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Re: [RFI] RFI in the news

To: "rfi@contesting.com" <rfi@contesting.com>
Subject: Re: [RFI] RFI in the news
From: Alan NV8A <nv8a@charter.net>
Date: Sat, 07 Dec 2013 08:13:28 -0500
List-post: <rfi@contesting.com">mailto:rfi@contesting.com>
Especially when people have messed with (extended, rerouted, spliced) the coax in their homes and left everything leaking like a sieve,


Alan NV8A

On 12/06/13 07:14 pm, W5JR.Mike wrote:
This is the great "TV White Spaces" project. Once the channels above 21 are repurposed for more wireless broadband 
(known as "600 MHz" despite including a large chunk of 500 MHz) save for channel 37 (astronomical use) and channels in 
the "duplex gap", and the remaining UHF TV is "repacked" into channels 14-21 (and some upper VHF, 7-13), 
there likely won't be much, if any, "White Space" left.

And again, the traditional cable TV plant, while using DTV like signaling, 
still utilizes the same channel assignments as over the air broadcasts. So, 
more interaction between a wireless phone/tablet and a cable system is on the 

Mike / W5JR

On Dec 6, 2013, at 4:26 PM, "EDWARDS, EDDIE J"<eedwards@oppd.com>  wrote:

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@contesting.com] On Behalf Of W5JR.Mike
Sent: Thursday, December 05, 2013 10:09 PM
To: Anthony (N2KI)
Cc: rfi@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.

Mike / W5JR

On Dec 5, 2013, at 1:05 PM, "Anthony (N2KI)"<n2ki.ham@gmail.com>  wrote:

This also happens with Direct TV C31-700 box.  FYI


Anthony (N2KI)

On Thu, Dec 5, 2013 at 12:48 PM, Charles Coldwell<coldwell@gmail.com>wrote:

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