It has the characteristic raspy tone with multiples of 60 Hz in
> it. On AM it sounds like the typical power line hum. All that fit power
> pole noise but the spectrum does not - I think. Furthermore, I do not
> hear this noise at all on 80m. This is not from my shack as I have
> turned off power and used the radio on battery power. I do hear
> something weak on 6m from far away but I have no idea if this is the
> same thing as what I see on 160m.
>
> Jussi (aa6kj)
>
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