Hi Jim (and gang),
I should also mention the wireless router we are talking about is really
called a Residential Gateway.
The Xfinity Telephony Gateway provides four Ethernet connections for use as
thehub of your home/office Local Area Network (LAN). The Xfinity Telephony
Gatewayalso provides 802.11a/b/g/n/ac wireless connectivity for enhanced
mobility andversatility. In addition, the Xfinity Telephony Gateway
provides for up to two sepa-rate lines of telephone service and Digital
Enhanced Cordless Telecommunications(DECT) funtionality to allow using
cordless telphones within the home. The Tele-phony Gateway also offers
integrated MoCA 2.0 home networking providing Inter-net access and transfer
of multimedia content between devices over coaxial cablein the home.
Just FYI,
Don (wd8dsb)
On Thu, Feb 13, 2020 at 9:40 AM Don Kirk <wd8dsb@gmail.com> wrote:
> Hi Jim,
>
> Thanks, but I really wanted to know if others have noticed a 1 MHZ wide
> signal that has a white noise waterfall and spectrum plot (both RF and
> Audio) from the Wireless Router I mentioned centered around 21 MHz. The
> main reason I asked this question is that it took us a couple of days to
> track down the source because at times we had conflicting bearings from our
> numerous direction finding antennas and I now suspect we ran across similar
> signals originating from other homes in a pretty densely populated
> neighborhood.
>
> This case made me introduce a new portable direction finding antenna to my
> toolkit for HF which turned out to be a life saver. I have a lot of
> experience with small terminated flags and pennants on 160 meters, and this
> gave me the idea to design and build a very small portable terminated flag
> that I designed to have a cardioid pattern all the way up to at least 30
> MHz, and this antenna was a great help due to its unidirectional
> properties. Used this portable flag (2 foot x 4 foot) with a W7IUV preamp
> operating off a 9 volt battery and this system was invaluable. A big
> advantage of the terminated flag is that it's truly broadband versus the
> portable tuned loops we also used. Having the broadband antenna allowed us
> to easily see the 1 MHz signature of the signal. (where it rolled off,
> etc.).
>
> Please keep in mind that when we are dealing with a homeowner that’s also
> a stranger that’s not a ham we should try and be the least invasive and
> least time consuming as possible while still obtaining the end goal which
> is to eliminate the RFI we are experiencing. We got lucky that this
> particular homeowner immediately volunteered to shut off his breakers
> before we even asked him to do that until we found what circuit was
> generating the noise, and then he went into his master bedroom and started
> unplugging devices until the device generating the noise was located (Mike
> and I did not enter his home). He then mentioned he was going to go to
> xfinity on Monday anyway and would request a new wireless router. It also
> helped that this homeowner had some knowledge of who Mike was and he
> mentioned that he had gone to high school with Mikes son many years ago.
>
> As I already mentioned we indeed will have the home owner try a toroid
> choke (based on the 31 material) on his AC line cord as well as a
> traditional differential mode power line filter if new equipment from
> Xfinity does not solve the problem. If these methods don’t work then we
> will dig deeper (chokes on other cables entering and exiting the wireless
> router, etc.).
>
> On a side note, Mike (W9RE) is going to give the homeowner an extension
> cord wrapped on our 31 material toroid core to try on his existing router
> prior to this weekend since Mike as I'm sure you know is big contester and
> he sure would like to have his 15 meter noise reduced (or eliminated) for
> this weekends contest, but again we are not trying to be too over bearing
> on this homeowner since he has already been so cooperative.
>
> Will post an update in the near future.
>
> Thanks and 73,
> Don (wd8dsb)
>
>
>
>
> On Wed, Feb 12, 2020 at 9:39 PM Jim Brown <jim@audiosystemsgroup.com>
> wrote:
>
>> On 2/12/2020 6:18 PM, Don Kirk wrote:
>> > If the replacement router does not fix the problem then
>> > Mike will test a toroid core choke as well as a corcom type filter on
>> the
>> > wireless router power cord.
>>
>> It's ALWAYS a good idea to put a suitable ferrite choke on any wiring
>> connected to a noise source -- it's usually those wires that radiate the
>> noise. And that includes the AC line cord or DC power cable. For 15M,
>> I'd start with three turns on a medium-size #31 clamp-on, and I'd do the
>> same with any Ethernet cables.
>>
>> If you haven't already done so, I'd try to shift the network to WiFi, so
>> that the only cables are the power supplies, the cable between the modem
>> and the router, and the DSL or internet cable feeding the modem.
>>
>> Lots of detailed advice on my website in the piece about increasing
>> contest scores by killing noise. k9yc.com/publish.htm
>>
>> 73, Jim K9YC
>> _______________________________________________
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>> http://lists.contesting.com/mailman/listinfo/rfi
>>
>
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