[RFI] RFI in the news
w5jr.mike at gmail.com
Fri Dec 6 19:14:54 EST 2013
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 horizon.
Mike / W5JR
> On Dec 6, 2013, at 4:26 PM, "EDWARDS, EDDIE J" <eedwards at 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 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.
> 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
>> Anthony (N2KI)
>> On Thu, Dec 5, 2013 at 12:48 PM, Charles Coldwell <coldwell at gmail.com>wrote:
>>> Charles M. Coldwell, W1CMC
>>> Belmont, Massachusetts, New England
>>> "Turn on, log in, tune out"
>>> RFI mailing list
>>> RFI at contesting.com
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