02-22-2002, 12:15 PM #1
Equipment that interferes with 800mhz systems...pls read
Hopefully the Webteam will also pick this up for a "News Headline"
These devices will also interfere with and/or block the reception of other devices in the 800mhz band -- think Nextel, think more importantly Public Safety Trunked Radio Systems, even direct 800mhz channels that normally bypass the trunking system!
Same source I got this link from also indicated an Israeli company is now marketing an illegal device to block cell phone reception in movie theaters and other public occupancies -- essentially jams the cell phone frequencies. Which would also jam public safety 800mhz systems!
February 21, 2002
Warning on use of Flashing Cellular Antenna Displays
There are a variety of accessory antennas available for cellular telephones. One popular
antenna accessory includes a flashing light on the tip of the antenna. The antenna accessories
themselves are harmless, but the vendor-operated display devices used to demonstrate them can
cause interference to licensed radio services.
Flashing Cellular Antenna Display units are used to show what the accessory looks like
when it is activated. In the past year there has been an increase in the use of Flashing Cellular
Antenna Displays. These display units send radio signals through several accessory antennas to
make them flash. The radio signals from the Antenna Display units cause interference on
cellular frequency bands. This interference is harmful to cellular communications and poses a
threat to other services in near by frequency bands.
Devices that use radio frequency energy, such as these display units, require approval
from the FCC prior to marketing or use. FCC approved devices can be identified by a
permanently attached label stating compliance with FCC Part 15 requirements. At this time
there are no FCC approved Flashing Cellular Antenna Displays.
Vendors operating Flashing Cellular Antenna Displays are advised to turn off these
devices immediately. Operators of Flashing Cellular Antenna Displays are in violation of
Section 302 of the Communications Act of 1934, as amended, 47 U.S.C. § 302. These displays
are not FCC certified and exceed the permitted emission levels under part 15 of the
Commission’s Rules. The use, marketing or importation of these displays is a violation of the
Communications Act of 1934, as amended. The FCC is currently investigating over two dozen
cases of interference caused by these unapproved devices.
Parties in violation of these provisions may be subject to the penalties contained within
Sections 501-510 of the Communications Act, 47 U.S.C. §§ 501- 510. Fines for a first offense
can range as high as $10,000 for each violation or imprisonment for up to one year. The radio
equipment can also be seized and forfeited to the U.S. Government.
Enforcement Bureau contact Brett Greenwalt at (202) 418-1303.
Following is an email from the emerg-l email list (yes, it still exists on auto-pilot out in the ether of the internet
Subject: Fw: [incident-briefing-network] IMMEDIATE DISTRIBUTION:
COMMUNICATIONS - WARNING (FCC) - 21FEB02
The below item should be self explanatory.
Gunslinger's Second Law of SAR:
"Ignorance is far more costly than education and training."
----- Original Message -----
Sent: Thursday, 21 February, 2002 23:01
Subject: [incident-briefing-network] IMMEDIATE DISTRIBUTION:
COMMUNICATIONS - WARNING (FCC) - 21FEB02
> [Editors Note: Following the warning is a report that provides an actual
> example of the problem. This is a issue that potentially affects
> Response communications. As the writer suggests, please give this wide
> >From the FCC:
> Released: 02/21/2002. WARNING ON USE OF FLASHING CELLULAR ANTENNA
> DISPLAYS. (DA No. 02-401). EB. Contact: Brett Greenwalt at (202)
> 418-1303. News Media Contact: John Winston at (202) 418-7450
> I've encountered one of these already. All public safety and Nextel
> systems died in a steel building during a crowded electronics convention.
> I noticed my public safety radio was in Control Channel scan which lead me
> to check my Nextel that reported no signal. Both had worked fine the day
> before in the same building. Lucky for me, I had my Public Safety radio
> configured to beep when it goes to CC scan. Otherwise, I would have been
> a dead zone until I actually needed to communicate. The signal was wiped
> out in all of the building, about 100'x500' Florida State Troopers in
> room had no idea they had been out of radio service during this period.
> You really don't know until you need it.
> Thanks to the 800interference mailing list and a message a few weeks ago,
> had a hunch. I gathered everyone in person and gave them a BOLO for a
> display for lighted cellular antennas. We coordinated on a VHF channel
> (un-effected) many of us carried also. Within about 5 minutes, there
> about 10 of us in front of a table with one of these devices. The
> accessory vendor, now rather nervous, gladly disconnected it. All 800
> communication came back to normal. He promised to leave the device
> disconnected for the reminder of the show. We warned him about the legal
> problem with this device and the danger it causes, and he promised to
> into it. Now we have an official FCC notice to hand someone next time.
> Here are pictures of the offending devices:
> Also be aware that there are imported intentional 800 MHz jammers being
> in public buildings, like movie theaters. A Miami TV station did a
> pro-jammer demo on live TV at a movie theater. They thought it was a
> idea to jam everything in a crowded theater so cell phones wouldn't ring.
> If I remember right, they're made in Israel. Totally illegal in the US,
> but many are being imported anyway. Not often that you get to see an FCC
> violation on live TV. These devices may be even more dangerous to the
> public's safety by jamming Public Safety radios. They don't
> discriminate... everything on (at least) 800 MHz is jammed.
> I would suggest that everyone print out this Public Notice, keep it in
> notebook, and give it to the business owner when you see one of these
> devices. Especially be aware of this in retail situations... have your
> users check for signal at all of your major malls. For example, fire
> inspections should now include radio signal checks. In an emergency, the
> radios being able to work will be just as important as any other system
> you're there to inspect. Really want a jammer in your place of business?
> Be ready to lose your CO for interfering with life safety equipment.
> forward this e-mail to your Inspection division if you're on, or
> 800 MHz radios for Fire or Police. Explain to them how to tell when
> they've lost the control channel on their radios. Explain to them that
> means their firefighters are on their own, literally, in these areas.
> Sorry for the wide distribution, but I think this is an important issue
> could effect many of us.
> Ray J. Vaughan, MS, CBTE, CERT
> KD4BBM PG-7-15266
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