[RFI] If you're ATT, you can do something about RFI...

[Jeff Blaine]

What happens if we have a case where AT&T is the culprit (via radiation into 
ham bands from the Uverse's utilization of POTS wiring) blanketing much of 
the lower HF bands?

73/jeff/ac0c
www.ac0c.com
alpha-charlie-zero-charlie

-----Original Message----- 
From: W5JR.Mike
Sent: Tuesday, October 29, 2013 2:23 AM
To: Dale
Cc: rfi at contesting.com
Subject: Re: [RFI] If you're ATT, you can do something about RFI...

Hi, Dale and others. Many of these new industrial high efficiency lighting 
systems are generating significant broadband noises from near 650 MHz to 
close to 900 MHz. They fall under Part 18. They impact many licensed radio 
services, including Public Safety, both uplink and downlink. Fortunately, 
two of the manufacturers have acknowledged the problem and engineered a fix 
and are replacing hardware. A few issues remain, but the process has been 
pretty good. Some large national retail stores changed out their lighting 
and changed it out again.

You can imagine how a building owner might react to getting a knock on the 
door letting them know their brand new (expensive) high efficiency lighting 
system is the source of interference to numerous licensed radios systems 
requiring them to disable it. The lighting often is either primary in 
building lighting or outdoor parking/security lighting. Not a good 
situation. Most owners are cooperative to seek a solution, a very small few 
are not.

Disclaimer, I do indeed work for AT&T (Mobility side) and interference 
ingress and egress is one of the areas I am involved with. It's amazing the 
amount of broken (faulty) electronics we encounter every day. It seems like 
an unlimited supply.

tnx
Mike / W5JR

> On Oct 29, 2013, at 12:45 AM, Dale <svetanoff at earthlink.net> wrote:
>
> Tom,
>
> I suspect that your post will generate several replies.  Mine is as 
> follows:
>
> 1.  Amateur radio is also a LICENSED service.  We CAN invoke the FCC, but 
> admittedly, it takes several more steps to get action than what AT&T had 
> to do in Houston.  It should be noted that 705 MHz DOES fall within the 
> range of controlled emissions for Part 15 devices, whereas 3.5 MHz does 
> not.
>
> 2.  This case seems to be pretty much like the situation hams face when a 
> neighbor has a plasma TV or touch lamp or battery charger that are 
> incidental radiators and cause grief to radio systems.  FCC may not do 
> anything about radiated interference on HF because of non-coverage under 
> Part 15, so you, the ham, then have the option of confronting the neighbor 
> directly about an offending device; the result is often similar to what 
> the defendant in this case is doing to AT&T.  The difference is, of 
> course, he'll probably lose.
>
> 3.  The one area in which FCC has gone to bat for hams has been with the 
> electric power companies when the interference can be shown to emanate 
> from distribution power lines and associated equipment.  I have had two 
> situations, one in IL and the other here in IA, in which the local power 
> company was very helpful and even quick in fixing severe RFI problems that 
> were affecting me.  I did not invoke FCC, but I think the power companies 
> were well aware of the sort of pressure or fines that can come from 
> amateur radio RFI complaints.
>
> 4.  The situation here is not related to power distribution problems, and 
> neither are plasma TV or other consumer garbage RFI sources, so I suspect 
> that the fact that the light fixtures are putting out big sigs on 705 MHz 
> is a huge help for AT&T in getting action.  Incidentally, it sure would be 
> interesting to learn just how devices made to operate at relatively low 
> frequencies can generate strong harmonics or spurs way up into the UHF 
> range.
>
> 73, Dale
> WA9ENA
>
>
>
>
>
>
> -----Original Message-----
>> From: K8TB <k8tb at bosscher.org>
>> Sent: Oct 28, 2013 3:26 PM
>> To: rfi at contesting.com
>> Subject: [RFI] If you're ATT, you can do something about RFI...
>>
>> Interesting read...
>>
>> "http://transition.fcc.gov/Daily_Releases/Daily_Business/2013/db1028/DA-13-2077A1.pdf"
>>
>> But if it is on 75 meters?
>>
>> Tom K8TB
>>
>>
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