Dennis Vernacchia wrote:
> *eHam.net Forum <http://www.eham.net/forums> :
> RFI<http://www.eham.net/forums/RFI>: 40M RFI from Ooma VOIP phone hub
> - HELP!
> * *Forum Help* <http://www.eham.net/forums/help>
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> *40M RFI from Ooma VOIP phone hub - HELP!*
> by KE6L <http://www.eham.net/user/profile/KE6L> on March 25, 2010
> <http://www.eham.net/forums/mailto/29?id=3239> Recently, I experienced RFI
> on 7.040 MHz. It sounded like a buzz saw, with many sidebands +/- 10 KHz.
> The signal was 20 dB over S9 on my FT-1000D. N6KI assisted me, and we chased
> the problem to a neighbor about a block away. It did not take long to
> isolate the source: An Ooma phone hub VOIP phone. People buy these for $250
> and get free phone calls over the net. It's just the hub - you plug a phone
> into it. You also plug it into your residential telephone wiring (after
> disconnecting from the local carrier), so you can use other jacks.
>
> I tested the unit, and it is always oscillating. Most of the energy radiates
> from the unit via the "wall" jack, which is what you use to access your
> house wiring system (just my luck - nice antenna). The oscillation frequency
> is stable. If you unplug the "wall" jack, problem is gone (will only radiate
> 2-3 feet).
>
> I've tried contacting Ooma, and they are stonewalling me. FCC Part 15 has no
> limits for radiation under 30 MHz (thanks FCC).
What happened to the "may not cause interference to any licensed service
which is in addition to the radiation levels?
73
Roger (K8RI)
> There is some language about
> ALL radiations being minimized, however. How do I get to Ooma engineering?
> They are selling thousands of these things, and they are the kiss of death
> for 40M CW. Anybody know who/where Ooma engineering is?
>
> For a picture of the FCC label and model number for this unit, please use
> this link: www.jenmat.com/ooma.jpg.
>
>
> Jeff KE6L jsloane1@san.rr.com
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