|[AMRadio] More Hash and Buzzies|
k4kyv at charter.net
Fri Mar 26 16:17:04 EDT 2010
The other day I posted a message that contained the following:
"Right now, I believe our greatest threat is not that the FCC might outlaw
or that commercial interests will take our HF bands away at the next WARC
(although we must always keep our eyes open for any such indications); our
greatest concern at the moment has to be the proliferation of cheap, poorly
designed consumer products and other technology that unnecessarily pollutes
the HF spectrum with buzzies and hash. Just a few examples include BPL, the
new digital/LED traffic signals, plasma TV's, touch lamps, HomePlug gadgets,
and whatever new product came on the market this morning to spew additional
trash in our bands"
If you were wondering what that new product might be, well, here it is.
This just came in off the RFI reflector.
Date: Thu, 25 Mar 2010 19:01:50 -0700
From: Dennis Vernacchia <n6ki73 at gmail.com>
Subject: [RFI] 40M RFI from Ooma VOIP phone hub - HELP!
To: SCCC Reflector <sccc at contesting.com>, sddxcnews at yahoogroups.com,
CQ-Contest <cq-contest at contesting.com>, rfi reflector
<RFI at contesting.com>
<265781b31003251901l166d3c93qd868c5fe12612cba at mail.gmail.com>
Content-Type: text/plain; charset=ISO-8859-1
*eHam.net Forum <http://www.eham.net/forums> :
RFI<http://www.eham.net/forums/RFI>: 40M RFI from Ooma VOIP phone hub
* *Forum Help* <http://www.eham.net/forums/help>
*1-1 of 1 messages*
* Page 1 of 1 *
*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
I've tried contacting Ooma, and they are stonewalling me. FCC Part 15 has no
limits for radiation under 30 MHz (thanks FCC). 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 at san.rr.com
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