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GARC-L  July 2008

GARC-L July 2008

Subject:

Hams solve mystery of malfunctioning car door remotes

From:

Jeff Capehart <[log in to unmask]>

Reply-To:

Jeff Capehart <[log in to unmask]>

Date:

Fri, 4 Jul 2008 23:44:20 -0400

Content-Type:

TEXT/PLAIN

Parts/Attachments:

Parts/Attachments

TEXT/PLAIN (106 lines)

Two stories of interest:

From the ARRL Letter:  Philadelphia Hams Nail Rogue Radio Signals
(see below)
       http://www.arrl.org/news/stories/2008/06/28/10183/?nc=1

From Network World:  When Networks Fail, Hams to the Rescue

       http://www.networkworld.com/news/2008/070308-ham-radio.html



----------
==> PHILADELPHIA AREA HAMS NAIL ROGUE RADIO SIGNALS

When residents of a Philadelphia suburb complained
<http://www.nbc10.com/investigators/16701097/detail.html?dl=mainclick>
to an area television station about how their remote car door entry
devices wouldn't work in the parking lot of a local department store, an
investigative reporter for NBC-10 (WCAU) called everyone she could to
help her discover why. No one knew anything -- until she called on some
local ham radio operators.

"Many people lock and unlock a car by remote and don't even give it a
second thought unless it doesn't work," said NBC10 reporter Lu Ann Cahn.
"The mystery problem repeatedly occurs outside the Kohl's store in
Royersford. When I went into Kohl's [to ask about this], they told me
they had no idea [about this]."

Cahn said that shoppers told her that this has been going on for more
than a year, and that some shoppers don't realize they might have to
manually lock their doors: "One woman reported her laptop was stolen
from her car after she thought she had locked it."

Shoppers theorized that it was the local power plant causing the
interference, but Cahn said that officials at the plant said it wasn't
them. Others thought that cellular telephone towers might be the
culprit, but there are no cell towers in the area. "Police tell us that
they can't figure it out either," Cahn said.

So after calling numerous places to help her out with this mystery, Cahn
happened upon Reggie Leister, N3KAS, and Bob Rex, K3DBD, of the
Pottstown Area Amateur Radio Club <http://www.paarc.net/>; Rex is Vice
President of the club and Leister is the club's Public Information
Officer (PIO). And as hams do, they were quick to volunteer to help out.

Leister and Rex accompanied Cahn to the parking lot in question. Rex
built an antenna out of aluminum tubing and hooked it up to a spectrum
analyzer. "Somewhere in the vicinity of this parking lot," Leister said,
"there is a big source of radiation, some sort of signal." When Leister
aimed the antenna in the direction of the Kohl's store, he hit pay dirt.
"There are actually two signals there. It looks like [they're] coming
from the building," Rex said when he read the analyzer.

Leister and Rex moved in closer to the building and pinpointed that one
signal was coming from one set of doors, while the other signal emitted
from another set of doors. Rex, an engineer, said that the thing that
bothers him about this is that the signals "are running constantly."
When Cahn approached Kohl's management with their findings, she was told
that "they will look into it."

"The FCC licenses radio signals and these ham radio operators say the
fact that some signal is interfering with remote locks isn't good," Cahn
said in her report. Rex concurred, saying, "The FCC rules are pretty
clear on that. It might be something that's broken." Leister and Rex
agreed that the store security sensors located at each set of doors
might be the culprit.

Three days after Leister and Rex located the source of the interference,
remote car door lockers worked again. "Kohl's will only say that they're
working on it," Cahn said. "The FCC says it does sound like something
malfunctioned and they have had reports of similar incidents in New York
City and Tampa, Florida."

A few days after they found the signals, Leister explained that he and
Rex did not think the anti-shoplifting detectors were the problem: "What
we are guessing here is that they are probably connected to some kind of
device that triggers a security camera to come on if there is a breach.
Except instead of just sending out a quick 2-5 second (Part 15) blip,
these seem to be on continuously and exceeding the permissible signal
levels."

Cahn was quick to give on-air credit to the local hams who stepped up to
the plate and helped crack this mystery: "We here at NBC10 were so
curious as to why these remote car locks would just stop working, so we
thought we should really try to solve this mystery. I have to give kudos
to Reggie Leister and Bob Rex with the Pottstown Area Amateur Radio
Club. They were so great and so excited. You don't know how many people
we called -- police, Triple A, car dealerships -- we called so many
people trying to figure this out and nobody knew anything until we
talked to these ham radio operators. They were so wonderful and they
knew all about radio signals. They created their own gadgets to help us
figure this out. We really want to thank them for their help with this."

----

Don't forget story #2 -- a report on a New Hampshire Field Day

From Network World:  When Networks Fail, Hams to the Rescue

       http://www.networkworld.com/news/2008/070308-ham-radio.html

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