[RFI] RFI in the news

[EDWARDS, EDDIE J]

Speaking of cable TV systems, which is one of our main power line interference customers in town...  

I attended an IEEE meeting this week with a presentation on "Multicasting in Cognitive Radio Networks" by a PHD college professor from Iowa.  It was very good and pretty technical, and nearly over my head, but the presenter was basically describing a very efficient wireless mesh type data network system that would use the unused portions of the TV spectrum (since it would probably be unlicensed operation).  

When I asked if RF Interference issues were analyzed since there would be possible RFI to and/or from power lines and cable TV systems.  He gave me a deer-in-the-headlights look and said no such analysis had been done.  After the presentation, he approached me with some questions about possible RF interference, and he seemed amazed there could be such interference.  It clearly had not occurred to him.  

73, de ed -K0iL

-----Original Message-----
From: RFI [mailto:rfi-bounces at contesting.com] On Behalf Of W5JR.Mike
Sent: Thursday, December 05, 2013 10:09 PM
To: Anthony (N2KI)
Cc: rfi at contesting.com
Subject: Re: [RFI] RFI in the news

Traditional cable TV systems use the same spectrum above 470 MHz that over the air broadcast uses. And they are still using the spectrum between channels 52 and 69 that has been repurposed for Land Mobile, Public Safety and cellular. And the issue goes both ways. Leakage from cable plants are heard by 700 and 800 MHz base stations. 

tnx
Mike / W5JR

> On Dec 5, 2013, at 1:05 PM, "Anthony (N2KI)" <n2ki.ham at gmail.com> wrote:
> 
> This also happens with Direct TV C31-700 box.  FYI
> 
> 
> Regards,
> 
> Anthony (N2KI)
> 
> 
> 
> 
> 
> On Thu, Dec 5, 2013 at 12:48 PM, Charles Coldwell <coldwell at gmail.com>wrote:
> 
>> 
>> http://arstechnica.com/information-technology/2013/12/time-warner-cable-tv-goes-blurry-in-presence-of-verizon-lte-phones/
>> 
>> --
>> Charles M. Coldwell, W1CMC
>> Belmont, Massachusetts, New England
>> "Turn on, log in, tune out"
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