My comment to the original poster.
I had a new housing development go in near me and no RFI problems developed.
The power feeding the new development is all underground. Mine is not,
we have
power poles. I was worried but so far so good.
I would be optimistic, you will most likely have no problems...........
73,
Bob
K6UJ
On 5/9/16 11:00 AM, Patrick Greenlee wrote:
TEMPEST is THE word.
*TEMPEST*is aNational Security Agency
<https://en.wikipedia.org/wiki/National_Security_Agency>specification
and aNATO <https://en.wikipedia.org/wiki/NATO>certification^[1]
<https://en.wikipedia.org/wiki/Tempest_%28codename%29#cite_note-USAF140107011-1>
^[2]
<https://en.wikipedia.org/wiki/Tempest_%28codename%29#cite_note-NIA1981-2>
referring to spying on information systems through leaking emanations,
including unintentional radio or electrical signals, sounds, and
vibrations.^[3]
<https://en.wikipedia.org/wiki/Tempest_%28codename%29#cite_note-3>
TEMPEST covers both methods to spy upon others and also how to shield
equipment against such spying. The protection efforts are also known
as emission security (EMSEC), which is a subset ofcommunications
security
<https://en.wikipedia.org/wiki/Communications_security>(COMSEC).^[4]
<https://en.wikipedia.org/wiki/Tempest_%28codename%29#cite_note-4>
In the olden days before the big rocks cooled (late 60's early 70's)
we used to put an AM broadcast receiver tuned off station near a
computer and you could listen to it run a program. Nested loops were
interesting to hear. Without meeting TEMPEST standards a computer's OS
could be identified at a considerable distance and data could be
likewise deciphered. I was in the TEMPEST world in the 80's where
custom built IBM compatible PC's meeting TEMPEST requirements were not
high production items. Patrick NJ5G
On 5/9/2016 12:14 PM, Mike Fahmie via TowerTalk wrote:
Long ago, I was asked by a police officer friend to carry my portable
HF receiver by a building that they believed housed a stolen
mini-computer. They hoped that the character/rhythm of the RFI would
match that of another identical machine running the same OS. I did,
but did not hear the noise they were hoping for.
They were both disappointed and relieved since the next hurdle would
have been to establish the validity of the search since they didn't
have enough PC (probable cause) to obtain a warrant. This was back
in the days when, in California, warrant-less searches utilizing
sensors more sensitive than human senses (ie, drug sniffing dogs)
were at risk of being thrown out of court.-Mike-
From: jimlux <jimlux@earthlink.net>
To: Grant Saviers <grants2@pacbell.net>; Ray Benny
<rayn6vr@cableone.net>; rfi@contesting.com; towertalk@contesting.com
Sent: Monday, May 9, 2016 9:43 AM
Subject: Re: [TowerTalk] [Bulk] How far does RFI travel?
They are plenty interested in busting grow operations. It's more
about whether RFI is probable cause for a search warrant. It is not.
You could get the FCC to send them a letter, maybe, but RFI is not a
state law issue ( i think its good thing that federal law preempts
state and local for RF)
Sent via the Samsung Galaxy S®6 active, an AT&T 4G LTE
smartphone-------- Original message --------From: Grant Saviers
<grants2@pacbell.net> Date: 5/9/2016 7:32 AM (GMT-08:00) To: Ray
Benny <rayn6vr@cableone.net>, rfi@contesting.com,
towertalk@contesting.com Subject: Re: [TowerTalk] [Bulk] How far
does RFI travel?
One thing I noticed when driving around with a PC+ USB spectrum analyzer
to find a new QTH, was how much quieter neighborhoods with in ground
utilities were from those with the old "poles and pigs" distribution
systems. Another observation was that big HV transmission systems were
quieter than expected when a few hundred yards from them. My conclusion
is the buried systems shield and choke the rf, just as happens with
buried coax. IMO, much of the rf trash we hear is generated by bad
devices and then radiated from pole systems. 60 acres NW of me were
recently developed, 20 homes on 2 acre lots plus open space and
underground utilities and so far so good. A plasma TV SW from me is an
S4 problem, but I haven't tracked it down. Hopefully, the new
subdivison near you will be all buried.
Several local hams here are seriously affected S9+ all bands by large
grow lights for recreational substances that are clearly not FCC
compliant re radiated and conducted emissions. The distance can be
significant - 1/4 mile or more. Most are probably illegal but of no
interest to law enforcement given trends of the new laws. The FCC
either "doesn't have the resources" or "won't investigate where illegal
activity may be happening without law enforcement present". A perfect
Catch22. In the past, when growing was clearly illegal, law enforcement
used AM radios to find the grow sites.
Grant KZ1W
Redmond, WA
On 5/9/2016 0:21 AM, Ray Benny wrote:
body {height: 100%; color:#000000; font-size:12pt;
font-family:arial, helvetica, sans-serif;}This may seem a strange
question to ask and there maybe many answers, so I will try to be
specific as to what I am looking for.
A new subdivision is being built about 1/4 mile away, east and north
east, towards EU. The homes are custom build on 1 acre parcels. What
I am trying to find out: can I expect my noise level to go up as
more homes are built?
I spend a lot of time on 160m. I have a RX 4SQ and 2 wire beverage,
and I do hear a number of small RFI noises in a number of directions
from nearby homes in my rural area. Most of the time they do not
cause any long term problems. My thought is that when new housing
comes in, new and more electronic gadgets will be inside that can
generate more RFI.
I have done some RFI tracking, mostly electric fences and
leaking/defective power line hardware, but these sources are usually
very distinctive and usually easy to fine. Finding wall wart, LED,
etc RFI is harder to find, especially on someone else's property.
Another way to ask my questions: "Does this type of RFI noise
typically radiate more than several hundred feet"?
Any thoughts or experiences are welcome.
Tnx & 73,
Ray, N6VR
Chino Valley, AZ
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